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Emergency and Acute Medicine: Thoracic Spine Injury
Thoracic spine injuries are typically the result of high-energy trauma, as the thoracic region is relatively rigid due to stabilization by the rib cage and costovertebral joints. Common mechanisms include axial compression, flexion–rotation, shear forces, flexion–distraction, and extension. Because of this rigidity, a large force is usually required to produce fractures or dislocations, most commonly seen in motor vehicle collisions, falls from significant heights, or high-impact trauma. The thoracic spinal canal is also relatively narrow, increasing the risk of neurologic injury when fractures occur—especially near the thoracolumbar junction (T11–L2), where a large proportion of spinal injuries are concentrated.
The stability of the thoracic spine is best understood using the three-column model. The anterior column includes the anterior vertebral body and supporting ligaments, the middle column consists of the posterior vertebral body and posterior longitudinal ligament, and the posterior column includes the vertebral arch and ligamentous structures. Injury involving two or more columns indicates instability, which significantly increases the risk of neurologic compromise.
Thoracic spine fractures are broadly categorized into minor and major injuries. Minor fractures include isolated spinous process, transverse process, or articular fractures, which are generally stable. Major injuries include compression fractures, burst fractures, seatbelt (flexion–distraction) injuries, and fracture-dislocations. Compression fractures typically involve the anterior column and may remain stable if the middle column is intact. In contrast, burst fractures involve the middle column and may result in retropulsion of bone fragments into the spinal canal, posing a risk of spinal cord compression. Flexion–distraction injuries, often associated with improper seatbelt use, disrupt posterior and middle columns, while fracture-dislocations represent complete failure of all three columns and are highly unstable with a high likelihood of neurologic injury.
Clinically, patients usually present with localized thoracic back pain, tenderness, bruising, or deformity, such as step-offs or widened interspinous spaces. Pain may also be referred to the chest or abdomen. Because of the force required to injure the thoracic spine, associated internal injuries should always be suspected, including thoracic, abdominal, or vascular trauma. Neurologic findings may include paresthesia, weakness, loss of reflexes, bowel or bladder dysfunction, or signs of spinal shock such as hypotension with bradycardia. The presence of injury at another spinal level should increase suspicion for thoracic involvement.
Evaluation begins with primary trauma assessment (ABCs) followed by a detailed neurologic and spinal examination, including rectal tone and perianal sensation. Any patient with midline tenderness, altered mental status, intoxication, distracting injuries, or significant mechanism of injury should undergo imaging. Initial imaging typically includes anteroposterior and lateral radiographs, but CT scanning is more sensitive and is often required for definitive assessment. CT is particularly useful for identifying fractures and evaluating stability, while MRI is indicated when there is concern for spinal cord injury, ligamentous damage, or neurologic deficits. Importantly, identification of a fracture in one region of the spine mandates imaging of the entire spine, as multiple injuries are not uncommon.
Management requires strict spinal immobilization throughout evaluation and resuscitation. Airway management should be performed with in-line stabilization, and hypotension should initially be assumed to result from hemorrhage until proven otherwise. Neurogenic shock, characterized by hypotension with bradycardia and warm extremities, should be distinguished from hypovolemic shock and may require vasopressor support in addition to fluid resuscitation.
Patients with suspected spinal cord injury or unstable fractures require urgent consultation with neurosurgical or orthopedic spine specialists and should be managed in a trauma center. Pain control with opioids, NSAIDs, and adjuncts is essential. The use of high-dose corticosteroids remains controversial and is no longer routinely recommended, though it may be considered in select cases within a limited time window after injury.
Admission is indicated for patients with unstable injuries, neurologic deficits, significant pain, ileus, or associated trauma. ICU care may be required depending on severity. Selected patients with stable minor fractures and no neurologic impairment may be discharged after specialist evaluation, with close outpatient follow-up.
Key pitfalls include failure to recognize thoracic spine injury in patients with major trauma, underuse of CT imaging in high-risk cases, and premature removal of spinal precautions. Maintaining immobilization until injury is definitively excluded, performing thorough neurologic assessments, and involving specialists early are critical steps in preventing missed injuries and improving patient outcomes.
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Emergency and Acute Medicine: Lumbar Spine Injury
Lumbar spine injuries result from significant mechanical forces applied to the lower back, most commonly due to blunt trauma such as motor vehicle accidents, falls from height, or direct impact. These injuries can involve a wide spectrum, ranging from stable compression fractures to highly unstable injuries with neurologic compromise. The type of injury depends on the mechanism involved, including flexion, compression, distraction, rotation, extension, or shear forces.
Flexion-compression injuries include wedge fractures, which are typically stable when less than 50% of the vertebral body height is lost and are not associated with ligamentous disruption or neurologic deficits. In contrast, burst fractures are more severe and involve retropulsion of bone fragments into the spinal canal, often causing kyphotic deformity and potential neurologic injury. Flexion-distraction injuries, such as the classic Chance fracture, are often associated with seatbelt injuries and may coexist with intra-abdominal trauma. More severe patterns like facet dislocations, rotational injuries, and translational (shear) injuries involve significant ligamentous disruption and are frequently unstable with a high risk of neurologic deficits. Less severe injuries include isolated spinous or transverse process fractures, which are generally stable but may occasionally involve nerve root irritation.
Patients typically present with midline lumbar pain, tenderness, bruising, deformity, or muscle spasm. Physical examination may reveal increased interspinous distance or a palpable step-off suggesting vertebral displacement. Neurologic deficits may occur depending on the level and severity of injury, including weakness, sensory loss, reflex abnormalities, or loss of bladder control. Pain may be masked in patients with multiple injuries or altered mental status, making imaging essential in these cases.
A detailed neurologic examination is crucial and should include assessment of motor strength, sensory levels, reflexes, rectal tone, and perineal sensation. Specific nerve root functions can help localize injury—for example, ankle dorsiflexion (L4–L5), toe extension (L5), and knee reflexes (L2–L4). Clinical suspicion should be high in patients with high-risk mechanisms, altered consciousness, intoxication, or distracting injuries.
Imaging plays a central role in diagnosis. Initial evaluation typically includes anteroposterior and lateral lumbar radiographs, but these may miss certain injuries, including up to 25% of burst fractures. Features suggesting instability include significant vertebral height loss (>50%), kyphosis, widening of interspinous distance, or vertebral translation. Therefore, CT scanning is often required for further characterization and assessment of spinal canal involvement, while MRI is indicated when there is concern for spinal cord or ligamentous injury.
Management begins with strict spinal immobilization and standard trauma resuscitation (ABCs). Patients with neurologic deficits or unstable fractures require urgent consultation with orthopedic spine or neurosurgical specialists. The use of high-dose corticosteroids such as methylprednisolone remains controversial and should be considered only in consultation with specialists.
Stable injuries in neurologically intact patients—such as minor compression fractures, isolated transverse or spinous process fractures, and some stable burst fractures—may be managed conservatively. Treatment includes pain control, activity modification, and sometimes bracing or orthotic support. Patients are advised to limit activities, avoid positions that worsen deformity, and follow structured recovery plans.
All patients with lumbar fractures generally require hospital admission for monitoring, pain management, and evaluation for associated injuries. However, selected patients with stable injuries and no neurologic deficits may be discharged with close follow-up, provided that imaging confirms stability and adequate support systems are in place.
Important pitfalls include missing unstable injuries on plain radiographs, underestimating injury severity in patients with distracting injuries, and failing to recognize alternative diagnoses such as infection, malignancy, or hematoma—especially in elderly or anticoagulated patients. Early imaging with CT, careful neurologic assessment, and specialist involvement are essential to optimize outcomes and prevent complications.
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Emergency and Acute Medicine: Coccyx Injury
Coccyx injury, commonly referred to as a tailbone injury, typically occurs after a fall in which the individual lands in a seated position, often from standing height. It may also occur during childbirth and is more frequently seen in women. These injuries are usually isolated and involve trauma to the distal end of the spine without associated neurologic compromise.
Patients typically present with localized pain and tenderness over the coccyx, often accompanied by bruising in the gluteal region. The pain is characteristically worsened by sitting—especially when leaning forward—and during defecation. A careful history should include the mechanism of injury and any preceding events that might explain the fall. On physical examination, focal tenderness is usually present, and a rectal exam may reveal pain or abnormal mobility of the coccyx. Importantly, neurologic deficits are not expected in isolated coccygeal injuries, and their presence should prompt evaluation for more serious spinal pathology.
Diagnosis is primarily clinical. Routine imaging is generally not necessary, as coccygeal fractures are difficult to interpret radiographically due to normal anatomical variations, and imaging exposes the gonads to unnecessary radiation. If imaging is required—such as when other spinal injuries are suspected—a lateral radiograph is the most useful view for identifying fractures or dislocations.
Management is conservative in most cases. Initial care focuses on pain control and exclusion of other injuries. In the emergency setting, analgesics are provided, and patients are advised on comfort measures. A key recommendation is the use of a donut-shaped cushion, which reduces pressure on the coccyx during sitting. Stool softeners are often prescribed to minimize pain during bowel movements.
Reduction of a displaced coccygeal fracture may be attempted in rare cases but is seldom necessary or successful. Most patients can be safely managed as outpatients, and hospital admission is rarely required unless there are associated injuries or complications.
Conditions that may mimic coccyx injury include coccygodynia, levator ani syndrome, pilonidal cyst, and perirectal abscess. A careful clinical evaluation helps distinguish these entities.
Overall, coccyx injuries are benign but can be quite painful. The mainstay of care is symptom management and patient education, with reassurance that most cases improve over time without the need for invasive intervention.
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Emergency and Acute Medicine: Pediatric Cervical Spine Injury
Pediatric cervical spine injury is relatively uncommon, occurring in only about 1–2% of children with severe blunt trauma, but it carries significant risk due to unique anatomical and biomechanical features. Younger children, particularly those under 8 years of age, are more prone to upper cervical spine injuries (C1–C3) because of a higher spinal fulcrum, proportionally larger head size, weaker neck musculature, ligamentous laxity, and immature vertebral structures. In contrast, older children tend to sustain lower cervical spine and more diffuse injuries, including vertebral fractures. Certain congenital or syndromic conditions—such as Down syndrome and other skeletal disorders—further increase susceptibility to instability and injury.
A distinct feature of pediatric trauma is spinal cord injury without radiographic abnormality (SCIWORA), which occurs more frequently in younger children. In this condition, children may present with clear neurologic deficits despite normal initial imaging. Symptoms may include spinal shock, weakness, or sensory disturbances, and importantly, these symptoms may be transient or delayed, sometimes appearing hours to days after the injury.
The most common causes of pediatric cervical spine injury vary with age. In neonates, birth-related trauma such as breech delivery may be responsible. In younger children, motor vehicle collisions and falls predominate, while in older children and adolescents, sports-related injuries become more common. Clinically, patients may present with neck pain, restricted range of motion, or neurologic deficits, although symptoms may be subtle or masked by altered mental status or distracting injuries. Abnormal vital signs such as hypotension, bradycardia, or respiratory compromise may indicate spinal cord involvement.
On examination, findings may include midline cervical tenderness, muscle spasm, and neurologic abnormalities such as paresthesias, weakness, flaccidity, or paralysis. Specific spinal cord syndromes may also be identified. For example, anterior cord syndrome results in motor paralysis with loss of pain sensation but preserved proprioception, while central cord syndrome typically causes greater weakness in the upper extremities than the lower. Brown-Séquard syndrome presents with asymmetric motor and sensory deficits. In preverbal children, assessment is particularly challenging, as they may not be able to communicate symptoms effectively.
Evaluation requires a cautious and systematic approach. Cervical spine radiographs are the initial imaging modality in children with concerning features such as pain, neurologic symptoms, altered consciousness, or significant mechanism of injury. Standard views include anteroposterior, lateral, and odontoid projections, ensuring visualization of all cervical levels. However, interpretation can be difficult due to normal developmental variants, such as pseudosubluxation of C2 on C3 or incomplete ossification of vertebral structures, which may mimic injury. CT scanning is indicated when radiographs are inconclusive or suspicious, while MRI is essential when spinal cord injury is suspected, particularly in cases of SCIWORA.
Clinical decision tools such as the NEXUS criteria may be applied in children older than 8 years, but are less reliable in younger patients. Therefore, a lower threshold for imaging is often necessary in younger children.
Management begins with strict cervical spine immobilization, using appropriately sized collars and supportive padding. Due to the relatively large head in young children, padding beneath the torso may be required to maintain neutral alignment and prevent neck flexion. During airway management, in-line stabilization must be maintained, and patients should be logrolled carefully. In sports injuries, helmets should generally be left in place unless they interfere with airway management.
In the emergency setting, any child with neurologic deficits or confirmed injury requires urgent neurosurgical or orthopedic consultation. The use of high-dose corticosteroids such as methylprednisolone remains controversial and should only be considered in consultation with specialists, given the risk of complications such as immunosuppression.
All children with altered mental status, neurologic deficits, or confirmed fractures should be admitted for monitoring and further management. Children with normal mental status, no imaging abnormalities, and no neurologic findings may be discharged with strict instructions. Importantly, caregivers must be educated about the possibility of delayed symptoms in SCIWORA, and advised to return immediately if the child develops weakness, numbness, or paralysis.
Key pitfalls include failure to recognize the unique anatomy of the pediatric cervical spine, misinterpreting normal variants as injuries or vice versa, and underestimating the potential for delayed neurologic deterioration. Maintaining immobilization throughout evaluation, using appropriate imaging, and ensuring close follow-up are essential to prevent missed injuries and improve outcomes.
Pediatric cervical spine injury is relatively uncommon, occurring in only about 1–2% of children with severe blunt trauma, but it carries significant risk due to unique anatomical and biomechanical features. Younger children, particularly those under 8 years of age, are more prone to upper cervical spine injuries (C1–C3) because of a higher spinal fulcrum, proportionally larger head size, weaker neck musculature, ligamentous laxity, and immature vertebral structures. In contrast, older children tend to sustain lower cervical spine and more diffuse injuries, including vertebral fractures. Certain congenital or syndromic conditions—such as Down syndrome and other skeletal disorders—further increase susceptibility to instability and injury.
A distinct feature of pediatric trauma is spinal cord injury without radiographic abnormality (SCIWORA), which occurs more frequently in younger children. In this condition, children may present with clear neurologic deficits despite normal initial imaging. Symptoms may include spinal shock, weakness, or sensory disturbances, and importantly, these symptoms may be transient or delayed, sometimes appearing hours to days after the injury.
The most common causes of pediatric cervical spine injury vary with age. In neonates, birth-related trauma such as breech delivery may be responsible. In younger children, motor vehicle collisions and falls predominate, while in older children and adolescents, sports-related injuries become more common. Clinically, patients may present with neck pain, restricted range of motion, or neurologic deficits, although symptoms may be subtle or masked by altered mental status or distracting injuries. Abnormal vital signs such as hypotension, bradycardia, or respiratory compromise may indicate spinal cord involvement.
On examination, findings may include midline cervical tenderness, muscle spasm, and neurologic abnormalities such as paresthesias, weakness, flaccidity, or paralysis. Specific spinal cord syndromes may also be identified. For example, anterior cord syndrome results in motor paralysis with loss of pain sensation but preserved proprioception, while central cord syndrome typically causes greater weakness in the upper extremities than the lower. Brown-Séquard syndrome presents with asymmetric motor and sensory deficits. In preverbal children, assessment is particularly challenging, as they may not be able to communicate symptoms effectively.
Evaluation requires a cautious and systematic approach. Cervical spine radiographs are the initial imaging modality in children with concerning features such as pain, neurologic symptoms, altered consciousness, or significant mechanism of injury. Standard views include anteroposterior, lateral, and odontoid projections, ensuring visualization of all cervical levels. However, interpretation can be difficult due to normal developmental variants, such as pseudosubluxation of C2 on C3 or incomplete ossification of vertebral structures, which may mimic injury. CT scanning is indicated when radiographs are inconclusive or suspicious, while MRI is essential when spinal cord injury is suspected, particularly in cases of SCIWORA.
Clinical decision tools such as the NEXUS criteria may be applied in children older than 8 years, but are less reliable in younger patients. Therefore, a lower threshold for imaging is often necessary in younger children.
Management begins with strict cervical spine immobilization, using appropriately sized collars and supportive padding. Due to the relatively large head in young children, padding beneath the torso may be required to maintain neutral alignment and prevent neck flexion. During airway management, in-line stabilization must be maintained, and patients should be logrolled carefully. In sports injuries, helmets should generally be left in place unless they interfere with airway management.
In the emergency setting, any child with neurologic deficits or confirmed injury requires urgent neurosurgical or orthopedic consultation. The use of high-dose corticosteroids such as methylprednisolone remains controversial and should only be considered in consultation with specialists, given the risk of complications such as immunosuppression.
All children with altered mental status, neurologic deficits, or confirmed fractures should be admitted for monitoring and further management. Children with normal mental status, no imaging abnormalities, and no neurologic findings may be discharged with strict instructions. Importantly, caregivers must be educated about the possibility of delayed symptoms in SCIWORA, and advised to return immediately if the child develops weakness, numbness, or paralysis.
Key pitfalls include failure to recognize the unique anatomy of the pediatric cervical spine, misinterpreting normal variants as injuries or vice versa, and underestimating the potential for delayed neurologic deterioration. Maintaining immobilization throughout evaluation, using appropriate imaging, and ensuring close follow-up are essential to prevent missed injuries and improve outcomes.
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Emergency and Acute Medicine – Small-Bowel Injury
Small-bowel injury is a serious and often underdiagnosed consequence of abdominal trauma, occurring from either blunt or penetrating mechanisms. Penetrating trauma frequently results in direct visceral injury such as perforation, transection, or mesenteric vascular damage, whereas blunt trauma causes injury through mechanisms like deceleration, compression against the spine, or sudden increases in intraluminal pressure. It is the third most commonly injured organ in blunt trauma and carries a mortality rate of up to 33%, particularly when diagnosis is delayed.
Blunt causes commonly include motor vehicle accidents, assaults, bicycle handlebar injuries, and blast injuries. Injury often occurs at fixed points such as the ligament of Treitz or ileocecal junction due to shearing forces. The presence of a “seatbelt sign” (abdominal wall bruising) significantly increases the risk. Penetrating trauma—especially gunshot wounds—frequently involves the small bowel and may result in severe injury. Associated injuries often include liver or splenic trauma and fractures of the thorax or pelvis.
Clinical presentation can be subtle and misleading early on. Many patients initially appear stable with mild symptoms but later deteriorate. Common findings include abdominal pain, tenderness, and peritoneal signs, though these may be absent initially. Other signs include abdominal wall bruising, hypotension, tachycardia, decreased urine output, or signs of intestinal obstruction. Delayed diagnosis dramatically increases mortality, from around 2% if diagnosed within 8 hours to over 30% after 24 hours.
Evaluation begins with a thorough trauma assessment. CT scanning is the primary imaging modality in stable patients, though it is less sensitive for hollow viscus injuries. Findings such as free intraperitoneal fluid without solid organ injury, bowel wall thickening, mesenteric streaking, or pneumoperitoneum raise suspicion. Ultrasound is not reliable for detecting bowel injury due to interference from bowel gas. In unstable patients, diagnostic peritoneal lavage (DPL) is useful for detecting intra-abdominal bleeding. Serial examinations are crucial, especially when initial imaging is inconclusive.
Differential diagnoses include solid organ injury, hemoperitoneum, gastrointestinal perforations, and ileus from vertebral injury. In children, diagnosis is often delayed, and clinicians must consider nonaccidental trauma when history is unclear.
Management follows advanced trauma life support principles. Immediate priorities include airway, breathing, and circulation stabilization with aggressive fluid resuscitation. Eviscerated bowel should be covered with moist sterile dressings, and impaled objects must not be removed in the emergency setting. Indications for urgent laparotomy include evisceration, hypotension with abdominal pain, positive imaging or DPL, gunshot wounds, or visible diaphragmatic herniation.
Stable patients without clear indications for surgery may undergo observation with serial abdominal examinations. Broad-spectrum antibiotics (e.g., cephalosporins with metronidazole) and tetanus prophylaxis should be administered in cases requiring surgical exploration or penetrating trauma.
All patients with suspected or confirmed small-bowel injury typically require hospital admission, especially those with pain, tenderness, or unreliable examination. Only patients with minimal trauma, normal examination, and reliable follow-up may be considered for discharge.
Key points include maintaining a high index of suspicion, recognizing that early symptoms may be mild, understanding the limitations of CT imaging, and relying on serial examinations to detect evolving injury.
Small-bowel injury is a serious and often underdiagnosed consequence of abdominal trauma, occurring from either blunt or penetrating mechanisms. Penetrating trauma frequently results in direct visceral injury such as perforation, transection, or mesenteric vascular damage, whereas blunt trauma causes injury through mechanisms like deceleration, compression against the spine, or sudden increases in intraluminal pressure. It is the third most commonly injured organ in blunt trauma and carries a mortality rate of up to 33%, particularly when diagnosis is delayed.
Blunt causes commonly include motor vehicle accidents, assaults, bicycle handlebar injuries, and blast injuries. Injury often occurs at fixed points such as the ligament of Treitz or ileocecal junction due to shearing forces. The presence of a “seatbelt sign” (abdominal wall bruising) significantly increases the risk. Penetrating trauma—especially gunshot wounds—frequently involves the small bowel and may result in severe injury. Associated injuries often include liver or splenic trauma and fractures of the thorax or pelvis.
Clinical presentation can be subtle and misleading early on. Many patients initially appear stable with mild symptoms but later deteriorate. Common findings include abdominal pain, tenderness, and peritoneal signs, though these may be absent initially. Other signs include abdominal wall bruising, hypotension, tachycardia, decreased urine output, or signs of intestinal obstruction. Delayed diagnosis dramatically increases mortality, from around 2% if diagnosed within 8 hours to over 30% after 24 hours.
Evaluation begins with a thorough trauma assessment. CT scanning is the primary imaging modality in stable patients, though it is less sensitive for hollow viscus injuries. Findings such as free intraperitoneal fluid without solid organ injury, bowel wall thickening, mesenteric streaking, or pneumoperitoneum raise suspicion. Ultrasound is not reliable for detecting bowel injury due to interference from bowel gas. In unstable patients, diagnostic peritoneal lavage (DPL) is useful for detecting intra-abdominal bleeding. Serial examinations are crucial, especially when initial imaging is inconclusive.
Differential diagnoses include solid organ injury, hemoperitoneum, gastrointestinal perforations, and ileus from vertebral injury. In children, diagnosis is often delayed, and clinicians must consider nonaccidental trauma when history is unclear.
Management follows advanced trauma life support principles. Immediate priorities include airway, breathing, and circulation stabilization with aggressive fluid resuscitation. Eviscerated bowel should be covered with moist sterile dressings, and impaled objects must not be removed in the emergency setting. Indications for urgent laparotomy include evisceration, hypotension with abdominal pain, positive imaging or DPL, gunshot wounds, or visible diaphragmatic herniation.
Stable patients without clear indications for surgery may undergo observation with serial abdominal examinations. Broad-spectrum antibiotics (e.g., cephalosporins with metronidazole) and tetanus prophylaxis should be administered in cases requiring surgical exploration or penetrating trauma.
All patients with suspected or confirmed small-bowel injury typically require hospital admission, especially those with pain, tenderness, or unreliable examination. Only patients with minimal trauma, normal examination, and reliable follow-up may be considered for discharge.
Key points include maintaining a high index of suspicion, recognizing that early symptoms may be mild, understanding the limitations of CT imaging, and relying on serial examinations to detect evolving injury.
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Emergency and Acute Medicine – Slipped Capital Femoral Epiphysis (SCFE)
Slipped capital femoral epiphysis (SCFE) is an orthopedic condition in which the femoral epiphysis slips posteriorly and inferiorly relative to the femoral neck through the growth plate. It is classified by severity based on the percentage of slip (mild <33%, moderate 33–50%, severe >50%), by duration (acute <3 weeks, chronic >3 weeks, or acute-on-chronic), and by stability (stable if the patient can bear weight, unstable if not). It most commonly affects adolescents, with peak incidence at 12–14 years in boys and 11–12 years in girls, and occurs more frequently in males. Bilateral involvement is common, occurring in up to 20% initially and progressing in many others. Atypical cases may be associated with endocrinopathies and have a higher risk of bilateral disease.
The condition arises due to increased shear forces across a weakened proximal femoral physis during adolescence. As the growth plate becomes more oblique, mechanical forces shift from compression to shear. Risk factors include obesity (most common), Down syndrome, and endocrine disorders such as hypothyroidism, growth hormone deficiency, and renal osteodystrophy.
Patients often present with vague, poorly localized pain in the hip, groin, thigh, or even the knee due to referred pain. Chronic cases typically have dull pain over weeks with a limp, while acute cases present with sudden severe pain, often after minor trauma. On examination, patients may have an externally rotated leg, limited internal rotation, abduction, and flexion of the hip. A key clinical sign is obligatory external rotation during passive hip flexion. Gait abnormalities may include an antalgic gait, Trendelenburg gait in moderate-to-severe cases, or a waddling gait if bilateral involvement is present.
Diagnosis is primarily made with imaging. Plain radiographs of both hips are essential, including anteroposterior and lateral views. Findings may include widening of the physis, a “slipped” appearance of the epiphysis, and the classic Klein line abnormality (a line along the superior femoral neck that fails to intersect the epiphysis). If diagnosis is unclear, labs such as CBC, ESR, CRP, and endocrine studies may help evaluate alternative diagnoses or underlying causes.
Differential diagnoses include Legg–Calvé–Perthes disease, septic arthritis, osteomyelitis, transient synovitis, fractures, and hernias. It is important to always examine the hip in children presenting with knee or thigh pain to avoid missing SCFE.
Management is urgent and focuses on preventing further slippage and complications. The patient must be made strictly non–weight-bearing, and the hip should be immobilized. No attempts at reduction should be made in the emergency setting due to the risk of avascular necrosis. Immediate orthopedic consultation is required, as definitive treatment is typically surgical fixation with a single cannulated screw.
All cases of SCFE require admission for orthopedic management, especially acute, unstable, or bilateral cases. There is no role for discharge or observation. Early diagnosis is critical, as delays can lead to permanent hip deformity, osteonecrosis, and long-term disability.
Key points include recognizing referred knee pain as a possible presentation, using Klein line on radiographs for detection, avoiding manipulation, and ensuring urgent orthopedic referral.
Slipped capital femoral epiphysis (SCFE) is an orthopedic condition in which the femoral epiphysis slips posteriorly and inferiorly relative to the femoral neck through the growth plate. It is classified by severity based on the percentage of slip (mild <33%, moderate 33–50%, severe >50%), by duration (acute <3 weeks, chronic >3 weeks, or acute-on-chronic), and by stability (stable if the patient can bear weight, unstable if not). It most commonly affects adolescents, with peak incidence at 12–14 years in boys and 11–12 years in girls, and occurs more frequently in males. Bilateral involvement is common, occurring in up to 20% initially and progressing in many others. Atypical cases may be associated with endocrinopathies and have a higher risk of bilateral disease.
The condition arises due to increased shear forces across a weakened proximal femoral physis during adolescence. As the growth plate becomes more oblique, mechanical forces shift from compression to shear. Risk factors include obesity (most common), Down syndrome, and endocrine disorders such as hypothyroidism, growth hormone deficiency, and renal osteodystrophy.
Patients often present with vague, poorly localized pain in the hip, groin, thigh, or even the knee due to referred pain. Chronic cases typically have dull pain over weeks with a limp, while acute cases present with sudden severe pain, often after minor trauma. On examination, patients may have an externally rotated leg, limited internal rotation, abduction, and flexion of the hip. A key clinical sign is obligatory external rotation during passive hip flexion. Gait abnormalities may include an antalgic gait, Trendelenburg gait in moderate-to-severe cases, or a waddling gait if bilateral involvement is present.
Diagnosis is primarily made with imaging. Plain radiographs of both hips are essential, including anteroposterior and lateral views. Findings may include widening of the physis, a “slipped” appearance of the epiphysis, and the classic Klein line abnormality (a line along the superior femoral neck that fails to intersect the epiphysis). If diagnosis is unclear, labs such as CBC, ESR, CRP, and endocrine studies may help evaluate alternative diagnoses or underlying causes.
Differential diagnoses include Legg–Calvé–Perthes disease, septic arthritis, osteomyelitis, transient synovitis, fractures, and hernias. It is important to always examine the hip in children presenting with knee or thigh pain to avoid missing SCFE.
Management is urgent and focuses on preventing further slippage and complications. The patient must be made strictly non–weight-bearing, and the hip should be immobilized. No attempts at reduction should be made in the emergency setting due to the risk of avascular necrosis. Immediate orthopedic consultation is required, as definitive treatment is typically surgical fixation with a single cannulated screw.
All cases of SCFE require admission for orthopedic management, especially acute, unstable, or bilateral cases. There is no role for discharge or observation. Early diagnosis is critical, as delays can lead to permanent hip deformity, osteonecrosis, and long-term disability.
Key points include recognizing referred knee pain as a possible presentation, using Klein line on radiographs for detection, avoiding manipulation, and ensuring urgent orthopedic referral.
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Emergency and Acute Medicine – Sleep Apnea
Sleep apnea is a disorder characterized by repeated cessation of breathing during sleep, defined as apneic episodes lasting more than 10 seconds and often associated with brief arousals or oxygen desaturation greater than 3%. It is strongly associated with obesity, male sex over 40 years of age, upper airway abnormalities, hypothyroidism, smoking, and alcohol or sedative use. Sleep apnea is linked to serious comorbidities including cardiac dysrhythmias (especially atrial fibrillation), heart failure, myocardial infarction, stroke, hypertension, and increased risk of motor vehicle accidents.
Epidemiologically, sleep apnea affects approximately 9% of middle-aged men and 4% of middle-aged women, with up to 80% of moderate-to-severe cases remaining undiagnosed. There are three main types: obstructive sleep apnea (most common, ~84%), caused by upper airway collapse despite respiratory effort; central sleep apnea (~0.4%), due to lack of respiratory drive; and complex sleep apnea (~15%), which combines features of both.
Patients commonly present with excessive daytime sleepiness, loud snoring, irritability, poor concentration, depression, and decreased libido. Often, a bed partner reports witnessed apneic episodes. Physical findings may include obesity, hypertension, hypoxemia, large neck circumference, craniofacial abnormalities, macroglossia, enlarged tonsils, and signs of pulmonary hypertension such as elevated jugular venous pressure.
Initial evaluation in the emergency setting includes pulse oximetry, ECG, and chest radiography. Arterial blood gas (ABG) analysis is the best test to demonstrate hypercarbia and hypoxemia. However, definitive diagnosis requires polysomnography, which identifies more than five apneic episodes per hour and is typically arranged outside the ED.
Management in the emergency setting focuses on airway stabilization. Basic measures include chin lift or jaw thrust, supplemental oxygen, and airway adjuncts such as oral or nasal airways. Bag-valve-mask ventilation may be challenging and often requires a two-person technique. Continuous positive airway pressure (CPAP) is the standard treatment, acting as a pneumatic splint to maintain airway patency. BiPAP may be used in patients requiring higher pressures or with coexisting respiratory conditions.
Airway management can be particularly difficult in these patients due to anatomical factors such as excess pharyngeal tissue and higher Mallampati scores. Clinicians should prepare for difficult intubation, have alternative airway devices available (e.g., laryngeal mask airway, bougie), and be ready for surgical airway if needed. Sedatives should be avoided whenever possible, as they worsen airway obstruction.
Long-term management emphasizes CPAP compliance and weight loss, which significantly reduce blood pressure, metabolic complications, and cardiovascular risk. Dental devices and surgical options may be considered but are less predictable. Patients should be referred to primary care or a pulmonologist for further evaluation and management, and cardiology referral is appropriate if complications such as heart failure or arrhythmias are present.
Patients may be discharged if they maintain adequate oxygenation (>85%) with available home support and have low risk of deterioration. Admission is required for ventilatory failure, need for intubation, or hemodynamic instability. Key points include recognizing the increased risk of cardiovascular disease, avoiding sedatives, anticipating difficult airway management, and reinforcing the importance of CPAP adherence.
Sleep apnea is a disorder characterized by repeated cessation of breathing during sleep, defined as apneic episodes lasting more than 10 seconds and often associated with brief arousals or oxygen desaturation greater than 3%. It is strongly associated with obesity, male sex over 40 years of age, upper airway abnormalities, hypothyroidism, smoking, and alcohol or sedative use. Sleep apnea is linked to serious comorbidities including cardiac dysrhythmias (especially atrial fibrillation), heart failure, myocardial infarction, stroke, hypertension, and increased risk of motor vehicle accidents.
Epidemiologically, sleep apnea affects approximately 9% of middle-aged men and 4% of middle-aged women, with up to 80% of moderate-to-severe cases remaining undiagnosed. There are three main types: obstructive sleep apnea (most common, ~84%), caused by upper airway collapse despite respiratory effort; central sleep apnea (~0.4%), due to lack of respiratory drive; and complex sleep apnea (~15%), which combines features of both.
Patients commonly present with excessive daytime sleepiness, loud snoring, irritability, poor concentration, depression, and decreased libido. Often, a bed partner reports witnessed apneic episodes. Physical findings may include obesity, hypertension, hypoxemia, large neck circumference, craniofacial abnormalities, macroglossia, enlarged tonsils, and signs of pulmonary hypertension such as elevated jugular venous pressure.
Initial evaluation in the emergency setting includes pulse oximetry, ECG, and chest radiography. Arterial blood gas (ABG) analysis is the best test to demonstrate hypercarbia and hypoxemia. However, definitive diagnosis requires polysomnography, which identifies more than five apneic episodes per hour and is typically arranged outside the ED.
Management in the emergency setting focuses on airway stabilization. Basic measures include chin lift or jaw thrust, supplemental oxygen, and airway adjuncts such as oral or nasal airways. Bag-valve-mask ventilation may be challenging and often requires a two-person technique. Continuous positive airway pressure (CPAP) is the standard treatment, acting as a pneumatic splint to maintain airway patency. BiPAP may be used in patients requiring higher pressures or with coexisting respiratory conditions.
Airway management can be particularly difficult in these patients due to anatomical factors such as excess pharyngeal tissue and higher Mallampati scores. Clinicians should prepare for difficult intubation, have alternative airway devices available (e.g., laryngeal mask airway, bougie), and be ready for surgical airway if needed. Sedatives should be avoided whenever possible, as they worsen airway obstruction.
Long-term management emphasizes CPAP compliance and weight loss, which significantly reduce blood pressure, metabolic complications, and cardiovascular risk. Dental devices and surgical options may be considered but are less predictable. Patients should be referred to primary care or a pulmonologist for further evaluation and management, and cardiology referral is appropriate if complications such as heart failure or arrhythmias are present.
Patients may be discharged if they maintain adequate oxygenation (>85%) with available home support and have low risk of deterioration. Admission is required for ventilatory failure, need for intubation, or hemodynamic instability. Key points include recognizing the increased risk of cardiovascular disease, avoiding sedatives, anticipating difficult airway management, and reinforcing the importance of CPAP adherence.
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Emergency and Acute Medicine - Skin Cancer
Skin cancer is the most common cancer in the United States, with a lifetime risk of approximately 1 in 6 individuals. Its incidence continues to rise, largely due to ultraviolet (UV) radiation exposure. Skin cancers are broadly categorized into nonmelanoma types—such as basal cell carcinoma (BCC) and squamous cell carcinoma (SCC)—and melanoma, which is less common but far more lethal.
Actinic keratosis is a premalignant lesion caused by chronic sun exposure. It appears as a rough, scaly, pink lesion on sun-exposed areas and carries a small but real risk (0.1–10%) of progression to SCC. BCC is the most common skin cancer, accounting for about 75% of nonmelanoma cases. It typically presents as a painless, pearly or waxy papule with telangiectasia and may ulcerate or bleed easily. It is locally invasive but rarely metastasizes and is most often found on the head and neck of fair-skinned individuals.
SCC is the second most common skin cancer and may arise from actinic keratosis. It presents as a firm, raised, keratotic lesion that may ulcerate and become painful as it invades surrounding tissue. Unlike BCC, SCC has the potential to metastasize to regional lymph nodes and distant sites, particularly when arising from mucosal surfaces or in immunocompromised individuals.
Melanoma arises from melanocytes and accounts for only about 5% of skin cancers but causes the majority of skin cancer-related deaths. It is strongly associated with sun exposure, especially blistering sunburns, and risk factors include fair skin, multiple or atypical nevi, family history, and immunosuppression. The ABCDE criteria are key for identifying suspicious lesions: asymmetry, border irregularity, color variation, diameter greater than 6 mm, and evolution or enlargement. Subtypes include superficial spreading melanoma (most common), nodular melanoma (more aggressive), lentigo maligna melanoma, and acral lentiginous melanoma, which occurs on palms, soles, and under nails.
Diagnosis of skin cancer is primarily clinical but must be confirmed with biopsy, which is typically arranged outside the emergency setting. Imaging may be used in advanced cases to assess metastasis, particularly in melanoma and aggressive SCC.
In the emergency department, management focuses on recognizing suspicious lesions and ensuring appropriate referral rather than definitive treatment. Most lesions do not require acute intervention unless complications such as bleeding, infection, or metastatic disease are present. Patients should be discharged with clear instructions for urgent dermatologic evaluation and biopsy.
Key points include maintaining a high index of suspicion for changing or atypical skin lesions, educating patients on sun protection (including both UVA and UVB exposure), and emphasizing the importance of early diagnosis. Patients with one skin cancer are at significant risk (30–50%) of developing another within five years, making follow-up essential.
Skin cancer is the most common cancer in the United States, with a lifetime risk of approximately 1 in 6 individuals. Its incidence continues to rise, largely due to ultraviolet (UV) radiation exposure. Skin cancers are broadly categorized into nonmelanoma types—such as basal cell carcinoma (BCC) and squamous cell carcinoma (SCC)—and melanoma, which is less common but far more lethal.
Actinic keratosis is a premalignant lesion caused by chronic sun exposure. It appears as a rough, scaly, pink lesion on sun-exposed areas and carries a small but real risk (0.1–10%) of progression to SCC. BCC is the most common skin cancer, accounting for about 75% of nonmelanoma cases. It typically presents as a painless, pearly or waxy papule with telangiectasia and may ulcerate or bleed easily. It is locally invasive but rarely metastasizes and is most often found on the head and neck of fair-skinned individuals.
SCC is the second most common skin cancer and may arise from actinic keratosis. It presents as a firm, raised, keratotic lesion that may ulcerate and become painful as it invades surrounding tissue. Unlike BCC, SCC has the potential to metastasize to regional lymph nodes and distant sites, particularly when arising from mucosal surfaces or in immunocompromised individuals.
Melanoma arises from melanocytes and accounts for only about 5% of skin cancers but causes the majority of skin cancer-related deaths. It is strongly associated with sun exposure, especially blistering sunburns, and risk factors include fair skin, multiple or atypical nevi, family history, and immunosuppression. The ABCDE criteria are key for identifying suspicious lesions: asymmetry, border irregularity, color variation, diameter greater than 6 mm, and evolution or enlargement. Subtypes include superficial spreading melanoma (most common), nodular melanoma (more aggressive), lentigo maligna melanoma, and acral lentiginous melanoma, which occurs on palms, soles, and under nails.
Diagnosis of skin cancer is primarily clinical but must be confirmed with biopsy, which is typically arranged outside the emergency setting. Imaging may be used in advanced cases to assess metastasis, particularly in melanoma and aggressive SCC.
In the emergency department, management focuses on recognizing suspicious lesions and ensuring appropriate referral rather than definitive treatment. Most lesions do not require acute intervention unless complications such as bleeding, infection, or metastatic disease are present. Patients should be discharged with clear instructions for urgent dermatologic evaluation and biopsy.
Key points include maintaining a high index of suspicion for changing or atypical skin lesions, educating patients on sun protection (including both UVA and UVB exposure), and emphasizing the importance of early diagnosis. Patients with one skin cancer are at significant risk (30–50%) of developing another within five years, making follow-up essential.
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Emergency and Acute Medicine - Sinusitis (Rhinosinusitis)
Rhinosinusitis refers to inflammation of the mucous membranes lining the nasal passages and paranasal sinuses, with or without fluid accumulation. It is classified based on duration: acute (<4 weeks), subacute (4–8 weeks), chronic (>8 weeks despite treatment), and recurrent (three or more episodes per year). The term “rhinosinusitis” is preferred because sinus inflammation rarely occurs without concurrent nasal mucosal involvement.
Most cases begin with a viral upper respiratory infection or allergic inflammation, which leads to mucosal swelling, obstruction of sinus drainage pathways, impaired mucociliary clearance, and thickened secretions. Although viral causes predominate, a small percentage (0.5–2.2%) progress to bacterial infection when trapped secretions allow bacterial proliferation. Chronic and subacute forms are multifactorial, involving allergies, immune dysfunction, impaired ciliary function, anatomical obstruction, or dental infections. Common bacterial pathogens include Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis, while chronic disease may involve polymicrobial and anaerobic organisms. Immunocompromised patients are at risk for fungal infections such as Aspergillus.
Patients typically present with facial pain or pressure, headache, purulent nasal discharge, postnasal drip, cough, fever, and decreased sense of smell. Pain location may help identify the affected sinus: frontal sinusitis causes forehead pain, maxillary sinusitis causes cheek or dental pain, ethmoid sinusitis causes retro-orbital pain with possible periorbital swelling, and sphenoid sinusitis (rare) causes occipital or deep head pain. On examination, findings may include nasal mucosal edema, purulent discharge, sinus tenderness, and sometimes periorbital edema.
Diagnosis is primarily clinical. Acute viral rhinosinusitis usually resolves within 7–10 days. Acute bacterial rhinosinusitis should be suspected in three scenarios: persistent symptoms beyond 10 days without improvement, severe symptoms (fever ≥39°C with purulent discharge for at least 3–4 days), or worsening symptoms after initial improvement (“double worsening”). Imaging is not required for uncomplicated cases but CT scanning is indicated if complications are suspected, such as orbital involvement, neurologic deficits, or severe disease.
Management depends on severity and duration. Most cases require only supportive care, including analgesics, saline nasal irrigation, and possibly intranasal corticosteroids—especially in patients with allergic components. Antibiotics are reserved for suspected bacterial cases and typically include amoxicillin–clavulanate as first-line therapy, with alternatives such as doxycycline in adults. Decongestants and certain antibiotics (e.g., macrolides, TMP-SMX) are generally not recommended due to limited benefit or resistance.
Hospital admission is required for patients with complications, such as orbital cellulitis, intracranial spread, severe systemic illness, or in immunocompromised individuals. Most uncomplicated cases can be managed on an outpatient basis with close follow-up.
Important clinical points include avoiding unnecessary antibiotics in mild cases of less than 10 days’ duration, recognizing red flags such as periorbital swelling or neurologic symptoms, and understanding that worsening symptoms after initial improvement strongly suggest bacterial infection.
Rhinosinusitis refers to inflammation of the mucous membranes lining the nasal passages and paranasal sinuses, with or without fluid accumulation. It is classified based on duration: acute (<4 weeks), subacute (4–8 weeks), chronic (>8 weeks despite treatment), and recurrent (three or more episodes per year). The term “rhinosinusitis” is preferred because sinus inflammation rarely occurs without concurrent nasal mucosal involvement.
Most cases begin with a viral upper respiratory infection or allergic inflammation, which leads to mucosal swelling, obstruction of sinus drainage pathways, impaired mucociliary clearance, and thickened secretions. Although viral causes predominate, a small percentage (0.5–2.2%) progress to bacterial infection when trapped secretions allow bacterial proliferation. Chronic and subacute forms are multifactorial, involving allergies, immune dysfunction, impaired ciliary function, anatomical obstruction, or dental infections. Common bacterial pathogens include Streptococcus pneumoniae, Haemophilus influenzae, and Moraxella catarrhalis, while chronic disease may involve polymicrobial and anaerobic organisms. Immunocompromised patients are at risk for fungal infections such as Aspergillus.
Patients typically present with facial pain or pressure, headache, purulent nasal discharge, postnasal drip, cough, fever, and decreased sense of smell. Pain location may help identify the affected sinus: frontal sinusitis causes forehead pain, maxillary sinusitis causes cheek or dental pain, ethmoid sinusitis causes retro-orbital pain with possible periorbital swelling, and sphenoid sinusitis (rare) causes occipital or deep head pain. On examination, findings may include nasal mucosal edema, purulent discharge, sinus tenderness, and sometimes periorbital edema.
Diagnosis is primarily clinical. Acute viral rhinosinusitis usually resolves within 7–10 days. Acute bacterial rhinosinusitis should be suspected in three scenarios: persistent symptoms beyond 10 days without improvement, severe symptoms (fever ≥39°C with purulent discharge for at least 3–4 days), or worsening symptoms after initial improvement (“double worsening”). Imaging is not required for uncomplicated cases but CT scanning is indicated if complications are suspected, such as orbital involvement, neurologic deficits, or severe disease.
Management depends on severity and duration. Most cases require only supportive care, including analgesics, saline nasal irrigation, and possibly intranasal corticosteroids—especially in patients with allergic components. Antibiotics are reserved for suspected bacterial cases and typically include amoxicillin–clavulanate as first-line therapy, with alternatives such as doxycycline in adults. Decongestants and certain antibiotics (e.g., macrolides, TMP-SMX) are generally not recommended due to limited benefit or resistance.
Hospital admission is required for patients with complications, such as orbital cellulitis, intracranial spread, severe systemic illness, or in immunocompromised individuals. Most uncomplicated cases can be managed on an outpatient basis with close follow-up.
Important clinical points include avoiding unnecessary antibiotics in mild cases of less than 10 days’ duration, recognizing red flags such as periorbital swelling or neurologic symptoms, and understanding that worsening symptoms after initial improvement strongly suggest bacterial infection.
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Emergency and Acute Medicine - Sickle Cell Disease
Sickle cell disease (SCD) is an autosomal recessive hemoglobinopathy caused by abnormal hemoglobin S (HbS), which polymerizes under stress and deforms red blood cells into a sickle shape. These rigid cells lead to chronic hemolysis, vaso-occlusion, and tissue ischemia or infarction. The disease results from a single amino acid substitution in the hemoglobin gene and primarily affects individuals of African, Mediterranean, Middle Eastern, and Asian descent. Disease severity varies widely depending on genotype, with HbSS being the most severe, while sickle cell trait (HbAS) is usually asymptomatic but may pose risks under extreme physiological stress.
SCD is characterized by chronic hemolytic anemia and progressive vasculopathy, leading to complications such as pulmonary hypertension, systemic hypertension, gallstones, leg ulcers, and priapism. Acute vaso-occlusive crises (VOC) are a hallmark and can affect virtually any organ system. Common acute complications include bone pain crises due to infarction of bone marrow, acute chest syndrome (a major cause of mortality characterized by pulmonary infiltrates, fever, and respiratory symptoms), splenic sequestration (which can cause rapid circulatory collapse, especially in children), aplastic crisis (often due to Parvovirus B19 causing severe anemia), cerebrovascular events (stroke or TIA), severe infections due to functional asplenia, and priapism.
Triggers for crises include infection, dehydration, hypoxia, acidosis, emotional stress, trauma, surgery, weather changes, and pregnancy. Clinically, patients may present with pain crises (commonly affecting bones, joints, chest, or abdomen) or with complications such as fever, respiratory distress, neurologic deficits, or signs of anemia. Importantly, patients in severe pain may not exhibit typical autonomic signs like tachycardia.
Evaluation requires a thorough history and physical examination, focusing on identifying complications and distinguishing typical from atypical presentations. Laboratory studies include CBC (with comparison to baseline hemoglobin), reticulocyte count (low in aplastic crisis), markers of hemolysis (bilirubin, LDH), and cultures if infection is suspected. Imaging is directed by symptoms, such as chest radiography for suspected acute chest syndrome or CT/MRI for neurologic symptoms.
Management focuses on prompt recognition and treatment of complications, aggressive pain control, and supportive care. Pain crises are treated with rapid and adequate analgesia, typically with IV opioids such as morphine or hydromorphone, along with adjuncts like acetaminophen or NSAIDs. Hydration is important but must be carefully balanced to avoid complications such as pulmonary edema or acidosis.
Specific complications require targeted therapy. Acute chest syndrome is treated with oxygen, bronchodilators, incentive spirometry, and possibly exchange transfusion. Splenic sequestration and aplastic crises may require blood transfusions. Stroke and severe complications often necessitate exchange transfusion. Priapism is managed initially with aspiration and intracavernosal medications, with escalation to exchange transfusion if needed. Empiric antibiotics are essential when infection is suspected.
Admission is required for refractory pain, significant complications, infection, or symptomatic anemia. ICU care is indicated for severe cases such as acute chest syndrome with hypoxemia, stroke, or hemodynamic instability. Patients may be discharged only when pain is controlled and no complications are present, with close follow-up arranged.
Key clinical points include aggressively treating pain, recognizing life-threatening complications early, and not relying on typical pain signs. Distinguishing a routine pain crisis from serious complications like acute chest syndrome or infection is critical in emergency care.
Sickle cell disease (SCD) is an autosomal recessive hemoglobinopathy caused by abnormal hemoglobin S (HbS), which polymerizes under stress and deforms red blood cells into a sickle shape. These rigid cells lead to chronic hemolysis, vaso-occlusion, and tissue ischemia or infarction. The disease results from a single amino acid substitution in the hemoglobin gene and primarily affects individuals of African, Mediterranean, Middle Eastern, and Asian descent. Disease severity varies widely depending on genotype, with HbSS being the most severe, while sickle cell trait (HbAS) is usually asymptomatic but may pose risks under extreme physiological stress.
SCD is characterized by chronic hemolytic anemia and progressive vasculopathy, leading to complications such as pulmonary hypertension, systemic hypertension, gallstones, leg ulcers, and priapism. Acute vaso-occlusive crises (VOC) are a hallmark and can affect virtually any organ system. Common acute complications include bone pain crises due to infarction of bone marrow, acute chest syndrome (a major cause of mortality characterized by pulmonary infiltrates, fever, and respiratory symptoms), splenic sequestration (which can cause rapid circulatory collapse, especially in children), aplastic crisis (often due to Parvovirus B19 causing severe anemia), cerebrovascular events (stroke or TIA), severe infections due to functional asplenia, and priapism.
Triggers for crises include infection, dehydration, hypoxia, acidosis, emotional stress, trauma, surgery, weather changes, and pregnancy. Clinically, patients may present with pain crises (commonly affecting bones, joints, chest, or abdomen) or with complications such as fever, respiratory distress, neurologic deficits, or signs of anemia. Importantly, patients in severe pain may not exhibit typical autonomic signs like tachycardia.
Evaluation requires a thorough history and physical examination, focusing on identifying complications and distinguishing typical from atypical presentations. Laboratory studies include CBC (with comparison to baseline hemoglobin), reticulocyte count (low in aplastic crisis), markers of hemolysis (bilirubin, LDH), and cultures if infection is suspected. Imaging is directed by symptoms, such as chest radiography for suspected acute chest syndrome or CT/MRI for neurologic symptoms.
Management focuses on prompt recognition and treatment of complications, aggressive pain control, and supportive care. Pain crises are treated with rapid and adequate analgesia, typically with IV opioids such as morphine or hydromorphone, along with adjuncts like acetaminophen or NSAIDs. Hydration is important but must be carefully balanced to avoid complications such as pulmonary edema or acidosis.
Specific complications require targeted therapy. Acute chest syndrome is treated with oxygen, bronchodilators, incentive spirometry, and possibly exchange transfusion. Splenic sequestration and aplastic crises may require blood transfusions. Stroke and severe complications often necessitate exchange transfusion. Priapism is managed initially with aspiration and intracavernosal medications, with escalation to exchange transfusion if needed. Empiric antibiotics are essential when infection is suspected.
Admission is required for refractory pain, significant complications, infection, or symptomatic anemia. ICU care is indicated for severe cases such as acute chest syndrome with hypoxemia, stroke, or hemodynamic instability. Patients may be discharged only when pain is controlled and no complications are present, with close follow-up arranged.
Key clinical points include aggressively treating pain, recognizing life-threatening complications early, and not relying on typical pain signs. Distinguishing a routine pain crisis from serious complications like acute chest syndrome or infection is critical in emergency care.
