- Published on
Emergency and Acute Medicine: Urinary Tract Fistula
Urinary tract fistulas are abnormal connections between any part of the urinary system and adjacent structures such as the gastrointestinal tract, reproductive organs, skin, or even thoracic or abdominal cavities. These fistulas can significantly impact quality of life and often present in emergency settings due to complications such as infection or continuous urine leakage.
The etiology varies depending on the type of fistula. Colovesical fistulas most commonly arise as complications of gastrointestinal diseases, particularly diverticular disease, but may also result from Crohn’s disease or colon carcinoma. Iatrogenic causes, such as surgery or radiation therapy, are also important contributors. In contrast, vesicovaginal fistulas are the most common acquired urinary fistulas and are typically due to surgical injury, pelvic pathology, or radiation exposure in developed countries, while obstructed labor and obstetric trauma are the leading causes in developing regions. Ureterovaginal and urethrovaginal fistulas are often associated with recent pelvic surgery, especially complicated hysterectomy. Trauma, including urethral disruption, is another possible cause, particularly in males.
Clinical presentation depends on the type of fistula. Colovesical fistulas often present with recurrent urinary tract infections, suprapubic pain, and characteristic findings such as pneumaturia (air in urine), fecaluria, hematuria, foul-smelling urine, or debris in the urine. Vesicovaginal fistulas typically present with painless, continuous leakage of urine from the vagina, often beginning one to three weeks after pelvic surgery or after catheter removal. Urethrovaginal fistulas may cause continuous or intermittent leakage depending on size and location. Ureterovaginal fistulas often present with intermittent vaginal urine leakage along with flank pain, fever, or ileus if associated with obstruction or urinoma formation.
A thorough history is essential, including past surgical, obstetric, and medical history, as well as the timing and characteristics of urinary leakage. Continuous leakage generally suggests a vesicovaginal fistula, whereas intermittent or positional leakage may suggest a ureterovaginal origin. On physical examination, findings may be minimal, but speculum examination in females may reveal pooling of urine in the vaginal vault or a small area of granulation tissue at the fistula site. In colovesical fistulas, physical findings are often related to the underlying gastrointestinal condition.
The diagnostic workup focuses on identifying associated complications such as infection or obstruction. Urinalysis may reveal white blood cells, bacteria, and debris. Renal function tests may be abnormal if obstruction is present. Imaging is typically not emergent but can be useful in defining the fistula. CT scan of the abdomen and pelvis with contrast is commonly used for suspected colovesical fistula. For genitourinary fistulas, cystoscopy with retrograde pyelography or intravenous pyelography may be used. Special diagnostic techniques include the charcoal test for colovesical fistula and the double-dye test to differentiate between vesicovaginal, ureterovaginal, and urethrovaginal fistulas based on the pattern of dye staining.
The differential diagnosis includes recurrent urinary tract infection and other causes of pneumaturia, such as infections with gas-forming organisms. Vaginal urine leakage must be distinguished from urinary incontinence, vaginitis, or normal vaginal discharge.
Management in the emergency setting is primarily supportive and focused on identifying and treating complications. Urosepsis, although uncommon, should be treated promptly with intravenous fluids, vasopressors if needed, and broad-spectrum antibiotics. If a urinary tract infection is present, appropriate antibiotics should be initiated. Placement of a urinary catheter may help reduce leakage in some cases. Definitive management usually requires surgical repair, so early referral to urology or gynecology is essential.
Most patients can be discharged if they are stable, have no evidence of sepsis, and can tolerate oral antibiotics if needed. Admission is required for patients with sepsis, inability to tolerate oral therapy, or complications related to the underlying disease such as malignancy or severe gastrointestinal pathology.
All patients require follow-up with a urologist or gynecologist for definitive evaluation and management. Important clinical pearls include maintaining a high index of suspicion in patients with recent pelvic surgery or recurrent urinary tract infections and recognizing that urine leakage from the vagina is often misdiagnosed as simple urinary incontinence. Additionally, malignancy should always be considered as an underlying cause in patients with urinary tract fistulas.
- Published on
Emergency and Acute Medicine: Urethritis
Urethritis is inflammation of the urethra, most commonly caused by infection, and is a frequent presentation in emergency and acute care settings. It typically presents with urethral discharge and dysuria and often develops after exposure to a sexual partner with a sexually transmitted infection (STI), bacterial vaginosis, or urinary tract infection. It may also occur after orogenital contact.
The most common etiologies are sexually transmitted pathogens, particularly Neisseria gonorrhoeae, which accounts for about 35% of cases, and Chlamydia trachomatis, responsible for 25–50%. Other significant causes include Mycoplasma genitalium and Ureaplasma urealyticum. Less commonly, organisms such as Trichomonas vaginalis, Herpes simplex virus, adenovirus, Candida species, and enteric bacteria may be involved. Noninfectious causes such as chemical irritation, alcohol, systemic illness, or foreign bodies are rare.
Symptoms usually develop within 1 to 2 weeks after exposure but may take up to 4 to 6 weeks. Patients commonly report urethral discharge, dysuria, and cloudy first-void urine. Pyuria is often present, and some patients may have inguinal lymphadenopathy. Important historical features include the color and quantity of discharge, associated urinary symptoms, recent sexual history, and risk factors such as multiple partners or unprotected intercourse.
On physical examination, findings may include visible urethral discharge, staining on undergarments, meatal crusting, and sometimes genital lesions. Palpation of the testes, epididymis, and spermatic cord is important to evaluate for complications such as epididymitis. Inguinal lymphadenopathy may also be present.
Diagnosis is typically confirmed using nucleic acid amplification tests (NAATs), such as PCR, performed on first-void urine or urethral swabs, which are highly sensitive for detecting gonorrhea and chlamydia. Urinalysis is useful to rule out urinary tract infection. Because STIs often coexist, patients should also be screened for HIV and syphilis using appropriate serologic tests.
The differential diagnosis includes urinary tract infection, prostatitis, epididymitis, orchitis, pelvic inflammatory disease, reactive arthritis, and chemical irritation from soaps or spermicides. In children, urethritis should raise concern for possible abuse.
Management in the emergency setting is largely empirical, with treatment directed at both gonorrhea and chlamydia regardless of confirmed results. Standard therapy includes ceftriaxone for gonorrhea and either azithromycin or doxycycline for chlamydia. In pregnant patients, azithromycin is preferred, as doxycycline and fluoroquinolones are contraindicated.
Most patients can be discharged after treatment with appropriate follow-up arranged. Patients should be advised to abstain from sexual activity until symptoms resolve and for at least one week after completing treatment. All sexual partners should be evaluated and treated to prevent reinfection. Repeat testing may be recommended, particularly in pregnant patients, to ensure cure.
Complications of untreated urethritis include epididymitis, pelvic inflammatory disease, infertility, reactive arthritis, and ocular complications. Key clinical pearls include always treating for both gonorrhea and chlamydia, recognizing increasing antibiotic resistance, and considering atypical organisms in recurrent cases.
- Published on
Emergency and Acute Medicine - Urinary Retention
Urinary retention is the sudden or chronic inability to empty the bladder adequately. Acute urinary retention refers to the abrupt inability to void spontaneously and occurs most often in men older than 60 years. In the emergency department, the most common cause is benign prostatic hyperplasia (BPH).
The causes of urinary retention are broad and include anatomic, neurologic, and medication-related conditions. Anatomic causes may involve the penis, urethra, or prostate and include phimosis, paraphimosis, meatal stenosis, tumors, pelvic masses, pelvic organ prolapse, foreign bodies, urethral calculi, urethritis, strictures, hematoma, vulvar edema after vaginal delivery, benign prostatic hypertrophy, prostate carcinoma, prostatitis, bladder neck contracture, and prostatic infarction. Neurologic causes include motor or paralytic disorders such as spinal shock and spinal cord syndromes, as well as sensory or paralytic disorders such as diabetes, multiple sclerosis, and other spinal cord syndromes. Medications may also precipitate retention, especially antihistamines, anticholinergics, antispasmodics, tricyclic antidepressants, alpha-adrenergic stimulators, narcotics, and NSAIDs.
Patients with acute urinary retention typically present with lower abdominal or suprapubic discomfort and may appear restless or distressed. Chronic urinary retention, in contrast, is often painless. A careful history is essential and should include any prior episodes of urinary retention, history of BPH or prostate cancer, other malignancy, prior radiation treatment, pelvic trauma, signs or symptoms of infection or abscess, symptoms suggesting urinary stones, neurologic complaints, intravenous drug use, back pain, and a complete medication review.
The physical examination should include assessment of vital signs for evidence of infection or shock, an abdominal examination, a rectal examination, and a genitourinary examination. In women, a pelvic examination should be considered. If the presentation suggests a neurologic cause, a thorough neurologic examination is necessary. In trauma patients, special attention should be given to possible urethral injury.
Because urinary retention has many possible causes, the workup is guided by the history and examination. Laboratory testing is usually limited. Renal function tests may be obtained if acute renal insufficiency is suspected, although this is uncommon in isolated acute urinary retention. A PSA test is not useful in the emergency department because it is often elevated in the setting of retention. Urinalysis may be obtained if the history or exam suggests infection. Imaging such as abdominal or pelvic ultrasound or CT may be indicated if there is concern for a mass, abscess, malignancy, bladder calculi, or another structural cause. Neuroimaging or spinal imaging is warranted if an acute neurologic process is suspected. A postvoid residual volume greater than 200 mL is generally considered abnormal.
Management begins with identifying and treating any immediately life-threatening condition. The key initial step is prompt bladder decompression. This is usually attempted with placement of a 14–18 French urinary catheter. If that cannot be passed and there is a history of prior transurethral procedures or known stricture, a smaller 10–12 French catheter may be tried. In men without prior instrumentation, a 20–22 French coudé catheter may be helpful. If catheter placement remains unsuccessful, suprapubic aspiration or suprapubic catheter placement may be required. In trauma patients with suspected urethral injury, such as those with gross hematuria, blood at the meatus, or a high-riding prostate, urethral catheterization should be deferred until a retrograde urethrogram has been performed.
After catheter placement, the bladder should be drained and urine output monitored. Rapid decompression may occasionally cause transient gross hematuria, though this is rarely clinically significant. Postobstructive diuresis is a possible complication after relief of retention, so it is reasonable to observe patients for two to three hours to ensure they do not develop hypotension or significant volume loss. If the catheter is to remain in place, a leg bag should be attached before discharge, and the patient and family should receive instructions on catheter care. Prophylactic antibiotics are not indicated for an indwelling urinary catheter unless there is evidence of infection. If BPH is the cause, starting an alpha-blocker is appropriate. Medications contributing to retention should be discontinued when possible, and constipation should be treated if present.
Common medications used for BPH-related urinary retention include alpha-blockers such as prazosin, tamsulosin, alfuzosin, and terazosin. These agents help improve urinary flow and are often started in the emergency setting when BPH is suspected.
Most patients can be discharged after successful bladder decompression, provided there is no serious underlying cause or complication. Admission is indicated for significant postobstructive diuresis requiring IV fluids or vasopressors, sepsis, retention related to spinal cord compression, obstruction caused by malignancy or a mass, or any condition requiring urgent urologic or surgical intervention.
All patients require follow-up for continued evaluation of the underlying cause, management of the catheter if one remains in place, and further treatment planning. Important pitfalls include failing to recognize a mass or malignancy, overlooking spinal cord compression, and missing a medication-related cause. A careful drug history, including over-the-counter medications, is especially important when no obvious cause is identified.
Urinary retention is the sudden or chronic inability to empty the bladder adequately. Acute urinary retention refers to the abrupt inability to void spontaneously and occurs most often in men older than 60 years. In the emergency department, the most common cause is benign prostatic hyperplasia (BPH).
The causes of urinary retention are broad and include anatomic, neurologic, and medication-related conditions. Anatomic causes may involve the penis, urethra, or prostate and include phimosis, paraphimosis, meatal stenosis, tumors, pelvic masses, pelvic organ prolapse, foreign bodies, urethral calculi, urethritis, strictures, hematoma, vulvar edema after vaginal delivery, benign prostatic hypertrophy, prostate carcinoma, prostatitis, bladder neck contracture, and prostatic infarction. Neurologic causes include motor or paralytic disorders such as spinal shock and spinal cord syndromes, as well as sensory or paralytic disorders such as diabetes, multiple sclerosis, and other spinal cord syndromes. Medications may also precipitate retention, especially antihistamines, anticholinergics, antispasmodics, tricyclic antidepressants, alpha-adrenergic stimulators, narcotics, and NSAIDs.
Patients with acute urinary retention typically present with lower abdominal or suprapubic discomfort and may appear restless or distressed. Chronic urinary retention, in contrast, is often painless. A careful history is essential and should include any prior episodes of urinary retention, history of BPH or prostate cancer, other malignancy, prior radiation treatment, pelvic trauma, signs or symptoms of infection or abscess, symptoms suggesting urinary stones, neurologic complaints, intravenous drug use, back pain, and a complete medication review.
The physical examination should include assessment of vital signs for evidence of infection or shock, an abdominal examination, a rectal examination, and a genitourinary examination. In women, a pelvic examination should be considered. If the presentation suggests a neurologic cause, a thorough neurologic examination is necessary. In trauma patients, special attention should be given to possible urethral injury.
Because urinary retention has many possible causes, the workup is guided by the history and examination. Laboratory testing is usually limited. Renal function tests may be obtained if acute renal insufficiency is suspected, although this is uncommon in isolated acute urinary retention. A PSA test is not useful in the emergency department because it is often elevated in the setting of retention. Urinalysis may be obtained if the history or exam suggests infection. Imaging such as abdominal or pelvic ultrasound or CT may be indicated if there is concern for a mass, abscess, malignancy, bladder calculi, or another structural cause. Neuroimaging or spinal imaging is warranted if an acute neurologic process is suspected. A postvoid residual volume greater than 200 mL is generally considered abnormal.
Management begins with identifying and treating any immediately life-threatening condition. The key initial step is prompt bladder decompression. This is usually attempted with placement of a 14–18 French urinary catheter. If that cannot be passed and there is a history of prior transurethral procedures or known stricture, a smaller 10–12 French catheter may be tried. In men without prior instrumentation, a 20–22 French coudé catheter may be helpful. If catheter placement remains unsuccessful, suprapubic aspiration or suprapubic catheter placement may be required. In trauma patients with suspected urethral injury, such as those with gross hematuria, blood at the meatus, or a high-riding prostate, urethral catheterization should be deferred until a retrograde urethrogram has been performed.
After catheter placement, the bladder should be drained and urine output monitored. Rapid decompression may occasionally cause transient gross hematuria, though this is rarely clinically significant. Postobstructive diuresis is a possible complication after relief of retention, so it is reasonable to observe patients for two to three hours to ensure they do not develop hypotension or significant volume loss. If the catheter is to remain in place, a leg bag should be attached before discharge, and the patient and family should receive instructions on catheter care. Prophylactic antibiotics are not indicated for an indwelling urinary catheter unless there is evidence of infection. If BPH is the cause, starting an alpha-blocker is appropriate. Medications contributing to retention should be discontinued when possible, and constipation should be treated if present.
Common medications used for BPH-related urinary retention include alpha-blockers such as prazosin, tamsulosin, alfuzosin, and terazosin. These agents help improve urinary flow and are often started in the emergency setting when BPH is suspected.
Most patients can be discharged after successful bladder decompression, provided there is no serious underlying cause or complication. Admission is indicated for significant postobstructive diuresis requiring IV fluids or vasopressors, sepsis, retention related to spinal cord compression, obstruction caused by malignancy or a mass, or any condition requiring urgent urologic or surgical intervention.
All patients require follow-up for continued evaluation of the underlying cause, management of the catheter if one remains in place, and further treatment planning. Important pitfalls include failing to recognize a mass or malignancy, overlooking spinal cord compression, and missing a medication-related cause. A careful drug history, including over-the-counter medications, is especially important when no obvious cause is identified.
- Published on
Emergency and Acute Medicine: Urethral Trauma
Urethral trauma is a significant genitourinary injury most commonly associated with pelvic fractures and high-energy trauma. Classic clinical findings include blood at the urethral meatus, inability to void, a palpable distended bladder, and/or gross hematuria. It occurs in approximately 14% of pelvic fractures and is strongly associated with bilateral pubic rami (straddle) fractures.
In females, urethral injuries are rare due to the short, mobile, and relatively protected urethra, though risk is higher in younger patients with more flexible pelvic anatomy. When injuries do occur, the bladder neck is most commonly affected. In males, urethral trauma is more common and anatomically divided into anterior and posterior injuries. Posterior urethral injuries—affecting the prostatic and membranous urethra—account for about 90% of cases and are typically associated with pelvic fractures. These injuries are classified as stretching (type 1), partial or complete disruption with intact urogenital diaphragm (type 2), or complete disruption both proximal and distal to the diaphragm (type 3). Anterior urethral injuries (bulbar or penile) are less common and are typically associated with straddle injuries or penetrating trauma.
Etiologies differ by sex and mechanism. In males, pelvic fractures, straddle injuries, penetrating trauma, and instrumentation are common causes. In females, causes include pelvic trauma, childbirth, surgical injury, or sexual trauma. A history of pelvic or perineal trauma is often present.
Clinically, males may present with blood at the urethral meatus (seen in about 50% of cases), gross hematuria, and urinary retention. In females, blood may be seen in the vaginal vault. Physical examination during trauma assessment may reveal pelvic tenderness and bladder distention. The classic triad—blood at the meatus, inability to void, and a palpable bladder—is highly suggestive. A “high-riding prostate” on digital rectal exam has low sensitivity and should not be relied upon. Bedside ultrasound (FAST) may demonstrate fluid around the bladder.
Diagnosis requires a high index of suspicion. The essential rule in suspected urethral injury is to avoid blind Foley catheter placement until urethral integrity is confirmed. The gold standard diagnostic test is retrograde urethrography (RUG), in which contrast is injected into the urethra to assess for extravasation. Complete tears show no contrast entering the bladder, while partial tears allow some contrast passage with leakage. Because up to 40% of urethral injuries are associated with bladder injuries, cystography is also recommended.
Management prioritizes overall trauma stabilization (ABCs) before addressing the urethral injury. Early urologic consultation is essential. Bladder decompression is a key step; if urethral catheterization is unsafe or unsuccessful, suprapubic catheter placement or cystostomy is performed. Definitive management depends on the severity of injury: partial tears are typically managed with catheter drainage, while complete disruptions often require surgical repair or delayed reconstruction.
Patients with associated injuries, hemodynamic instability, or severe urethral damage require admission, often to a surgical or ICU setting. Isolated injuries may be managed on an outpatient basis after appropriate urinary diversion and with close urologic follow-up.
Important clinical pearls include recognizing blood at the urethral meatus as a red flag for urethral injury and avoiding catheter insertion until imaging is performed. Failure to diagnose urethral trauma can result in long-term complications such as urinary incontinence, urethral stricture, and sexual dysfunction.
- Published on
Emergency and Acute Medicine: Tympanic Membrane Perforation
Tympanic membrane (TM) perforation refers to a disruption or hole in the eardrum and can be classified by duration, location, and extent. Acute perforations are defined as those present for less than 3 months, whereas chronic perforations persist beyond this period. Anatomically, perforations may involve the pars tensa or pars flaccida, and the extent may range from small defects confined to one quadrant to total perforations involving the entire membrane.
The most common cause of acute TM perforation is infection, particularly acute otitis media, where increased middle ear pressure leads to rupture. Trauma is another frequent cause and may be blunt, such as a slap to the ear (often seen in assaults or domestic violence), or penetrating, such as injury from cotton swabs (Q-tips). Rapid pressure changes from activities like diving or flying can also cause rupture (barotrauma), as can blast injuries, extreme noise exposure, lightning strikes, and thermal injuries such as slag burns during welding. Less commonly, perforation may result from surgical procedures (e.g., myringotomy or tympanostomy tube placement) or infections like acute necrotizing myringitis.
Patients typically present with mild ear pain, though severe pain or complete hearing loss may indicate more serious associated injury. Other common symptoms include tinnitus, vertigo (especially if injury occurs in water), and partial hearing loss. On physical examination, findings may include visible perforation on otoscopy, decreased hearing, and purulent or bloody discharge from the ear canal. Small perforations may only be detected by decreased mobility of the tympanic membrane during pneumatic otoscopy. Special tests such as the Weber and Rinne tuning fork tests help differentiate conductive from sensorineural hearing loss. The presence of nystagmus or vertigo during pressure testing may suggest a more serious inner ear injury such as a labyrinthine fistula.
Diagnosis is primarily clinical, based on direct visualization of the tympanic membrane and hearing assessment. If discharge is present, culture may be considered. Imaging, particularly CT of the temporal bone, is reserved for cases where a temporal bone fracture or more severe injury is suspected.
Management in the emergency setting focuses on supportive care and prevention of complications. Initial stabilization follows standard trauma principles when indicated. The ear canal should be gently cleared of debris using suction or manual removal, but irrigation must be avoided to prevent forcing contaminants into the middle ear. Routine prophylactic antibiotics are not necessary; however, antibiotics should be prescribed if there is evidence of infection or contamination (e.g., water exposure). Common options include amoxicillin or amoxicillin-clavulanate. Ototopical antibiotics—particularly fluoroquinolone drops such as ciprofloxacin with dexamethasone—are preferred in cases of chronic suppurative otitis media or when contamination is suspected, as they are safer with respect to ototoxicity compared to other agents.
Urgent ENT consultation is indicated in patients with concerning features such as vertigo, sensorineural hearing loss, severe tinnitus, significant bleeding, or facial nerve paralysis. Most patients can be safely discharged with outpatient follow-up. Nearly all tympanic membrane perforations heal spontaneously, especially small ones—many within weeks to months. Surgical repair (e.g., tympanoplasty) is reserved for the minority (10–20%) that fail to heal.
Patients should be given clear discharge instructions to prevent complications. They should keep the ear dry by occluding it during showering, avoid swimming unless protected, and refrain from forceful nose blowing. Prognosis is generally excellent, though complications such as infection, ossicular disruption, perilymph leakage, or cholesteatoma can occur in some cases.
Key clinical pearls include recognizing acute otitis media as the most common cause, avoiding irrigation of the ear, and understanding that most perforations heal without intervention. Proper protection of the ear from water and contaminants is essential to promote healing and prevent infection.
- Published on
Emergency and Acute Medicine: Ultraviolet Keratitis
Ultraviolet keratitis is a painful ocular condition caused by corneal epithelial damage following exposure to ultraviolet (UV) light. Also known as photokeratitis, snow blindness, UV conjunctivitis, or welder’s flash, it results from absorption of UV radiation—particularly at wavelengths around 290 nm—by the corneal epithelium. This exposure damages epithelial cells and penetrates to nociceptor nerve endings, leading to intense pain due to subepithelial nerve stimulation.
The condition is commonly associated with occupational exposures such as welding, electrical work, and mechanical tasks, as well as recreational exposures including skiing, snowboarding, water sports, and use of tanning beds. The severity of injury is directly related to the intensity and duration of UV exposure. Importantly, patients are often unaware of the exposure at the time of injury.
Symptoms typically develop with a delay of 6–12 hours after exposure. Patients usually present with bilateral eye pain, photophobia, tearing, and redness. A foreign-body sensation is commonly reported, but purulent discharge is absent. Additional findings may include eyelid edema, facial erythema, and blepharospasm. On examination, visual acuity may be mildly decreased. Conjunctival injection, chemosis, and excessive tearing are typical. Slit-lamp examination with fluorescein staining reveals multiple superficial punctate epithelial lesions across the cornea, which are characteristic of the condition.
Diagnosis is clinical and relies heavily on history and physical examination. A key diagnostic clue is a history of UV exposure several hours prior to symptom onset. Evaluation should include assessment of visual acuity, extraocular movements, and a detailed ocular exam with fluorescein staining. Lid eversion is important to rule out retained foreign bodies, and the anterior chamber should be assessed for signs of inflammation such as cells or flare. Laboratory tests and imaging are generally not required unless other injuries are suspected.
Management is primarily supportive, as ultraviolet keratitis is a self-limited condition. In the emergency setting, topical anesthetics may be used to facilitate examination but should not be prescribed for outpatient use due to the risk of delayed healing and corneal ulceration. Treatment includes oral analgesics such as ibuprofen or acetaminophen (with or without opioids for severe pain), topical antibiotic ointment (e.g., erythromycin) to prevent secondary infection, and short-acting cycloplegic agents to relieve ciliary spasm. Eye patching may provide comfort but does not accelerate healing.
Disposition is generally outpatient, as most cases resolve completely within 24–72 hours. Admission is rarely required but may be considered in cases of severe visual impairment, inability to care for oneself, or when both eyes are patched and functional vision is significantly impaired. Follow-up with an ophthalmologist within 24–48 hours is recommended to ensure proper healing and symptom resolution.
Key clinical pearls include recognizing the delayed onset of symptoms after UV exposure, which is critical for diagnosis, and understanding that the condition, while extremely painful, is typically benign and self-limited. Preventive measures are essential—individuals at risk should use appropriate UV-protective eyewear, as regular glasses or contact lenses do not provide adequate protection.
- Published on
Emergency and Acute Medicine – Transient Ischemic Attack (TIA)
A transient ischemic attack (TIA) is a brief episode of neurologic dysfunction caused by a temporary reduction in blood flow to a region of the central nervous system. Traditionally defined as symptoms lasting less than 24 hours, most TIAs resolve within one hour. Importantly, TIA is a major warning sign for impending stroke, with approximately 12–30% of strokes preceded by a TIA.
The underlying mechanism involves transient cerebral hypoperfusion. Common causes include atherosclerotic thrombosis in large or medium arteries, small vessel disease, and emboli originating from the heart—particularly in conditions such as Atrial fibrillation. Less common causes include arterial dissection, vasculitis, and hypercoagulable states, while in a significant proportion of patients, no clear etiology is identified.
Clinical presentation depends on the vascular territory affected. Large-vessel TIAs produce characteristic focal deficits. For example, involvement of the middle cerebral artery causes contralateral weakness and sensory loss affecting the face and arm more than the leg, often accompanied by aphasia (dominant hemisphere) or neglect (nondominant hemisphere). Posterior circulation TIAs may present with vertigo, ataxia, diplopia, or cranial nerve deficits. Transient monocular blindness, known as amaurosis fugax, reflects involvement of the ophthalmic branch of the internal carotid artery. Small-vessel (lacunar) TIAs typically produce isolated motor or sensory deficits without cortical signs.
The history is critical in diagnosis. TIAs typically have sudden onset, short duration, and produce “negative” neurologic symptoms such as weakness, vision loss, or aphasia due to loss of function. In contrast, gradual onset or “positive” symptoms such as tingling, jerking, or visual scintillations suggest alternative diagnoses like migraine or seizure.
Physical examination should include a detailed neurologic assessment, evaluating strength, sensation, coordination, speech, and visual fields. By definition, neurologic deficits resolve in TIA; persistent deficits indicate an acute Ischemic stroke rather than TIA. Standardized tools such as the NIH Stroke Scale can aid in assessment and monitoring.
Initial evaluation in the emergency setting focuses on excluding mimics and identifying risk factors. A rapid bedside glucose test is essential, as hypoglycemia can mimic focal neurologic deficits. A noncontrast CT scan of the head should be obtained urgently to exclude intracranial hemorrhage. MRI with diffusion-weighted imaging is more sensitive and may reveal infarction in up to 50% of patients initially thought to have TIA. Vascular imaging of the head and neck—via CT angiography, MR angiography, or carotid ultrasound—is important, as nearly half of patients have significant arterial stenosis or occlusion.
Additional workup includes ECG to detect arrhythmias such as atrial fibrillation and echocardiography to evaluate for cardiac sources of emboli. Laboratory tests assess metabolic abnormalities,
- Published on
Emergency and Acute Medicine – Transplant Rejection
Transplant rejection is an immune-mediated response against a transplanted organ due to recognition of genetically dissimilar antigens, most commonly related to human leukocyte antigen (HLA) incompatibility. Although blood group incompatibility plays a lesser role, it can still result in severe reactions such as hyperacute rejection, particularly in vascularized organs like the kidney and heart. Rejection remains a significant cause of morbidity in transplant recipients, although infection is a more common reason for emergency department presentation.
Rejection is classically divided into three phases. Hyperacute rejection occurs immediately after transplantation and is caused by preformed antibodies against donor antigens, leading to endothelial injury, platelet aggregation, thrombosis, and rapid graft necrosis. This form is now rare due to improved donor–recipient matching. Acute rejection typically occurs within the first three months but can happen at any time, especially with reduction or noncompliance with immunosuppressive therapy. It is primarily T-cell–mediated and results in inflammatory infiltration and destruction of the graft. Chronic rejection develops over months to years and leads to progressive fibrosis and eventual organ failure.
The epidemiology of transplantation shows that kidney transplants are the most common, followed by liver, heart, lung, and pancreas. Despite advances in immunosuppressive therapy, rejection still accounts for a portion of emergency visits and hospital admissions. A major contributing factor is medication noncompliance or drug interactions affecting levels of immunosuppressive agents such as cyclosporine or tacrolimus.
Clinical presentation varies depending on the transplanted organ. Renal transplant rejection may present with hypertension, decreased urine output, and sometimes swelling or fever, although symptoms may be subtle due to immunosuppression. Liver transplant rejection often manifests as fever, right upper quadrant pain, and jaundice. Heart transplant rejection may present with dyspnea, chest pain, arrhythmias, hypotension or hypertension, and can even be asymptomatic or lead to sudden death. Lung transplant rejection typically presents with cough, dyspnea, fever, and abnormal lung sounds. Bone marrow transplant rejection, including graft-versus-host disease, can involve multiple systems, presenting with fever, rash, gastrointestinal symptoms, pulmonary findings, and neurologic complications.
Evaluation requires a high index of suspicion, as symptoms may be mild or nonspecific. Laboratory testing includes complete blood count, immunosuppressant drug levels, and organ-specific markers such as creatinine for kidney transplants, liver function tests for liver transplants, and cardiac biomarkers for heart transplants. Imaging plays an important role, including chest radiography for lung involvement, ultrasound for renal or hepatic grafts, and echocardiography for cardiac function. In some cases, biopsy is required to distinguish rejection from infection. Opportunistic infections such as Cytomegalovirus infection or fungal infections like Aspergillosis may mimic rejection and must always be considered.
Management in the emergency setting begins with stabilization following standard ABC principles. Shock should be treated with fluids and vasopressors as needed, while hypertensive crises are managed according to standard protocols. A key principle is early communication with the transplant team before initiating or modifying therapy. High-dose corticosteroids are commonly used in suspected acute rejection, and stress-dose steroids should be considered in ill transplant patients. Care must be taken with medications such as NSAIDs and blood transfusions due to potential complications in this population.
Special considerations apply to specific organs. In heart transplant patients, atropine is ineffective for bradycardia due to lack of vagal innervation, and alternative therapies such as dopamine, epinephrine, or pacing are required. Lung transplant patients often require treatment for both infection and rejection simultaneously. Bone marrow transplant patients with graft-versus-host disease typically require systemic corticosteroids and adjustments in immunosuppressive therapy.
Disposition depends on severity. Most transplant patients presenting with symptoms suggestive of rejection, infection, or organ dysfunction require hospital admission, and many need ICU-level care. Patients who are stable and in whom serious causes have been excluded may be discharged with close follow-up in coordination with their transplant team.
Key clinical pearls include maintaining a broad differential diagnosis, as infection and drug toxicity frequently mimic rejection. Even minor complaints in transplant patients warrant thorough evaluation. Early consultation with transplant specialists is essential, and a low threshold for admission is appropriate given the high risk of complications.
- Published on
Emergency and Acute Medicine – Transient Global Amnesia
Transient global amnesia (TGA) is a sudden, temporary episode of memory loss characterized by abrupt onset of profound anterograde amnesia without other focal neurologic deficits. Patients are unable to form new memories during the episode, resulting in repetitive questioning and confusion about recent events. Despite this, personal identity—such as name, birth date, and address—remains intact. After recovery, there is typically a permanent memory gap corresponding to the duration of the episode, while previously stored memories gradually return.
TGA is relatively uncommon, with an incidence of approximately 3–8 cases per 100,000 people, most often affecting individuals between 50 and 70 years of age. It is rare in patients younger than 40. Episodes usually last between 1 and 8 hours, although durations can range from 15 minutes up to 24 hours, and by definition must resolve within that time frame.
The exact cause of TGA remains unclear. Imaging studies such as MRI, SPECT, and PET have demonstrated transient abnormalities in the hippocampus, a brain region critical for memory formation. Proposed mechanisms include transient venous congestion of the hippocampus during Valsalva-like activities, vasoconstriction related to hyperventilation, and migraine-associated phenomena. Importantly, there is no established link between TGA and thromboembolic stroke or other forms of Cerebrovascular disease.
Diagnosis is clinical and relies on strict criteria. The episode must be witnessed, with sudden onset of anterograde amnesia and no alteration in consciousness. There should be no focal neurologic deficits, seizure activity, or recent head trauma. Cognitive function remains intact aside from memory impairment, and the patient retains awareness of self. The episode must resolve within 24 hours, and alternative causes of amnesia must be excluded.
Patients often present after a triggering event such as physical exertion, emotional stress, sexual activity, temperature extremes, or Valsalva maneuvers. They may repeatedly ask questions like “Where am I?” or “How did I get here?” while remaining cooperative and able to follow complex commands. Associated symptoms such as mild headache, dizziness, or nausea may occur at onset.
On examination, patients demonstrate marked anterograde amnesia but are otherwise neurologically normal. They are alert, attentive, and oriented to personal identity. They can perform complex tasks and do not exhibit aphasia, apraxia, or agnosia. Importantly, they are not globally confused, somnolent, or inattentive—features that would suggest alternative diagnoses such as encephalopathy.
In classic cases, no diagnostic testing is required. However, if the diagnosis is uncertain, further evaluation may include laboratory testing to rule out metabolic or toxic causes, imaging such as MRI (which may show transient hippocampal lesions), CT scan for structural pathology, EEG for seizure activity, or lumbar puncture if encephalitis is suspected.
The differential diagnosis includes transient ischemic attack involving posterior circulation, complex partial seizures, psychogenic amnesia, metabolic encephalopathy, and early dementia such as Alzheimer disease. These conditions can usually be distinguished by additional neurologic findings, altered consciousness, shorter or recurrent episodes, or broader cognitive impairment.
Management of TGA is supportive, as the condition is self-limited and benign. Patients should be observed until symptoms resolve, and reassurance should be provided to both the patient and family. No specific pharmacologic treatment is indicated.
Disposition depends on clinical certainty and recovery. Patients with a clear diagnosis and resolving symptoms, along with good social support, can be safely discharged. Admission is appropriate for patients with uncertain diagnosis, incomplete resolution, or inadequate support at home.
The recurrence rate of TGA is relatively low, around 8%. Patients with recurrent episodes should be referred to a neurologist for further evaluation, including possible EEG to exclude seizure disorders.
Key clinical pearls include recognizing TGA as a benign condition characterized by isolated anterograde amnesia with preserved identity and normal neurologic exam. Clinicians must remain vigilant for red flags such as focal deficits, impaired consciousness, or recurrent brief episodes, which may indicate more serious conditions like seizure, encephalitis, or vascular events.
- Published on
Emergency and Acute Medicine – Transfusion Complications
Transfusion complications are relatively common clinical events associated with blood product administration, ranging from mild allergic reactions to life-threatening conditions. Approximately 5–6% of hospitalized patients receive transfusions, and about 2% of transfused units result in some type of reaction within 24 hours. Although mortality is rare, complications can be severe, especially with acute hemolytic reactions or pulmonary syndromes.
Noninfectious complications are more common than infectious ones. Febrile nonhemolytic reactions occur in approximately 1 in 500 red blood cell transfusions and are characterized by fever and chills due to antigen–antibody reactions involving leukocytes or cytokines. Allergic reactions are relatively frequent and usually mild, presenting with urticaria or pruritus, while anaphylaxis is rare but potentially fatal. Acute hemolytic transfusion reactions, often due to ABO incompatibility, are uncommon but dangerous, occurring in roughly 1 in 38,000 to 70,000 transfusions. Delayed hemolytic reactions occur days later and are typically less severe.
Transfusion-associated circulatory overload (TACO) is relatively common, particularly in elderly or volume-sensitive patients, and presents with signs of fluid overload such as dyspnea and hypertension. Transfusion-related acute lung injury (TRALI) is a serious complication presenting within 6 hours of transfusion with acute respiratory distress, bilateral pulmonary infiltrates, and normal cardiac function. It is a leading cause of transfusion-related mortality and must be distinguished from TACO and Acute Respiratory Distress Syndrome.
Other important complications include electrolyte disturbances such as hypocalcemia (due to citrate binding calcium) and hyperkalemia (from stored blood breakdown), iron overload with repeated transfusions, and rare but fatal graft-versus-host disease. Infectious complications are now rare due to screening but include transmission of viruses such as HIV, Hepatitis B, and Hepatitis C, as well as bacterial contamination (especially in platelet transfusions), which remains the most common infectious cause of mortality.
Acute intravascular hemolytic transfusion reactions are the most severe form and typically occur immediately due to ABO incompatibility, often from clerical or identification errors. Even small volumes (5–20 mL) can trigger symptoms. These reactions result in rapid destruction of transfused red blood cells, triggering a cascade involving cytokine release, activation of the coagulation system, and potential progression to shock, disseminated intravascular coagulation, renal failure, and respiratory failure.
Clinical manifestations of transfusion reactions vary widely but commonly include fever, chills, urticaria, dyspnea, hypotension, chest pain, nausea, and hemoglobinuria. Severe reactions may present with shock, bleeding, renal failure, or respiratory distress. The classic triad of fever, flank pain, and dark urine in hemolytic reactions is uncommon but highly suggestive when present.
Evaluation begins with immediate recognition of symptoms and verification of patient and blood product identity. Laboratory testing includes CBC, electrolytes, renal function, coagulation studies, bilirubin, and a direct Coombs test. Hemolysis may be indicated by hemoglobinemia or hemoglobinuria. Imaging such as chest x-ray is useful when pulmonary complications like TRALI are suspected, typically showing bilateral infiltrates without cardiomegaly.
Management requires immediate cessation of the transfusion as the first and most critical step. Supportive care follows the ABC approach, including oxygen supplementation and hemodynamic stabilization. Intravenous fluids with normal saline are used for hypotension, while avoiding lactated solutions or dextrose-containing fluids. Maintaining adequate urine output is essential to prevent renal failure, often requiring diuretics such as furosemide or osmotic agents like mannitol.
Febrile reactions are treated with antipyretics, while allergic reactions are managed with antihistamines such as diphenhydramine. Severe allergic or anaphylactic reactions require prompt administration of epinephrine and corticosteroids. In cases of electrolyte disturbances, calcium replacement may be necessary. If disseminated intravascular coagulation develops, it must be treated accordingly.
Patients with severe reactions, including hemolysis, anaphylaxis, pulmonary complications, or sepsis, require ICU admission and close monitoring. Mild febrile or allergic reactions may be managed conservatively and discharged with appropriate follow-up.
Key clinical pearls include the importance of strict patient identification and cross-matching procedures to prevent catastrophic hemolytic reactions. Clinicians should always suspect hemolysis when hypotension, dark urine, or unexplained bleeding occurs during transfusion. Additionally, transfusions should be used judiciously, as they carry significant risks despite their lifesaving potential.
