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Emergency And Acute Medicine – Fibromyalgia
Basics Description
Fibromyalgia is a nonarticular, noninflammatory syndrome characterized by chronic, widespread musculoskeletal pain and heightened pain sensitivity to normally nonpainful stimuli (allodynia). It is more common in females and is associated with diffuse tenderness at multiple sites, fatigue, sleep disturbance, muscle stiffness, and cognitive difficulties involving attention and memory. Physical examination findings are often limited. Fibromyalgia is not a diagnosis of exclusion and may coexist with other rheumatologic or medical conditions.
Etiology
The underlying mechanism is believed to involve central pain processing abnormalities, with increased activity of pronociceptive pathways and reduced activity of antinociceptive pathways in the brain and spinal cord. Identified contributors include elevated substance P levels and decreased biogenic amines such as norepinephrine, serotonin, and dopamine. Reduced gray matter volume in certain brain regions has also been described. A genetic predisposition is suggested, with approximately one third of patients having an affected first-degree relative; candidate genes include those related to serotonin and dopamine pathways. Psychological factors are common, and many patients have comorbid psychiatric conditions. In susceptible individuals, fibromyalgia may be triggered by physical trauma, illness, inflammation, or chronic stress, with hypothalamic–pituitary–adrenal axis dysfunction often preceding symptom onset.
Diagnosis Signs And Symptoms
Patients report widespread pain involving both sides of the body, above and below the waist, and the axial skeleton, persisting for more than three months. Common associated symptoms include morning stiffness, generalized weakness, persistent fatigue not relieved by rest, sleep disturbance, muscle spasms, paresthesias, impaired concentration or memory, headaches, gastrointestinal discomfort relieved by bowel movements, pelvic or bladder discomfort, jaw or facial pain, and mood disturbances. Physical examination is typically unremarkable aside from tenderness at characteristic sites.
Essential Workup
History is the most important diagnostic tool. In the emergency department, evaluation is primarily focused on distinguishing chronic fibromyalgia pain from acute pain due to trauma, injury, or new medical conditions. If diagnostic confirmation is required, American College of Rheumatology criteria may be applied, including widespread pain for at least three months with either tender point assessment or use of the Widespread Pain Index (WPI) and Symptom Severity (SS) scale. Tender points are classically located at bilateral sites including the occiput, low cervical region, trapezius, supraspinatus, second rib, lateral epicondyle, gluteal region, greater trochanter, and medial knee fat pad.
Diagnosis Tests And Interpretation
Laboratory testing is not diagnostic and should be reserved for exclusion of alternative or acute conditions. Studies may include CBC, basic chemistries, ESR, muscle enzymes, thyroid function tests, and urinalysis when clinically indicated. Imaging and invasive procedures are not routinely useful and should only be performed to evaluate suspected alternative diagnoses.
Differential Diagnosis
Conditions to consider include myofascial pain syndrome, chronic fatigue syndrome, major depression, polymyalgia rheumatica, Lyme disease, hypothyroidism, collagen vascular diseases, electrolyte abnormalities, metabolic or drug-induced myopathies, osteomalacia, spondyloarthropathies, interstitial cystitis, and urinary tract infection.
Treatment
Emergency department management focuses on patient education, reassurance, and exclusion of acute pathology. Patients should be informed that fibromyalgia is chronic but not life-threatening, deforming, or associated with reduced life expectancy. Long-term management aims to reduce pain and improve function and requires outpatient follow-up. Pharmacologic therapy with central nervous system–acting agents is most effective, including gabapentin, pregabalin, tricyclic antidepressants, and serotonin–norepinephrine reuptake inhibitors. Opioids are not recommended and may worsen long-term pain. NSAIDs and corticosteroids have not demonstrated benefit. Local injections into tender points remain controversial due to lack of strong evidence.
Medication
Acetaminophen 650 mg PO q4h. Amitriptyline 25–50 mg PO at bedtime. Cyclobenzaprine 5–10 mg PO TID. Duloxetine 60 mg PO daily or BID. Gabapentin starting at 300 mg PO TID with gradual titration. Milnacipran starting at 12.5 mg daily and titrated to 50–100 mg PO BID. Pregabalin starting at 50 mg PO TID, titrated to a maximum of 450 mg/day. Tramadol may be used as an adjunct in selected patients.
Follow Up Disposition
Patients with uncomplicated fibromyalgia can be discharged with outpatient follow-up. Admission is reserved for those with serious underlying disease, intractable pain, immunocompromised status, or suicidal ideation.
Follow Up Recommendations
Patients should be referred to a primary care provider, rheumatologist, or pain specialist for ongoing management. Gradual aerobic exercise programs are encouraged, along with sleep hygiene measures such as regular sleep schedules and avoidance of caffeine in the evening. Stress management strategies and cognitive-behavioral therapy can provide sustained benefit.
Practical Takeaways And Frequent Missteps
Careful distinction between chronic fibromyalgia symptoms and new or acute pain is essential, as patients may still develop unrelated emergent conditions. Avoid unnecessary diagnostic testing once acute pathology has been excluded, and avoid opioid prescribing, which may worsen long-term outcomes.
Basics Description
Fibromyalgia is a nonarticular, noninflammatory syndrome characterized by chronic, widespread musculoskeletal pain and heightened pain sensitivity to normally nonpainful stimuli (allodynia). It is more common in females and is associated with diffuse tenderness at multiple sites, fatigue, sleep disturbance, muscle stiffness, and cognitive difficulties involving attention and memory. Physical examination findings are often limited. Fibromyalgia is not a diagnosis of exclusion and may coexist with other rheumatologic or medical conditions.
Etiology
The underlying mechanism is believed to involve central pain processing abnormalities, with increased activity of pronociceptive pathways and reduced activity of antinociceptive pathways in the brain and spinal cord. Identified contributors include elevated substance P levels and decreased biogenic amines such as norepinephrine, serotonin, and dopamine. Reduced gray matter volume in certain brain regions has also been described. A genetic predisposition is suggested, with approximately one third of patients having an affected first-degree relative; candidate genes include those related to serotonin and dopamine pathways. Psychological factors are common, and many patients have comorbid psychiatric conditions. In susceptible individuals, fibromyalgia may be triggered by physical trauma, illness, inflammation, or chronic stress, with hypothalamic–pituitary–adrenal axis dysfunction often preceding symptom onset.
Diagnosis Signs And Symptoms
Patients report widespread pain involving both sides of the body, above and below the waist, and the axial skeleton, persisting for more than three months. Common associated symptoms include morning stiffness, generalized weakness, persistent fatigue not relieved by rest, sleep disturbance, muscle spasms, paresthesias, impaired concentration or memory, headaches, gastrointestinal discomfort relieved by bowel movements, pelvic or bladder discomfort, jaw or facial pain, and mood disturbances. Physical examination is typically unremarkable aside from tenderness at characteristic sites.
Essential Workup
History is the most important diagnostic tool. In the emergency department, evaluation is primarily focused on distinguishing chronic fibromyalgia pain from acute pain due to trauma, injury, or new medical conditions. If diagnostic confirmation is required, American College of Rheumatology criteria may be applied, including widespread pain for at least three months with either tender point assessment or use of the Widespread Pain Index (WPI) and Symptom Severity (SS) scale. Tender points are classically located at bilateral sites including the occiput, low cervical region, trapezius, supraspinatus, second rib, lateral epicondyle, gluteal region, greater trochanter, and medial knee fat pad.
Diagnosis Tests And Interpretation
Laboratory testing is not diagnostic and should be reserved for exclusion of alternative or acute conditions. Studies may include CBC, basic chemistries, ESR, muscle enzymes, thyroid function tests, and urinalysis when clinically indicated. Imaging and invasive procedures are not routinely useful and should only be performed to evaluate suspected alternative diagnoses.
Differential Diagnosis
Conditions to consider include myofascial pain syndrome, chronic fatigue syndrome, major depression, polymyalgia rheumatica, Lyme disease, hypothyroidism, collagen vascular diseases, electrolyte abnormalities, metabolic or drug-induced myopathies, osteomalacia, spondyloarthropathies, interstitial cystitis, and urinary tract infection.
Treatment
Emergency department management focuses on patient education, reassurance, and exclusion of acute pathology. Patients should be informed that fibromyalgia is chronic but not life-threatening, deforming, or associated with reduced life expectancy. Long-term management aims to reduce pain and improve function and requires outpatient follow-up. Pharmacologic therapy with central nervous system–acting agents is most effective, including gabapentin, pregabalin, tricyclic antidepressants, and serotonin–norepinephrine reuptake inhibitors. Opioids are not recommended and may worsen long-term pain. NSAIDs and corticosteroids have not demonstrated benefit. Local injections into tender points remain controversial due to lack of strong evidence.
Medication
Acetaminophen 650 mg PO q4h. Amitriptyline 25–50 mg PO at bedtime. Cyclobenzaprine 5–10 mg PO TID. Duloxetine 60 mg PO daily or BID. Gabapentin starting at 300 mg PO TID with gradual titration. Milnacipran starting at 12.5 mg daily and titrated to 50–100 mg PO BID. Pregabalin starting at 50 mg PO TID, titrated to a maximum of 450 mg/day. Tramadol may be used as an adjunct in selected patients.
Follow Up Disposition
Patients with uncomplicated fibromyalgia can be discharged with outpatient follow-up. Admission is reserved for those with serious underlying disease, intractable pain, immunocompromised status, or suicidal ideation.
Follow Up Recommendations
Patients should be referred to a primary care provider, rheumatologist, or pain specialist for ongoing management. Gradual aerobic exercise programs are encouraged, along with sleep hygiene measures such as regular sleep schedules and avoidance of caffeine in the evening. Stress management strategies and cognitive-behavioral therapy can provide sustained benefit.
Practical Takeaways And Frequent Missteps
Careful distinction between chronic fibromyalgia symptoms and new or acute pain is essential, as patients may still develop unrelated emergent conditions. Avoid unnecessary diagnostic testing once acute pathology has been excluded, and avoid opioid prescribing, which may worsen long-term outcomes.
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