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Headache: Headache Emergencies.

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Severe headaches in the ED are often primary, but serious conditions like subarachnoid hemorrhage (SAH) and reversible cerebral vasoconstriction syndrome (RCVS) require prompt diagnosis. Early detection is key for appropriate management and patient outcomes.

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Area of Science:

  • Neurology
  • Emergency Medicine

Background:

  • Most severe, sudden-onset headaches in the emergency department (ED) are primary (e.g., migraine).
  • Serious underlying pathology is present in only 10-15% of patients.
  • Guidelines prioritize detecting subarachnoid hemorrhage (SAH) and cerebrovascular conditions.

Purpose of the Study:

  • To highlight the importance of recognizing Reversible Cerebral Vasoconstriction Syndrome (RCVS) in severe headache evaluations.
  • To outline diagnostic approaches for various causes of severe headache in the ED.

Main Methods:

  • Review of diagnostic guidelines for severe headache.
  • Emphasis on clinical features, risk factors, and red flag signs.
  • Discussion of imaging (CT, MRI/MRA) and lumbar puncture utility.

Main Results:

  • Reversible Cerebral Vasoconstriction Syndrome (RCVS) is often unrecognized and may be as common as SAH.
  • Abnormal neurologic findings have a 39% positive predictive value for intracranial pathology.
  • CT scans are sensitive for SAH within 6 hours; lumbar puncture aids in specific cases.

Conclusions:

  • Accurate diagnosis of severe headache etiology is crucial for appropriate management and prognosis.
  • RCVS should be considered in the differential diagnosis of thunderclap headaches.
  • Diagnostic strategies should be tailored to suspected pathologies, including SAH, RCVS, and meningitis.