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Zorluk: KolayOrdering Imaging Studies

A 52-year-old woman is brought to the emergency department by emergency medical services after the sudden onset of a severe headache while lifting a heavy box. She describes the pain as "the worst headache of my entire life." The pain is diffuse and accompanied by severe nausea, one episode of vomiting, and sensitivity to light. Her medical history is significant for essential hypertension and tobacco use. Her temperature is 37.1°C (98.8°F), blood pressure is 182/105 mmHg, pulse is 98/min, and respirations are 18/min. On physical examination, the patient appears uncomfortable and keeps her eyes closed. There is mild resistance to passive neck flexion. Neurological examination is otherwise unremarkable with no focal motor or sensory deficits. Which of the following is the single most appropriate initial imaging study for this patient?

  1. Non-contrast computed tomography (CT) of the headCevap
  2. B
    Magnetic resonance imaging (MRI) of the brain without contrast
  3. C
    Computed tomography angiography (CTA) of the head and neck
  4. D
    Diagnostic digital subtraction cerebral angiography
  5. E
    Transcranial Doppler ultrasonography

Cevap

Non-contrast computed tomography (CT) of the head
This patient's sudden, severe 'thunderclap' headache, accompanied by meningismus (neck stiffness) and photophobia, represents the classic presentation of an acute subarachnoid hemorrhage (SAH). The most appropriate initial imaging study is a non-contrast head CT. It is highly sensitive (nearly 100%) for detecting acute SAH within the first 6 hours of symptom onset, can be completed rapidly, and is widely available in emergency settings. It effectively demonstrates acute blood in the subarachnoid space (such as the basal cisterns and sulci) without the confounding bright signal that intravenous contrast would create.

Adım Adım Çözüm

1
Identify the primary clinical presentation.
The patient presents with a sudden-onset "thunderclap" headache (worst of life), meningismus, and photophobia.
These findings are classic for an acute subarachnoid hemorrhage (SAH), most commonly caused by a ruptured berry aneurysm.
2
Determine the most appropriate initial diagnostic test for this specific condition.
A non-contrast head CT is selected as the first-line imaging modality.
Non-contrast CT is nearly 100% sensitive for detecting SAH within the first 6 hours, is rapidly performed, and allows for immediate triage and stabilization.

Anahtar Kavram

Initial imaging sequence for acute subarachnoid hemorrhage
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Ordering Imaging Studies

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