Which diagnostic imaging modality is the first-line emergency study for acute neurological evaluation to differentiate ischemic stroke from acute intracerebral hemorrhage?
Answer and explanation
Correct answer: C. Non-contrast head Computed Tomography (CT)
- Step 1: In patients presenting with acute focal neurological deficits, immediate neuroimaging is required to differentiate ischemic stroke from acute intracerebral hemorrhage prior to considering intravenous thrombolytic therapy.
- Step 2: Emergency non-contrast head Computed Tomography (CT) is the first-line gold standard imaging modality because it is widely accessible, extremely fast, and highly sensitive for excluding acute intracranial hemorrhage.
Answer
Non-contrast head Computed Tomography (CT).
Why not the others: Brain MRI with diffusion sequences takes significantly longer in emergency triage, carotid duplex evaluates extracranial carotid stenosis, and transesophageal echocardiography evaluates cardiac embolic sources.
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