A 65-year-old man with a history of hypertension and atrial fibrillation is brought to the emergency department after experiencing a sudden onset of right-sided weakness and expressive aphasia that started 45 minutes ago. His vital signs show a blood pressure of 170/90 mmHg, heart rate of 95/min, and oxygen saturation of 98% on room air. Neurological examination confirms a dense right hemiparesis and impaired speech production. Arrange the following neuroimaging modalities in the standard sequential order for the acute evaluation and subsequent inpatient management of this patient, starting with the most immediate initial study.
- 1Noncontrast computed tomography (CT) of the head
- 2Computed tomography angiography (CTA) of the head and neck
- 3Magnetic resonance imaging (MRI) of the brain
Cevap
The correct sequence of neuroimaging in acute ischemic stroke is initial noncontrast CT of the head, followed by CTA of the head and neck, and subsequently MRI of the brain.
The evaluation of an acute stroke follows a strict, time-sensitive sequence. Noncontrast CT of the head is the mandatory first step because it rapidly and accurately detects acute intracranial hemorrhage, which determines whether thrombolytics can be safely administered. Once hemorrhage is ruled out, a CT angiography (CTA) is immediately obtained to detect large vessel occlusions (LVO) in the anterior or posterior circulation that would necessitate endovascular mechanical thrombectomy. Finally, after the acute management window has passed, an MRI of the brain is obtained (usually within 24-48 hours) to definitively evaluate the infarct core, identify microhemorrhages, and clarify the stroke mechanism.
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Anahtar Kavram
The standard sequence of imaging in suspected acute stroke prioritizes rapidly ruling out hemorrhage, followed by vascular imaging for interventional planning, and later definitive parenchymal imaging.