ArticleClinical practice and cases in emergency medicine2025
Report of Two Cases: Altered Mental Status and Anisocoria as Presenting Symptoms in Acute Basilar Artery Occlusion.
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Abstract
introductionA posterior circulation stroke at the level of the basilar artery can cause ischemia to the brainstem, cerebellum, and occipital lobes. Posterior circulation strokes are notoriously more difficult to clinically diagnose than anterior circulation strokes, with a variety of presenting symptoms including altered mental status, dizziness, vision changes, nausea, and vomiting. Anisocoria has been reported to occur in rare cases. CASE REPORT: We present two cases where patients had an acute episode of altered mental status with a key exam finding of anisocoria, or unequal pupil sizes. The combination of anisocoria and acute mental status decline are classically associated with traumatic brain injury, increased intracranial pressure, or both. In each of the two cases presented, acute basilar artery occlusion was seen on computed tomography with angiography.
conclusionWhen presented with acute decline in mental status and anisocoria, early clinical suspicion of an acute basilar artery occlusion is crucial in diagnosing and managing these patients with debilitating acute posterior stroke. Time-sensitive interventions such as thrombolytics and mechanical thrombectomy can be lifesaving.
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