Solve with reason
Answer: A) Cardioembolic stroke
Reasoning
Key Clinical Clues
| Finding | Significance |
|---|---|
| 26-year-old woman | Young patient — atypical for atherosclerotic stroke |
| Left-sided hemiparesis (2 hours) | Acute focal neurological deficit → ischemic stroke territory |
| Pulse 98/min, irregularly irregular | Classic descriptor for atrial fibrillation (AF) |
Why Cardioembolic?
An irregularly irregular pulse is the hallmark of atrial fibrillation. In AF, the chaotic atrial activity causes blood stasis — particularly in the left atrial appendage — leading to thrombus formation. That thrombus can dislodge, travel to the cerebral circulation, and cause sudden embolic occlusion of a large vessel (e.g., MCA), producing abrupt-onset focal deficits like hemiparesis.
This is the classic mechanism: AF → left atrial thrombus → cerebral embolism → stroke.
Why Not the Others?
- B) Thrombotic stroke — caused by in-situ atherosclerotic plaque rupture. Rare in a 26-year-old with no vascular risk factors mentioned; typically occurs in older patients with hypertension, diabetes, or hyperlipidemia.
- C) Lacunar stroke — small vessel occlusion deep in the brain (basal ganglia, internal capsule, pons). Associated with chronic hypertension and diabetes over years; does NOT explain the arrhythmia.
- D) Hemorrhagic stroke — caused by vessel rupture (hypertension, AVM, aneurysm). Would not produce an irregularly irregular pulse as a causal link, and the scenario implies ischemia.
Bottom Line
The irregularly irregular pulse is the pivot of this question. It points unambiguously to atrial fibrillation, which is the single most common cause of cardioembolic stroke. Even in young patients, AF (whether paroxysmal, structural, or from conditions like mitral stenosis/rheumatic heart disease — common in young women in some populations) causes large-artery occlusion via embolism.
Answer: A — Cardioembolic stroke
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