A 68-year-old man with atrial fibrillation presents with sudden-onset right-sided weakness and aphasia. Non-contrast CT head is unremarkable. ECG shows irregularly irregular rhythm, and INR is subtherapeutic.
What is the most appropriate next step in management?
A. Repeat CT head in 24 hours
B. Start high-dose aspirin
C. Obtain MRI brain with DWI
D. Begin heparin infusion immediately
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