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189.

A 75-year-old female patient with persistent atrial fibrillation suddenly experienced right-sided paresis with aphasia. The patient has not been treated with anticoagulants. What should you do first?

A. take a head CT scan with contrast.
B. take a non-contrast head CT scan.
C. determine the glucose concentration.
D. administer tissue plasminogen activator.
E. administer heparin.

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