A 60-year-old man fell unconscious in a parking lot. He remembers getting out of his car but does not remember any other events. He felt mildly dizzy before and after the event. He has a history of hypertension well controlled with hydrochlorothiazide. Now, he is awake and alert. ECG shows sinus tachycardia. Which of the following is the most likely diagnosis?
Sick sinus syndrome
Transient ischemic attack
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