yer friends dickie ticker means it doesn't pump blood efficiently...poorly circulating blood in the heart can swearl around and clot up and make you more likely to throw a blockage in the lungs as a pulmonary embolism, the brain as a stroke, or the heart as a myocardial infarction
Now I'm not a doctor so how bad the arrhythmia is and how much blood thinners help cover your ass is a complete crap shoot (not to mention how much of a dumb ass he most likely will be with fluid balance, blood pressure, and hematocrit)...id take a Bayer aspirin everyday tho if his doctor didn't out him on one already...like sully said, no one is a doctor, or omnipotent lol