Could Taking Viagra Cause Heart Problems?

I'm 78 yrs. old. 5ft10ins. 172lbs. Over last 2 years I took viagra many times without side-effects, apart from facial flushing. Last time I took it I got rapid heartbeats (120 per minute) about 45 minutes afterward, lasting a half -hour. This was before sexual intercourse. After heart rate returned to normal sexual intercourse took place, without ill effects. I had a heart attack 12 years ago. I'm on a statin and mini-dose aspirin. I go for lengthy walks and play golf regularly and am an enthusiastic member of a male choir. Really, I enjoy good health. Is there any reason why I should not take viagra again?