On the grounds that there is no conclusive evidence that coffee is a risk factor for coronary heart disease, there seems to be no reason to advise coffee drinkers to switch to decaffeinated coffee as a means of lowering the risk of a heart attack. There may of course be other reasons to switch. One reason is that caffeine causes palpitations (skipped heart beats) in some people, and if you experience these, it may be worth switching to decaffeinated coffee. Switching to decaffeinated coffee may lower your blood pressure, but only by a marginal amount.