Coffee and Heart Disease

There are some research on people with heart and coffee drinkers can be used as a reference in making decisions.
Research in Canada
The study, published in the journal Epidemiology (Sept, 2006) showed that in some people, drinking coffee can trigger a heart attack within an hour after drinking it. Caffeine causes short-term increases in blood pressure and sympathetic nervous activity that could trigger a heart attack. The risk is highest among light coffee drinkers (those who consumed one cup a day maximum). For these people, the risk of heart attack increased fourfold. Moderate coffee drinkers (those who consumed two or three cups a day) had an increased risk of heart attack by 60% by drinking a cup of coffee. Effects of the lowest seen among heavy coffee drinkers (those who drank four or more cups per day). For them, drinking coffee does not seem to increase the risk of heart attack.
"For people who do not regularly drink coffee, drink coffee will cause a jolt of caffeine in the system (cardiovascular),”  said Ahmed El-Sohemy, PhD, a nutrition expert at the University of Toronto, Canada. "We know that caffeine causes transient increases in blood pressure, so they are not used to eat them would get wave increases are harmful to a fragile heart," he added. In a previous study published in the Journal of the American Medical Association (March, 2006), El-Sohemy says that certain people have a genetic variation that causes a slower caffeine metabolism, so the effect is increased risk of heart attack after consuming coffee. In those with a fast metabolism of caffeine, coffee actually beneficial for heart health.
Research in Italy and the U.S.
An Italian study has evaluated larger than 11,000 adults who reported heart attack in the previous three months and check out their coffee intake during the study period. Coffee consumption they are grouped as follows: at no time / almost not at any time, less than 2 cups per day, 2 to 4 cups per day, and greater than 4 cups per day. After more than three years, the risk of heart attack, death from heart attack and stroke is calculated based on the level of coffee consumption in the adult population who has suffered from heart. The results, published in the journal Circulation (Dec, 2007), suggesting that the walking relationship between coffee consumption and the risk of heart attack, death from heart attack or stroke.
For the record, the study was conducted on the Italians, who are accustomed to eating a Mediterranean diet and drinking coffee prepared by Italy. Most of the study participants drank coffee or espresso mocha, extracted from the ground coffee brewed hot water in a very short time.
In another study, followed by nearly 12,000 U.S. nurses with a history of heart disease or stroke, it is known that those who regularly drank effeminated coffee do not have a greater risk of death compared to non-coffee drinkers. The study which lasted more than 20 years was reported in the American Journal of Clinical Nutrition (May, 2011). The researchers found no association between coffee intake and risk of death from heart attack, stroke or other causes. It also applies to women who drank four or more cups per day.

Referring to the studies above, if you are a coffee addict who used to drink four cups of coffee or more a day, there is no reason to kick the habit after a heart attack. However, if you are only mild or moderate coffee drinkers, it seems more secure if you do not drink it anymore after getting a heart attack, especially if your blood pressure is not under control, and you are having heart palpitations, insomnia, and other problems after drinking coffee.