Many people perhaps think that drinking coffee may lead to abnormality heartbeat and most doctor agree with that. However, there is no strong data showing those correlation.
In fact, drinking coffee may reduce hospitalized caused by cardiac dysrhythmia or arrhythmia which is characterized by the heartbeat become faster or slower.

The findings recently announced by Dr. Arthur Klatsky from Kaiser Permanente Division of Research, Oakland, CA.
Dr. Klatsky said, “We went into this study thinking there would be no association, but to our surprise, there was actually an inverse relationship. It could be protective, although one observational study doesn’t prove anything yet.”

From the study involved 130054 participants in in the Kaiser Permanente health plan with have several adjusting of BMI, blood pressure, total cholesterol, and other measurements, the researcher found;

- Drinking more than 4 cups of coffee per day had 18% lower risk of hospitalized associated with arrhythmia both men and women, smoker and non-smoker, and ethnic group.

For the decaffeinated coffee, Dr. Klatsky found NO protective effect, and suggested protective source from caffeine including effect of antioxidant which well known recently.

Dr. Klatsky and team still unclear about the mechanism as he said that coffee have complex substance.
However the researcher speculated that caffeine competes with adenosine in brain, so it might also compete with adenosine in the heart by attenuated rhythm problem from adenosine function and effect (as conduction and recovery of heart muscle cell after depolarization that can affect to shortening refractory period).

Although this finding need to be confirmed other studies and no harm risk for coffee possibility to protect the heart, Dr. Klatsky said, “It might be a little tricky to get people to give up their coffee, and for those who aren’t coffee drinkers, it might be thought to get them to start drinking four cups per day.”