The idea that physical exercise could deplete our cardiac reserve has persisted for decades, but Australian research is now ...

Dr. Paul Friedman answers the question: 'Heart Block versus Artery Blockage?' — -- Question: I have been diagnosed with heart block. How does this differ from blockage in one of my arteries?

An abnormally fast heart rate can have numerous causes, such as anxiety, dehydration, caffeine or health conditions such as arrhythmia. Quick actions that engage the vagus nerve may slow it down. I ...