A new study shows that the sinoatrial node (SAN) -- a small but powerful structure in the human heart that serves as its natural pacemaker and initiates every normal heartbeat -- runs on different ...

The heart is the body's hardest-working muscle. Whether you're awake or asleep, or exercising or resting, your heart is always at work. It pumps blood through arteries to deliver oxygen to organs and ...

For decades, doctors have observed that women generally have faster heartbeats than men, while men are more likely to develop irregular rhythms like atrial fibrillation (AFib). A new study from The ...

It’s normal to experience occasional heart palpitations due to stress, exercise, and excessive caffeine or stimulants. Write down what you were doing before your heart started racing. This record can ...

If you're new to the world of POTS, whether that's because of its newfound connections with Long COVID-19, or its recent momentum on social media, you've probably come across the long list of symptoms ...

A normal resting heart rate ranges from 60 to 100 bpm. Sudden increases can be triggered by stress, dehydration, or stimulants, says a heart specialist. Have you ever experienced a sudden increase in ...

The human heart beats roughly 3 billion times during the course of an average lifetime. Every single time it beats, blood is drawn into its two upper chambers, held there briefly by a network of ...

Johns Hopkins Medicine scientists who arranged for 48 human bioengineered heart tissue samples to spend 30 days at the International Space Station report evidence that the low gravity conditions in ...