Having a heart rate that's too high is called tachycardia. In general, tachycardia means having a heart rate that is above 100 bpm. Tachycardia can be dangerous but is not always. Having a higher ...

A heart arrhythmia is an irregular heartbeat, which means it can be too quick, slow, or beat with an abnormal rhythm.

Heart palpitations without other symptoms may be related to anxiety or too much caffeine. If you’re unsure, read on to learn ...

In a sample of people who regularly use ecstasy and other illicit stimulants, 54% reported using pharmaceutical stimulants ...

If you’ve ever woken up with a rapid heart rate after a night of drinking, you are not alone. This article explains why it ...

Use of ultra-short-acting β-blockers (esmolol or landiolol) for persistent tachycardia in patients with sepsis may not reduce mortality.

This is called, aptly, obstructive hypertrophic cardiomyopathy. This kind of obstruction is behind many of the more ...

The heart is a muscle that contracts to work as a pump. When it contracts it pushes blood containing oxygen and nutrients to ...

IN patients with atrial arrhythmias the ventricular rate is primarily determined by the frequency of atrial-impulse generation and the functional refractory period of the atrioventricular node.

A recent study from Kennedy Krieger Institute shows that the majority of children diagnosed with long COVID are likely to ...

or extreme tachycardia (heart rate >250 bpm) represent clinical limitations and may invalidate ICG measurements.

Postural Orthostatic Tachycardia Syndrome (POTS) can cause dizziness, fatigue, and lightheadedness in patients. Doctors are ...