Heart sound 1 (S1) is the normal systolic heart sound. It is the first heart sound and is the "lubb" sound in lubb-dupp. The S1 sound is made when the mitral and tricuspid valves close ...

Atrial fibrillation (or "AFib"), which causes an irregular heart rhythm, affects far fewer Americans—recent estimates put it ...

Sinus rhythm (a.k.a. normal sinus rhythm) refers to the normal heart beat originating from the sinoatrial node. This is manifested as an upright P wave in lead II of the ECG. Sinus bradycardia ...

A S4 heart sound can be an important sign of diastolic heart failure or active ischemia and is rarely a normal finding. Diastolic heart failure frequently results from severe left ventricular ...

It's common to notice your heart beat faster after you eat. Your heart works harder to send ... You may notice your heartbeat more when you lie on your left side. Your heartbeat may sound louder if ...

Heart palpitations are heartbeats that suddenly become more noticeable. Palpitations can feel like the heart skips a beat, or it is pounding ... ultrasound that uses sound waves to create an ...

In music, the pulse is a special type of beat that is regular. It's the heartbeat of a piece of music and similar to a ticking clock. Have you ever wondered why people tap their foot or finger ...