Strong first heart sound: signs, symptoms and causes

2021-08-28 10:21 PM

Normally, the leaflets of the mitral and tricuspid valves have time to move toward each other before the heart contracts. With a short PR interval, these leaves are still far apart at the time the heart begins to contract, so they produce a very strong closing sound from a long distance and make T1 strong

Image. Heart sounds and the cardiac cycle

Description

The first heart sound closes louder than usual.

Cause

Short PR interval.

Mild leaf stenosis.

Increase cardiac output.

Mechanism

Short PR interval

Normally, the leaflets of the mitral and tricuspid valves have time to move toward each other before the heart contracts. With a short PR interval, these leaves are still far apart at the time the heart begins to contract, so they produce a very strong closing sound from a long distance and make T1 strong.

Mild mitral stenosis

In mild mitral stenosis, a large pressure gradient between the atria and ventricles causes the mitral valve to stay open for a long time. And they also close strongly from a distance at the onset of systole.

Increase cardiac output

In increased cardiac output (ischemic tachycardia), diastole is shortened and the mitral and tricuspid valves close from a greater distance than normal.

Significance

There are few studies on the value of strong T1.

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