Heart murmur: caused by damage to the valve

2021-04-29 04:15 PM

The graphs show how the intensity of the murmur changes throughout the different parts of the diastolic and systolic tenses. The relative timing of each blow is also obvious.

As indicated by the heart sound recorder in the picture, many abnormal heart sounds, called heart murmur, occur when heart valve abnormalities exist.

The systolic murmur of aortic stenosis

In people with aortic stenosis, blood is pushed from the left ventricle through a tiny fibrotic opening of the aortic valve. This is because to withstand the ejection, sometimes left ventricular blood pressure rises to as high as 300mmHg, while aortic pressure remains normal. Thus, a nozzle effect is produced during systole, with a strong influx of blood at a very high velocity through the small pores of the valve. This phenomenon causes serious chaos of blood in the base of the aorta. Dilated blood has an antagonistic effect on the aortic wall, causing intense vibrations, and loud murmurs occur during systole and are transferred smoothly above the thoracic aorta and even the large arteries of the neck. . The sound is rough, and in very narrow people it is very loud, very loudly heard towards the patient's feet. Besides,

Figure. The heart's heart recording was normal and injured

Diastolic murmur of aortic opening

In aortic regurgitation, no abnormal sounds are heard during the systolic, but during the time the diastolic spits back up due to high aortic pressure in the left ventricle, causing a " high-pitched "blow" sounds like a boom and is best heard in the left ventricle. The result of this "blow" comes from the turbulence of blood rushing to hit the low-pressure blood in the left ventricular diastole.

Systolic murmur of mitral regurgitation

In people with mitral regurgitation, blood backs up from the mitral valve back into the left atrium during systole. This reflux produces a high-frequency blow, whooping sound similar to aortic reflux but occurs during systole rather than diastole. It is most strongly infused into the left atrium. However, the left atrium is deep into the chest, so it is difficult to hear the sound directly on the atrium. As a result, the sound of reflux travels to the chest wall mainly in the apex of the left ventricle.

Diastolic murmur of mitral stenosis

In people with mitral stenosis, blood flowing through the narrowed mitral valve is difficult to get from the left atrium to the left ventricle, and because the pressure in the left atrium is less likely to increase above 30 mmHg, a large difference in forced pressure. blood from the left atrium to the left ventricle did not increase. As a result, the abnormal sounds in the mitral stenosis are usually weak and the frequency is very low, so most of the sound frequency spectrum is below the threshold of human hearing.

During the first part of the diastole, the left ventricle with the mitral stenosis has very little blood in it and the wall of the left ventricle expands so that blood does not cause a concussion between the walls of the ventricles. For this reason, even in people with severe mitral stenosis, no contraction of the blow can be heard during the first three tenses of diastole. Then, after partial filling, the ventricles last long enough for the blood to return and produce low rumbling noise.

Blowing the mitral valve on the heart recorder

B, C, D, and E cardiac tone graphs in the respective figures, ideal from patients with aortic stenosis, mitral regurgitation, aortic regurgitation, and mitral stenosis. It is clear from these cardiac graphs that aortic stenosis lesions cause the loudest murmur, and mitral stenosis damage is the weakest. The graphs show how the intensity of the murmur changes throughout the different parts of the diastolic and systolic tenses. The relative timing of each blow is also obvious. Note in particular that the murmur of aortic stenosis and mitral regurgitation occurs only during systole, while the murmur of aortic regurgitation and mitral stenosis occurs only during systole. diastolic.



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