What Is Presystolic Heart Murmur?


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Heart murmur can be defined as abnormal heart sounds that can be detected through a stethoscope. Heart murmur is often an indication of an abnormality in the functioning of the heart, especially of the heart valves. The murmur sound is produced by turbulent blood flow through the heart valves. The most common causes for abnormality in the blood flow are narrowing of the valves, leaking, and abnormal passages.

Heart murmur is classified into different categories bases on six parameters. The parameters for classification of heart murmur are intensity, pitch, configuration or shape, quality of the sound, duration of the murmur, and timing of the heart murmur when compared with a normal cardiac cycle.

Presystolic murmur can be defined as a cardiac murmur that occur just before ventricular ejection and caused by atrial contraction.

Presystolic murmur of the heart is also called Late Diastolic murmur. Presystolic heart murmurs have a crescendo configuration. These murmurs start after S2 and generally extend up to S1. Presystolic heart murmur is often caused by tricupsid stenosis, mitral stenosis, myxoma, or a total heart block.

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