What is the mechanism of presystolic accentuation of the murmur ?
In sinus rhythm it is due to the atrial systole which increases flow across the stenotic valve from the left atrium to the left ventricle; this causes accentuation of the loudness of the murmur. This may also be seen in atrial fibrillation and is explained by the turbulent flow caused by the mitral valve starting to close with the onset of ventricular systole. This occurs before the first heart sound and gives the impression of falling in late diastole; it is, however, due to the start of ventricular systole.
Lexo edhe:
In sinus rhythm it is due to the atrial systole which increases flow across the stenotic valve from the left atrium to the left ventricle; this causes accentuation of the loudness of the murmur. This may also be seen in atrial fibrillation and is explained by the turbulent flow caused by the mitral valve starting to close with the onset of ventricular systole. This occurs before the first heart sound and gives the impression of falling in late diastole; it is, however, due to the start of ventricular systole.
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