Non-invasive observations on initial low frequency vibrations of the first heart sound--correlation with the 'presystolic' murmur in mitral stenosis.

AUTOR(ES)

Armstrong, T G

RESUMO

The initial low frequency component of the first heart sound, 'M', has been studied in normal subjects, and in patients with vario-s prosthetic mitral valves and with mitral stenosis, using simultaneous low frequency phonocardiography, echocardiography, and apex cardiography. The techniques showed 'M' to have a constant morphology in preisovolumic systole. In mitral stenosis, 'M' and the preisovolumic 'presystolic' murmur appear to be the same phonocardiographic phenomenon. While 'M' was present in sinus rhythm, augmentation of this normal vibration occurred particularly during the short cycles of atrial fibrillation. Leaflet coaption and movement of the ventricular wall as detected echocardiographically do not appear to play a role in its pathogenesis but the sound could emanate from the ventricular wall as it tautens and decreases its compliance at the onset of systole.

Documentos Relacionados

• Initial low frequency vibrations of the first heart sound.
• Mechanism of diastolic rumble and presystolic murmur in mitral stenosis.
• Haemodynamic and sound events preceding first heart sound in mitral stenosis.
• Non-invasive pulsed Doppler study of mitral stenosis and mitral regurgitation: preliminary study.
• Movement of mitral valve cusps in relation to first heart sound and opening snap in patients with mitral stenosis.