Key result
Mitral commissurotomy normalizes phonocardiographic Q-1 and 2-OS intervals unless failure or incomplete relief persists.
Why the study?
The relationship between Q-1 and 2-OS intervals on phonocardiograms and mitral valve pathology including fibrosis, mitral orifice size, and left atrial pressure in mitral stenosis required re-evaluation.
How do phonocardiographic Q-1 and 2-OS intervals correlate with mitral orifice size and left atrial pressure in patients with mitral stenosis before and after operation?
Observational
How do phonocardiographic Q-1 and 2-OS intervals correlate with mitral orifice size and left atrial pressure in patients with mitral stenosis before and after operation?
Phonocardiographic 2-OS intervals reliably correlate with mitral orifice size and left atrial pressure in mitral stenosis, and can track postoperative recovery.
May refine noninvasive mitral stenosis assessment; leaves open validation against modern imaging.
Re-evaluation of Q-1 and 2-OS intervals and (Q-1)-(2-OS) index was attempted on preoperative phonocardiogram in mitral stenosis. Fibrosis of mitral value relates to Q-1 interval and this disturbs the correlation between Q-1 interval and the size of mitral orifice and left atrial pressure. 2-OS interval showed good correlation to the size of mitral orifice and left atrial pressure. The effect of fibrosis of mitral valve on this interval seems little. (Q-1)-(2-OS) index showed rough correlation to the size of mitral orifice but less correlation to left atrial pressure, probably due to fibrosis of mitral valve. Postoperative phonocardiograms reveal the clinical course of patient postoperatively and preoperative value of Q-1 and 2-OS intervals return toward normal value unless congestive failure or incomplete commissurotomy present.
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Minoru Shibuya (1961) conducted an observational in Mitral stenosis. Mitral valve operation vs. Preoperative state was evaluated on Phonocardiographic changes (Q-1 and 2-OS intervals). Postoperative phonocardiograms in mitral stenosis showed that Q-1 and 2-OS intervals return toward normal values unless congestive failure or incomplete commissurotomy is present.
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