[Normalized median velocity of circumferential fiber lengthening studied with ultrasonics. III. Comparison with the normalized protodiastolic median "velocity" of the posterior wall]. FT Studio della velocita media normalizzata di allungamento circonferenziale della fibra mediante ultrasuoni. Nota III-Confronto con la "velocita" media protodiastolica normalizzata della parete posteriore

Both mitral valve closing speed (MVV) and the mean standardized circumferential lengthening of the myocardial fibrocell (MVCL), between which a good correlation exists, may be used as indirect indices of ventricular compliance. These two indices have been compared with those obtained echocardiographically from the movement of the posterior wall of the ventricle in a group of normal subjects and in a group suffering from hypertrophic subaortic stenosis (IHSS). The comparison between MVCL and mean standardized speed of protodiastolic prolapse of the posterior wall (Wpwd) was fairly significant (P=0.01); that between MVCL and mean speed of protodiastolic prolapse of the posterior wall (DEV) was only slightly significant (P=0.05) or was not significant at all; that between MVCL and the maximum speed of protodiastolic release (DEVM) was slightly significant (P=0.05). Although the correlation between MVV and the various indices obtained from the movement of the posterior wall (DEV, DEVM, Vpwd) were quite significant (P=0.01), it is considered that Vpwd is preferable as an indirect index of ventricular compliance. As it is capable of distinguishing subjects with IHSS from normal subjects inthose cases in which the movement of valvular peaks, modified or impeded by inflammatory or fibrotic processes does not a-low MVV to be measured, we think Vpwd can be usefully employed as it can in all those circumstances in which it is impossible to measure MVCL owing to alterations to normal septal synchronism (infarction and fibrosis of the septum, branch blocks, etc.).