[The value of myocardial mass determination in the evaluation of left ventricular functional value in chronic mitral insufficiency. Apropos of 44 cases].
The functional value of the left ventricle in chronic mitral incompetence, determined as a function of haemodynamic and angiocardiographic indices, has now become a difficult factor to determine because of the multiplicity of indices which exist, and because of disagreement about the pathological values which are often a function of the valvular pathology in the particular case. Moreover, the importance of myocardial hypertrophy is rarely taken into account. The ratio systolic work/myocardial mass (WS/WM) which lies between no limits in the normal subject (0.81+/-0.03 gm.g-1) has allowed us to classify 44 patients with chronic mitral incompetence into three groups: groupe I (WS/V(M) greater than 0.87 gm.g-1), characterised by an increase in WS proportionally superior to that of V(M) (hyperfunctional); group II (0.87 gm.g-1 larger than or equal to WS/V(M) larger than or equal to 0.75 gm-1), characterised by a parallel increase of mass and WS (isofunctional); group III (WS/V(M) less than 0.75 gm.g-1) in which the increase in mass is proportionally greater than the variation in WS (hypofunctional). A comparison between the selectivity of this relationship and that of other indices, which contain large areas of overlap between the various groups of patients, lead us to hope for a prognostic index which will take account of the myocardial mass and of the pump action of the left ventricle.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002302:Cardiac Output; D002306:Cardiac Volume; D006332:Cardiomegaly / Q000503:physiopathology; D002648:Child; D002675:Child, Preschool; D002908:Chronic Disease; D002932:Cineangiography; D006352:Heart Ventricles / Q000000981:diagnostic imaging / Q000503:physiopathology*; D006801:Humans; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000503:physiopathology*; D009200:Myocardial Contraction
Intérêt de la mesure de la masse myocardique dans l'évaluation de la valeur fonctionnelle du ventricule gauche de l'insuffisance mitrale chronique. A propos de 44 cas.