[Study of left ventricular function in valvular cardiopathies (mitral insufficiency and aortic insufficiency].
A study of the left ventricular function based on the haemodynamic data combined with those provided by biplane cineangiography was performed in 35 cases with left ventricular volume overload (20 cases of mitral incompetence and 15 of aortic insufficiency). The importance of the haemodynamic changes and of the adaptation mechanisms set up were described. The more intense dilatation-hypertrophy of aortic incompetence than of mitral incompetence plays an essential part. The role of Starling's mechanism is underlined. Estimation of the contractile value of the myocardium, taken into account the mechanical overload and the conditions of late-diastolic lengthening of the fibre and of impedance to left ventricular ejection was determined. An obvious myocardial failure, demonstrated in approximately one third of the cases, by determination of some contractility indices estimated in the ejection phase, Vf sigma max in particular, the only one valid in the presence of valvular regurgitation. In the other cases, the moderate decrease of myocardial contractility was masked by compensatory mechanisms.
D000293:Adolescent; D000328:Adult; D000368:Aged; D001022:Aortic Valve Insufficiency / Q000503:physiopathology*; D001794:Blood Pressure; D006328:Cardiac Catheterization; D002302:Cardiac Output; D002306:Cardiac Volume; D002932:Cineangiography; D003287:Contrast Media; D004106:Dilatation; D005260:Female; D006334:Heart Function Tests; D006352:Heart Ventricles / Q000503:physiopathology*; D006801:Humans; D006984:Hypertrophy; D008297:Male; D008875:Middle Aged; D008944:Mitral Valve Insufficiency / Q000503:physiopathology*; D009200:Myocardial Contraction
D003287:Contrast Media
Etude de la fonction ventriculaire gauche dans les cardiopathies valvulaires (insuffisance mitrale et Insuffisance aortique)