[Measurement of mitral flow at the extremity of the valves. Validation of a simplified method based on 101 cases].
The measurement of cardiac output at the extremity of the mitral cusps, by Doppler-echocardiography, is of fundamental value, in particular for the evaluation of valve regurgitation. However, it comes up against a theoretical difficulty resulting from constant variation in the surface area of this orifice during diastole. After reviewing the main measurement methods available in the literature, a simplified method based upon the diameter of the ring and calculation of a mean diastolic intercusp distance by TM is suggested. Evaluation of this technique in 101 patients free of valve of leak showed its feasibility to be close to 100% and the correlation with aortic (r = 0.90), pulmonary (r = 0.91) and mitral ring (r = 0.88) outputs was entirely satisfactory. Our method would thus seem to be a good compromise between digitalised integration methods for the measurement of mitral surface area--optimal but complex--and the aim of simplification compatible with routine clinical use.
Denis
B
B
Clinique Cardiologique et Urgences Cardiologiques, CHU, Grenoble.
Vanzetto
G
G
Petit
L
L
Mann
H
H
Defaye
P
P
Contard
M
M
Polidori
C
C
D000328:Adult; D002302:Cardiac Output; D005260:Female; D006801:Humans; D008297:Male; D008722:Methods; D008943:Mitral Valve / Q000502:physiology*; D011446:Prospective Studies; D012039:Regional Blood Flow; D015203:Reproducibility of Results
Mesure du débit mitral à l'extrémité des valves. Validation d'une méthode simplifiée à partir de 101 cas.