Author + information
- Received July 22, 1991
- Revision received March 19, 1992
- Accepted March 27, 1992
- Published online August 1, 1992.
- Philippe Brun, MD∗,
- Christophe Tribouilloy, MD∗,
- Anne-Marie Duval, MD,
- Laurence Iserin, MD,
- Alberto Meguira, MS,
- Gabriel Pelle, PhD and
- Jean-Luc Dubois-Rande, MD
- ↵∗Address for correspondence: Philippe Brun, MD, Service d'Explorations Fonctionnelles, Hôpital Henri Mondor, F 94010 Créteil, France.
Objectives. This study was designed to evaluate the relation between the velocity of flow propagation and left ventricular relaxation by using color M-mode Doppler echocardiography to analyze flow propagation in the left ventricle.
Background. Noninvasive attempts to identify alterations in left ventricular relaxation have been hampered because both the relaxation rate and left atrial filling pressure are the determinants of peak early velocity and filling rate.
Methods. Color M-mode velocity data were transferred to a microcomputer and compared with conventional pulsed Doppler data to assess the ability of color M-mode echocardiography to analyze velocity field properties. The velocity of flow propagation was measured as the slope of the flow wave front during early filling in normal subjects (n = 29) and in patients with disease that alters relaxation (dilated cardiomyopathy [n = 31], ischemic cardiomyopathy [n = 8], hypertrophic cardiomyopathy [n = 5], systemic hypertension [n = 22] and aortic valve disease [n = 25]). In nine patients with end-stage dilated cardiomyopathy, echocardiographic and left heart catheterization data were obtained at baseline and during intracoronary dobutamine infusion.
Results. Color M-mode and pulsed Doppler echocardiographic data were highly correlated (n = 217, r = 0.94, p < 0.0001, velocity range 0.2 to 1.5 m/s). The velocity of flow propagation was lower in patients than in normal subjects (0.46 ± 0.15 vs. 0.84 ± 0.11 m/s, p < 0.0001). The decrease was significant in all disease forms with or without left ventricular dilation. The velocity of flow propagation was related to peak early velocity in normal subjects (p < 0.001) but not in patients. It varied inversely with the isovolumetric relaxation time constant during dobutamine infusion and the two variables were highly correlated (p < 0.0001).
Conclusions. The velocity of flow propagation during early filling seems to be highly dependent on the left ventricular relaxation rate and could be an important tool in studying diastolic function.
↵∗ Present address: Service de Cardiologie, Centre Hospitalo-Universitaire d'Amiens, Amiens, France.
☆ This study was supported in part by a research grant from the Société Française de Cardiologie, Filiale d'Echocardiographie, Paris, France.
- Received July 22, 1991.
- Revision received March 19, 1992.
- Accepted March 27, 1992.