2004 年 70 巻 697 号 p. 1254-1261
Computational fluid dynamics of intraventricular flow during diastole was carried out to investigate the relationship between a left ventricular (LV) diastolic function and a color M-mode Doppler (CMD) echocardiogram. Results showed that a vortex ring, which was generated around a ventricular filling flow, locally increased velocity of the inflow due to a vena contracta effect and whereby created a maximum velocity point (MVP) there. Growth of the vortex ring with a ventricular expansion shifted MVP towards the apex. Although this occurred regardless of goodness of LV diastolic function, growth of the vortex ring was decelerated or reduced with deterioration of LV diastolic function, which resulted in a decrease in traveling distance and speed of MVP. It was reflected to shortening of an aliasing area in CMD echocardiogram. In a physiological range, a good correlation was found between traveling distance and speed of MVP and LV diastolic function. These findings validated the utility of the CMD echocardiographic technique for assessing LV diastolic function.