AN EVALUATION OF HEMODYNAMIC CHANGES IN CONVERSION OF ATRIAL FIBRILLATION USING LEFT VENTRICULAR SYSTOLIC TIME INTERVALS DERIVED FROM POLYGRAPHIC TRACINGS
The hemodynamic alterations before and after transient atrial fibrillation was observed 20 times in 18 cases by means of the noninvasively derived left ventricular systolic time intervals. The findings of the present study are briefy summarized as follows. 1) After conversion to normal sinus rhythm both the total systole (Q-II) and the ejection time (ET) were prolonged, the pre-ejection period (Q-U) did not change significantly, and the ET/Q-U ratio was increased. 2) In the follow-up observations after the conversion, the ET as well as the Q-II was gradually increased. In contrast, the Q-U was decreased, so that the ET/Q-U was also increased. These changes postulate that the left ventricular function is normalized because of improvement of the booster action of the atrium due to conversion to normal sinus rhythm, supporting the results by the invasive method found in the literature.