老年人室性早搏对心功能的影响

The effect of ventricular extrasystole on the cardiac function of the aged patients

为探讨老年人的早搏收缩对心功能的影响,对45例年龄大于或等于60岁的室性早搏病人用无创心阻抗微分图检查,并以45例年龄小于60岁的室性早搏病人作为对照.老年组早搏前、后的每搏排血量均非常显著低于对照阻(61±25ml对83±20ml,P<0.01和82±33ml对107±26ml,P<0.01),早搏后强化作用使心排血量净增值和增加的百分率两组相似(21±12±ml对24±16ml,P>0.05和34%对30%,P>0.05).期前收缩时,射血前期延长,左室射血时间缩短,使两者的比值明显增高.早搏后强化作用使对照组的左心室射血时间基本不变,而老年组的则有所延长.早搏明显减少老年人心排血量,相对减少量与非老年人相似.早搏后强化作用对老年人同样有代偿效应..

In order to explore the effect of ventricular extrasystole on the cardiac function of the elderly people, the non-injury test of cardiac impedence first derivative gram has been applied for 45 patients aged 60 or more suffering from ventricular extrasystole in contrast with a control comprising 45 patients aged less than 60 who had premature beats too. The clinical observaiton has shown that while the net increase both in absolute value and percentage in cardiac output caused by pos-textrasystolic potentiation were similar (21 ±12ml vs 24 ±16ml, P>0. 05 and 34% vs 30%, P> 0. 05) for the two groups, the stroke volume prior to the premature contraction of the former group was significantly less than the latter (61 ±25ml vs 83 ±201. F<0. 01 and 82 ±33ml vs 107 ±26ml,P<0. 01). It has been found that when ventricular extrasystole took place, the time prior to the ejection was prolonged and ejection time of the left ventricular of the controled group basically unchanged but lengthened that of the elderly group. In all, the present clinical study has provided certain evidence that ventricular extrasystole apparently tends to decrease the cardiac output of elderly people, but in comparison with those non-aged, their relative decrement seems to be similar. In addition, the postextrasystolic potentiation also possesses compensation effect for old people as well.