近年来,有些病儿在呼吸道感染以后出现心律不齐,经心电图检查证实系房室传导阻滞。传导阻滞的程度在睡眠时加重,而在清醒时,尤其在啼器、作仰卧起坐运动后减轻或恢复正常(图1a、1b)。体位的改变也可迅速改变阻滞的程度,例如从仰卧位突然坐起时,传导阻滞可以从Ⅱ度立即转变为Ⅰ度或消失(图2)。显然,迷走神经的兴奋对阻 In recent years, some sick children appear arrhythmia after respiratory tract infection, confirmed by electrocardiogram is atrioventricular block. The degree of conduction block is aggravated during sleep, and is reduced or returned to normal after awake, especially in the cricket, after crunches (Figs. 1a, 1b). Changes in posture can also quickly change the degree of blockage, for example, when sitting abruptly from the supine position, the block can be immediately changed from degree II to degree I or disappear (Figure 2). Obviously, the excitement of the vagus nerve blocking