房室传导阻滞是心脏传导系统中最常见的一种传导阻滞,其本质是不应期异常地延长。在房室传导阻滞中,尤以第Ⅰ、Ⅱ度房室传导阻滞更为常见。其病因多为感染(尤其是风湿和白喉)、药物中毒(最常见的是洋地黄)、冠心病及迷走神经张力增高等。我们曾遇到4例具有暂时性体位性特征的第Ⅰ、Ⅱ度房室传导阻滞患者,其表现为平卧时由于迷走神经张力增高,使P-R间期延长,而于立位时交感神经张力较高,则使P-R间期缩短。这种表现与冠心病所致房室传导阻滞不同。鉴于此病目前尚缺乏报导,故摘其2例,报导如下:诊断标准:本文所提到的4例暂时性体位性房室传导阻滞诊断指标是:1.房室传导阻滞为暂时性。24小时内不经特殊治疗,其房室传导可由阻滞变为正常, Atrioventricular block is the most common type of conduction block in the heart conduction system. Its essence is that the refractory period is abnormally prolonged. In atrioventricular block, especially in Ⅰ, Ⅱ degree atrioventricular block is more common. Its causes are mostly infections (especially rheumatism and diphtheria), drug poisoning (the most common is digitalis), coronary heart disease and increased vagal tone and so on. We have encountered in 4 cases of temporary positional characteristics of Ⅰ, Ⅱ degree atrioventricular block patients, the performance of the supine vagus nerve tension increases, so that PR interval prolongation, and in the position of sympathetic tone Higher, then shorten the PR interval. This performance and coronary heart disease caused by atrioventricular block different. In view of the current lack of coverage of the disease, so the pick of its 2 cases, reported as follows: Diagnostic criteria: The four cases mentioned in this article diagnostic indicators of temporary position atrioventricular block: 1. Atrioventricular block is temporary . Within 24 hours without special treatment, the atrioventricular conduction can be changed from block to normal,