St.Vincent Hospital, 10590 North Meridian Street, Suite 200, Indianapolis, IN 46290, USA.
Cardiac Arrhythmia Service, St. Vincent Hospital, 8333 Naab Road, Indianapolis, IN 46260, USA; Duke University Medical Center, Durham, NC, USA.
Cardiol Clin. 2023 Aug;41(3):307-313. doi: 10.1016/j.ccl.2023.03.007.
Delayed atrioventricular (AV) conduction most commonly occurs in the AV node, resulting from AH prolongation on an intracardiac electrocardiogram and PR prolongation on a surface electrocardiogram. AV conduction may be blocked in a 2:1 manner, with a normal PR interval and wide QRS suggesting infranodal disease, whereas a prolonged PR interval and narrow QRS are more suggestive of AV nodal disease. Block within the His is suspected when there is 2:1 AV block with normal PR and QRS intervals. Complete heart block occurs when the atrial rhythm is totally independent of a junctional or lower escape rhythm.
房室（AV）传导延迟最常发生在房室结，表现为心内电图上 AH 间期延长和体表心电图上 PR 间期延长。AV 传导可能以 2:1 的方式受阻，正常 PR 间期和宽 QRS 提示结下疾病，而较长的 PR 间期和窄 QRS 更提示房室结疾病。当存在 2:1 的 AV 阻滞，PR 和 QRS 间期正常时，怀疑希氏束内阻滞。完全性心脏阻滞发生时，心房节律完全独立于结性或较低的逸搏节律。
