Is first-degree atrioventricular block serious?
Apr 16, 2023
Source: Cainiu Health
Dr. Tian Hongbo
Introduction
First-degree atrioventricular block usually refers to first-degree atrioventricular conduction block, which is generally not serious. It indicates a slowing of electrical impulse conduction from the atria to the ventricles, although every atrial impulse still conducts to the ventricles. It may be caused by factors such as emotional stress, medication use, or conditions like rheumatic myocarditis, leading to increased vagal tone. Typically, no obvious symptoms occur, so it is generally considered benign.
First-degree atrioventricular block usually refers to first-degree atrioventricular conduction block, which is generally not serious.
In clinical practice, first-degree atrioventricular conduction block typically means delayed electrical conduction from the atria to the ventricles. However, every atrial impulse can still be conducted to the ventricles. On electrocardiogram (ECG) examination, this may manifest as a PR interval prolonged beyond 0.20 seconds, with a QRS complex following each P wave. It may result from factors such as excessive anxiety or emotional excitement, long-term use of medications like digoxin or quinidine, or underlying conditions including rheumatic myocarditis and ischemic heart disease, all of which can lead to increased vagal tone. Generally, it does not cause significant clinical symptoms in patients, so it is usually considered benign and requires only regular follow-up observation.
If, in daily life, the underlying disease is actively treated, emotions are properly managed, diet is well-regulated, rest and activity are balanced, and appropriate physical exercise is performed, the occurrence of first-degree conduction block can often be prevented.
