Causes of third degree atrioventricular block

Third degree atrioventricular block is a relatively common heart disease, which can also be called complete atrioventricular block. Most patients are middle-aged and elderly people over 50 years old, and according to relevant statistics, the number of male patients is significantly higher than that of female patients. So, what is the cause of third degree atrioventricular block? Let me explain it to you below, I hope everyone can pay attention.

Third degree atrioventricular block refers to complete atrioventricular dissociation caused by the inability of all impulses from the atria to be transmitted due to an abnormally reduced conduction ability of a certain part of the atrioventricular conduction system. It is common in patients with coronary heart disease, especially those over 50 years old. The incidence of complete atrioventricular block in acute myocardial infarction is 1.8% to 8%, and the Fuwai Hospital reported it to be 2.6%. The incidence of acute inferior wall myocardial infarction is 2 to 4 times higher than that of anterior wall myocardial infarction. It usually occurs 1 to 4 days after onset and can last from a few seconds to several days. If third-degree atrioventricular block occurs in the inferior wall, first-degree or second-degree type I atrioventricular block may occur before or when complete atrioventricular block is eliminated. If third-degree atrioventricular block occurs in the anterior wall, second-degree type II atrioventricular block or right bundle branch block may occur before or after the infarction. A few cases may present with complete atrioventricular block from the beginning of the infarction.

Third degree atrioventricular block is a serious and dangerous arrhythmia that must be treated promptly and aggressively. On the one hand, we actively look for the cause and treat it accordingly, such as timely controlling various infectious diseases, correcting electrolyte disorders, treating primary diseases such as digitalis poisoning, myocarditis, and cardiomyopathy; on the other hand, we treat atrioventricular conduction block.

The symptoms and hemodynamic changes of third-degree atrioventricular block depend on the degree of ventricular rate slowing and the myocardial lesions and functional status. During physical activity, you may experience palpitations, dizziness, fatigue, chest tightness, and shortness of breath. If the ventricular rate is too slow, especially when the heart has obvious ischemia or other lesions, or is complicated by extensive acute myocardial infarction or severe acute myocarditis, the symptoms may be severe, including heart failure or shock, or slow reaction or confusion due to insufficient blood supply to the brain, and then develop into syncope (the incidence rate can reach 60%) or Adams-Stokes syndrome.

In fact, third degree atrioventricular block is not terrible as long as we have a positive attitude to face it. Today's medical technology is very advanced. This disease can be completely controlled as long as it is treated correctly. In addition, I would like to remind all patients and friends to undergo regular treatment. I wish you all a speedy recovery.