Atrioventricular block is a cardiac dysfunction manifested primarily by delayed atrial impulses, also known as atrioventricular block. The disease can be classified as first degree, second degree or third degree, with three different degrees of severity. The clinical symptoms, pathogenesis, electrocardiographic manifestations and risks vary between the different degrees.
In general, first degree AV block has few clinical symptoms and requires no special management. If there is a clear cause, aggressive intervention to address the cause is sufficient. Second degree AV block is characterised by palpitations, dizziness, weakness and a drop in blood pressure, with a trend towards high or third degree AV block.
Third-degree AV block is more serious, with clinical symptoms such as fatigue, dyspnea, chest pain, shortness of breath, unresponsiveness, confusion, syncope and shock, and can even cause sudden cardiac death, requiring timely intervention with medication and surgery.