High atrioventricular block is a pathological state between second degree atrioventricular block and third degree atrioventricular block, in which the atrioventricular conduction ratio is usually greater than 2:1, and more often than 4:1. This means that the greater the ratio, the more severe the condition.
Patients with high atrioventricular block already have obvious clinical symptoms, such as palpitations, dizziness, shortness of breath, weakness and chest tightness, and in severe cases, symptoms such as unresponsiveness, confusion, syncope and shock. The presence of a high degree of AV block is a sign that the disease has started to progress to third degree AV block and requires prompt intervention with drugs such as atropine, isoprenaline and, if necessary, artificial pacemaker implantation.