Second-degree type II sinus block can progress to third-degree sinus block as the condition progresses and can become more severe.
Second-degree type 2 sinus block is one of the more serious arrhythmias and is often seen on diagnostic electrocardiograms. Patients with second-degree type 2 AV block often experience fatigue, seizures, dizziness, and fainting. First or second-degree block is an incomplete block and third-degree block is a complete block.
Second-degree type 2 AV block is one of the more dangerous types of AV block and often develops into complete AV block within a short period of time if not treated properly.
Second-degree type 2 sinoatrial block also carries a risk of sudden death, and in severe cases, sudden cardiac arrest can occur. Therefore, it should be treated early and regularly to avoid adverse consequences.