Second-degree second-degree AV block is the most common type of second-degree AV block in clinical practice, and the life expectancy of patients with this type of block varies from person to person. Second-degree second-degree AV block is a condition in which the signal between the atria and ventricles cannot be transmitted and there is a ventricular leak, which appears on the ECG as a partial P wave followed by no QRS wave group. If the patient does not have symptoms such as chest tightness, dizziness, or syncope, he or she can take medications under the guidance of a cardiologist, and life expectancy is usually not affected. If the patient shows a lack of blood supply to the heart and brain, such as blackout, if there are no other diseases, the patient’s life expectancy is usually the same as normal if a pacemaker is placed in time. In addition, the prognosis for patients with second degree type II AV block is usually good and there is no need to worry too much.