Heart problem is a problem in the electrical signals in the heart. Electrical signals initiate a regular heartbeat that comes from the heart pacemaker, the sinoatrial node (SA), which is located at the top of the right atrium. Although the AV block is relative, the third-degree AV block is respectively rare. The incidence in the general population appears to be low, approximately 0.02% to 0.04 %. A 65-year-old male patient admitted in the hospital with chief complaints of giddiness with sweating and history of symptomatic AV-block with no chest pain, shortness of breath. Patient underwent surgery of Inserted temporary pacemaker, permanent pacemaker and D-Data direction register (DDDr). In clinical use, the adverse effects of QT-prolonging drugs can be checked by not exceeding the prescribed dose, withdrawing their use in patients with pre-existing cardiac disease, premature ventricular arrhythmias, and electrolyte imbalance such as hypokalemia. Simultaneous administration of drugs that inhibit the cytochrome P450. In emergency conditions, patients must keep in proper physicians and monitoring. This paper might help physician’s research scholars, nursing staff, and other healthcare departments.