Atrioventricular (AV) block usually occurs progressively in myocardial infarction patients, moving from the 1st-degree or initial 2nd-degree block. The majority of patients have supranodal or intranodal block levels, and the ejection rhythms are often steady, with thin QRSs and heart rates higher than 40 beats per minute. Atropine typically has an effect on people with MI who have complete heart block (CHB). Most individuals get better in a few days and don't require a short-term or permanent stimulator. The study's goal was to ascertain how frequently patients with acute ST-elevation myocardial infarction experience full heart block. The cross-sectional research study was carried out at the Department of Cardiology, National Institute of Cardiovascular Diseases, Karachi, Pakistan. From September 22, 2021, to March 21, 2022, the study was conducted for six months following the approval of the summary. The study comprised every patient who contacted NICVD, Karachi and met the inclusion criteria. Following an explanation of the process, hazards, and advantages of the research, informed consent was obtained. ECGs, or serial cardiac electrocardiograms were taken to monitor the progression of total heart blockage. At admission, standard 12-lead surface electrocardiograms (ECGs) were performed with total heart block at a potential of 10 mm/mV and an average paper pace of 25 mm/s. The patients' ages varied from 18 to 75 years old, with a median age of 70 and an interquartile range of 14. 166 (62.6%) of the 265 patients were men, and 99 (37.3%) were women. In 14 (5.3%) of the patients, a complete heart block was discovered. It might be said that the study's results show a low percentage of full heart block. It is more common as one ages and is more common in the male gender.

KEY WORDS: Acute Coronary Syndrome; CABG (Coronary artery bypass grafting); CHB (Complete heart block); PCI (Percutaneous coronary intervention); and STEMI (ST-elevation myocardial infarction)