Study of conduction blocks in acute myocardial infarction

Abstract

Context: Acute myocardial infarction (AMI) is a global epidemic. As a leading cause of morbidity and mortality, AMI is a major public health problem. Many of these deaths are attributed to the development of arrhythmias during the period of myocardial infarction (MI). Aims: To study various patterns of conduction blocks occurring in AMI and to determine the prognostic implications of conduction blocks in AMI. Settings and Design: Study was conducted at a Tertiary Care Teaching Hospital in Imphal. The study design was longitudinal study. Subjects and Methods: One hundred AMI patients from October 2013 to September 2015 were evaluated by detailed history, clinical examination, routine investigations, and observed for conduction defects. Statistical Analysis Used: Statistical Package for the Social Sciences (SPSS 16.0 version) and t-test, Chi-square test, and Fisher's exact were used for statistical analysis. P < 0.05 was considered statistically significant. Results: Atrioventricular (AV) blocks were more common in inferior wall MI and bundle branch blocks were more common in anterior wall MI (AWMI). AMI patients with conduction block had higher chance of mortality (41.2% vs. 16.8%) as compared to nonconduction block AMI patients. Conclusions: Most of the AMI patients were males. The most common block is being first-degree heart block. AV blocks were more common in inferior wall MI and bundle branch blocks were more in AWMI. Mortality was increased in MI patients with conduction block than that of nonconduction block.