Analyze whether RBBB is associated with in-hospital death
Abstract
Background: Left bundle branch block and right bundle branch block (RBBB) have been implicated with raised in-hospital and long-term mortality in patients with acute ST elevation myocardial infarction (STEMI).
Aim of the study: The purpose of this study is to determine whether RBBB is connected with in-hospital death.
Methods: This study was a prospective observational study conducted in Department of Cardiology, National Institute of Cardiovascular Diseases, Dhaka, Bangladesh, from August 2015 to September 2016. The study included 108 patients with RBBB (Group I) and 108 patients without RBBB (Group II). All data was collected, documented in a Microsoft Excel work sheet, and analyzed using descriptive statistics in SPSS 17.0.
Results: The average age was 54.31±12.51 years in Group I and 51.34±10.80 years in Group II. A statistically significant difference in LV ejection fraction was identified among the study subjects (p=0.001). The new, old, and age undetermined RBBB was 33.33%, 25.9%, and 40.74%, respectively. Bi-fascicular block and isolated were 40.7% and 59.3%, respectively. 37.0% were transient, while 63.0% were permanent. In all, 27.8% of patients in Group I suffered heart failure in Killip class II, compared to 13% in Group II, with a statistically significant difference (p =0.007). The mortality rate for new, old, and age undetermined RBBBs was 18.9%, 14.3%, and 25.6%, respectively.
Conclusion: Acute STEMI patients with RBBB had a greater in-hospital mortality rate than those without it. Acute STEMI patients with RBBB are more likely to develop complications such as heart failure, cardiogenic shock, ventricular tachycardia, total heart block, and the need for a temporary pacemaker.
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References
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