Frequency of Left Bundle Branch Block in Patients with Acute Myocardial Infarction; A Cross-Sectional Study
Reyhaneh Niknam1, Mahmonir Mohammadi2
1School of Medicine, Tehran Medical Sciences Branch, Islamic Azad University, Tehran, Iran.
Insights
Eight percent of myocardial infarction patients develop left bundle branch block (LBBB). This condition is linked to hypertension and a history of ischemic heart disease.
Area of Science:
- Cardiology
- Electrocardiography
- Public Health
Background:
- Cardiovascular diseases (CVDs) pose significant global health challenges.
- Non-invasive diagnostic methods for CVD, particularly myocardial infarction (MI), are of great interest.
- Left bundle branch block (LBBB) prevalence is noted to be higher in MI patients.
Purpose of the Study:
- To determine the frequency of LBBB in patients diagnosed with MI.
- To identify factors contributing to the development of LBBB in MI patients.
Main Methods:
- A cross-sectional study involving 150 MI patients (ST-elevation or non-ST-elevation MI).
- Patients were recruited from Boo-Ali and Amir-Al-Momenin hospitals in Tehran between January 2016 and June 2017.
- Data collected included the frequency of LBBB, right bundle branch block (RBBB), and associated contributing factors.
Main Results:
- Out of 150 patients (mean age 60.35±12.88 years), 12 (8%) presented with LBBB.
- Right bundle branch block (RBBB) was observed in 5 (3.3%) patients; 133 (89.7%) had neither LBBB nor RBBB.
- Significant contributing factors identified were family history, hypertension, and prior ischemic heart disease (P<0.05).
Conclusions:
- Approximately 8% of myocardial infarction patients develop left bundle branch block (LBBB).
- Hypertension and a personal or family history of ischemic heart disease are associated with LBBB in MI patients.
Background:
Cardiovascular disease (CVDs) is important problems in both developing and developed countries. Currently, non-invasive methods for diagnosis of CVD, especially myocardial infarction (MI), is an interesting subject in the cardiology field. Some evidence showed left bundle branch block (LBBB) is more prevalent among patients with MI. Hence, this study aimed to investigate the frequency of LBBB and their contributing factors in patients with MI.
Materials And Methods:
In this cross-sectional study, 150 patients with ST elevation or non-ST elevation on their admission electrocardiography who referred to Boo-Ali and Amir-Al-Momenin hospitals, Tehran from January 2016 to June 2017 entered the study. Frequency of LBBB and right bundle branch block (RBBB) in participants and the contributing factors were determined.
Results:
In this study, of 150 cases (mean age: 60.35±12.88 years), 109 (72.7%) were male, and 41 (27.3%) were female. Out of 150 cases, 12 (8%) had LBBB, 5 (3.3%) RBBB, and 133 (89.7%) had not RBBB or LBBB. Contributing factors were family history, hypertension, and history of ischemic heart disease (P<0.05).
Conclusion:
Eight percent of patients with myocardial infarction would develop LBBB, which is related to hypertension, and self and family history of ischemic heart disease.
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