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Right bundle-branch block in coronary artery disease: a hemodynamic and angiographic study
R P Dabizzi1, L Aiazzi, G A Barletta
1Department of Medicine, University of Florence, Italy.
Insights
Right bundle-branch block (RBBB) in coronary artery disease (CAD) patients is linked to more severe left ventricular damage, particularly wall asynergy and inferior wall issues, despite similar CAD severity. This suggests RBBB indicates worse outcomes in CAD.
Area of Science:
- Cardiology
- Electrophysiology
- Cardiovascular Imaging
Background:
- Right bundle-branch block (RBBB) is a common conduction abnormality.
- Its association with the severity of coronary artery disease (CAD) and left ventricular (LV) dysfunction requires further investigation.
Purpose of the Study:
- To determine if RBBB in CAD patients correlates with more extensive myocardial damage and more severe CAD.
- To compare LV function and coronary artery involvement between CAD patients with and without RBBB.
Main Methods:
- Retrospective study comparing 34 CAD patients with RBBB to 52 CAD patients without conduction disturbances.
- Assessment included clinical data, echocardiography (LV volumes, ejection fraction, wall asynergy), and coronary arteriography (Gensini's score).
Main Results:
- RBBB patients exhibited higher end-diastolic LV pressure and more severe, diffuse LV wall asynergy.
- CAD patients with RBBB and inferior wall myocardial infarction (MI) showed more severe posterobasal asynergy.
- CAD patients with RBBB and anterior wall MI had higher LV end-diastolic pressure, lower ejection fraction, and greater myocardial damage extent.
Conclusions:
- RBBB in CAD patients, especially those without prior MI, is associated with more significant LV myocardial damage and dysfunction.
- RBBB may serve as an indicator of more severe LV impairment in the context of CAD.
Abstract:
Thirty-four patients with right bundle-branch block (RBBB) and coronary artery disease (CAD) (RBBB was not pre-existent to clinical development of CAD) and 52 consecutive CAD patients without conduction disturbances were studied and compared to verify whether the presence of RBBB implies more severe and extensive left ventricular myocardial damage as well as more severe CAD. The two groups did not differ either in age or in New York Heart Association functional class. The incidence or location of previous myocardial infarction (MI) was not different in the two groups. No significant differences were found in left ventricular volumes or ejection fraction. Higher end-diastolic left ventricular pressure and more severe and diffuse left ventricular wall asynergy were present in RBBB patients. At coronary arteriography, more severe involvement of the right coronary artery in CAD patients without conduction disturbances was the only significant finding. The group of patients with CAD and RBBB without MI showed significantly less involvement of the left anterior descending coronary artery and significantly more severe damage of the inferior wall of the left ventricle than the group with CAD without RBBB and MI. Patients with inferior wall MI and RBBB had more severe asynergy of the posterobasal region of the left ventricle than did patients with inferior wall MI without RBBB. The group of patients with anterior wall MI and RBBB had a higher left ventricular end-diastolic pressure, a lower left ventricular ejection fraction, and a greater extent of myocardial damage compared to similar patients of the control group. The groups with MI and RBBB had the same Gensini's score as similar groups without RBBB. (ABSTRACT TRUNCATED AT 250 WORDS)