[Etiology of left bundle branch block in Porto Alegre]
N R Koehler1, L C Bodanese, L Acevedo
1Hospital São Lucas e Faculdade de Medicina da PUC/RS, Porto Alegre.
Insights
The common causes of left bundle branch block (LBBB) in Porto Alegre align with global findings. Left axis deviation did not prove to be a reliable indicator for identifying specific cardiac disease etiologies in LBBB patients.
Area of Science:
- Cardiology
- Electrophysiology
Purpose:
To determine the type of cardiac disease causing left bundle branch block (LBBB) in Porto Alegre, Brazil, and to assess the role of associated left axis deviation (-30 degrees or more in the frontal plane) in order to identify a specific etiology of LBBB.
Methods:
Through reports from the assistant physicians or through examination of the patients, the underlying heart disease in 264 cases of LBBB was assessed. The chi-square test was used to determine a possible association between left anterior hemiblock LBBB and one or more specific type of underlying heart disease.
Results:
Systemic arterial hypertension (30.7%), ischemic heart disease (30.3%), valvar heart disease (8.7%), cardiomyopathies (7.5%), idiopathic degenerative disease of the conduction system (1.6%) and miscellaneous heart diseases (1.2%) were the underlying heart diseases. The presence of LBBB did not indicate any specific type of cardiac disease.
Conclusion:
The causes of LBBB in Porto Alegre are the same as reported in the international medical literature. Upward and leftward deviation (> or = -30 degrees) of QRS axis in the frontal plane did not show statistical significant association with any type of underlying cardiac disease.
More Related Videos
12:45Benefits of Cardiac Resynchronization Therapy in an Asynchronous Heart Failure Model Induced by Left Bundle Branch Ablation and Rapid Pacing
Published on: December 11, 2017
08:34Left Atrial Stenosis Induced Pulmonary Venous Arterialization and Group 2 Pulmonary Hypertension in Rat
Published on: November 18, 2018
Related Concept Videos
Pulmonary Hypertension: Classification and Pathogenesis
There are various classifications for PH, each relating to different underlying causes and also...
Mitral Regurgitation I: Introduction
Mitral Stenosis I: Introduction
Aortic Regurgitation I: Introduction
Coronary Artery Disease II: Pathophysiology
Dysrhythmias IV: Characteristics of Bradyarrhythmias
