Analyzing a bundle branch block ecg strip is a fundamental skill for any clinician interpreting cardiac rhythms, as this pattern reveals a delay or block within the right or left bundle branch of the heart’s conduction system. The classic pattern includes a broad, slurred S wave in leads I and V6, often accompanied by a tall, wide R wave, while lead V1 typically shows a deep S wave with a secondary R wave, creating an rsR' pattern commonly referred to as "bunny ears.
Bundle Branch Block ECG Strip Step By Step Analysis
Conditions such as hypertension, aortic valve disease, myocardial infarction, cardiomyopathy, and pulmonary embolus can all precipitate this conduction abnormality. Identifying Right Bundle Branch Block on the ECG To identify a right bundle branch block, the ECG reader looks for specific criteria in the QRS morphology.
S wave duration in leads I and V6 exceeding 40 milliseconds. Secondary ST-segment and T-wave changes that oppose the main QRS deflection, often referred to as discordant repolarization.
Bundle Branch Block ECG Strip Step By Step Analysis
The left bundle branch further divides into the anterosuperior and posteroinferior fascicles, ensuring the left ventricle contracts almost simultaneously from endocardium to epicardium. Absence of q waves in leads I, V5, and V6.
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