Absence of q waves in leads I, V5, and V6. Recognizing the new onset of a bundle branch block should prompt a careful search for reversible or progressive cardiovascular disease.
Understanding Bundle Branch Block ECG Strip Causes and Examples
On the ECG strip, the QRS complex in lateral leads (I, aVL, V5, V6) will show a broad monophasic R wave without a q wave, while leads V1 and V2 typically display a wide, deep S wave. Key Diagnostic Criteria for Right Bundle Branch Block QRS duration greater than or equal to 120 milliseconds.
Criteria Essential for Left Bundle Branch Block Diagnosis QRS duration exceeding 120 milliseconds. 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 Causes Examples
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. Because the left ventricle is activated later, the initial septal depolarization is reversed, eliminating the normal septal q waves and producing a characteristic QS or rS pattern in the right-sided leads.
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