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Left bundle branch block (LBBB) is a cardiac conduction abnormality seen on the electrocardiogram (ECG). In this condition, activation of the left ventricle is delayed, which causes the left ventricle to contract later than the right ventricle.
Right bundle branch block (RBBB) is a distinctive pattern seen on the electrocardiogram (ECG) that occurs when the cardiac electrical impulse is interrupted as it spreads across the ventricles of the heart. 1  Read about the heartâs electrical system. 2  Read about the heartâs chambers and valves.