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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.
Bundle Branch Block. Related terms: bbb, left bundle branch block (LBBB), right bundle branch block (RBBB), arrhythmia. Your heart has a natural pacemaker called the sinoatrial (SA) node which sends an electrical impulse throughout your heart to cause it to beat (contract).