bundle branch block right AE SS HPO: HP_0011712 right bundle branch block SIDER: C0085615 10006582 RBBB WEB: http://medical-dictionary.thefreedictionary.com/right+bundle+branch+block A conduction system disorder AE that is a condition in which the electrical impulse from the bundle of His to the ventricles is delayed or fails to conduct along the right bundle branch, resulting in right ventricular depolarization by cell-to-cell conduction spreading from the interventricular septum and left ventricle to the right ventricle–ie, slow and uncoordinated Natural history Surgically induced RBBB has few acute hemodynamic consequences and a generally benign course long term; rarely, progression to complete heart block and sudden death occur, especially if accompanied by major His-Purkinje system–eg, left anterior hemiblock, first-degree AV block–injury; tetralogy of Fallot repair with an RBBB and a markedly prolonged QRS duration >180 ms have an ↑ risk for ventricular arrhythmias and sudden death. conduction system disorder AE