<Tr> <Th> eMedicine </Th> <Td> ped / 2500 </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> A right bundle branch block (RBBB) is a heart block in the electrical conduction system . </P> <P> During a right bundle branch block, the right ventricle is not directly activated by impulses travelling through the right bundle branch . The left ventricle however, is still normally activated by the left bundle branch . These impulses are then able to travel through the myocardium of the left ventricle to the right ventricle and depolarize the right ventricle this way . As conduction through the myocardium is slower than conduction through the Bundle of His - Purkinje fibres, the QRS complex is seen to be widened . The QRS complex often shows an extra deflection which reflects the rapid depolarisation of the left ventricle followed by the slower depolarisation of the right ventricle . </P>

What is a right bundle branch block in the heart