<Tr> <Th> eMedicine </Th> <Td> ped / 2501 </Td> </Tr> <Tr> <Td_colspan="2"> (edit on Wikidata) </Td> </Tr> <P> Left bundle branch block (LBBB) is a cardiac conduction abnormality seen on the electrocardiogram (ECG). In this condition, activation of the left ventricle of the heart is delayed, which causes the left ventricle to contract later than the right ventricle . </P> <P> Among the causes of LBBB are: </P>

What is a left bundle branch block in the heart