obsolete left bundle branch block https://github.com/monarch-initiative/mondo/issues/2536 https://www.malacards.org/card/left_bundle_branch_hemiblock true OBSOLETE. A bundle branch block in which the activation of the left ventricle is delayed. MONDO:0000991 SCTID:4973001 SCTID:63467002 DOID:10272 ICD9:426.2 to be replaced with external ontology term