title: Transvenous pacing, alternate bilateral bundle-branch block, and syncope.
mesh_terms: D002037:Bundle-Branch Block / Q000209:etiology*; D006328:Cardiac Catheterization / Q000009:adverse effects*; D006801:Humans; D007049:Iatrogenic Disease; D008297:Male; D008875:Middle Aged; D010138:Pacemaker, Artificial / Q000009:adverse effects*; D013575:Syncope / Q000209:etiology*