Any bradycardia unresponsive to drug therapy and causing hemodynamic insufficiency is an indication for electrode placement. Pacemaker placement is warranted in acute myocardial infarction (MI) underthe following conditions because of the likelihood of progression to an advnced block: 20 block either Mobitz 2 , or Mobitz 1 when associated with nundlebranch block (BBB); 1 block with new unilateral BBB.