ECG of the Week 44

Sinus rhythm with 2:1 AV block in setting of acute inferior infarct.  The level of the block is most likely AV node rather than infranodal given the QRS of .12 and that the AV node and the inferior area are both supplied by the RCA.  In my experience, AV dysrhythmias are not uncommon in this setting so be prepared and look for them with IMI.