Jason's Blog: ECG Challenge of the Week, 6-8-12     INTERPRETATION:

1)  In first half of strip: Normal sinus rhythm (rate = 100/min) with . . .

2)  . . . bifascicular block—right bundle-branch block plus left anterior hemiblock 

      (RBBB + LAHB), left axis deviation (LAD) at -57 degrees.

3)   In second half of strip: Sinus rhythm interrupted by a run of nonconducted atrial bigeminy  (arrows (↓); see laddergram).

Jason E. Roediger, CCT, CRAT