Rhythm Interpretation: Sutton’s rule for the best lead to evaluate atrial activity

ECG Weekly Workout with Dr. Amal Mattu


A patient presents to the emergency department with palpitations and is found to have an irregular rhythm. The following ECG is obtained:

Before watching the video, look closely at this ECG and ask yourself:

  1. What is the rhythm?
  2. What lead identifies atrial activity best when interpreting difficult rhythms?