Differential Diagnoses: narrow complex irregular tachycardia, short QTc intervals, ST segment elevation in aVR, and so much more!

UMEM Potpourri ECG Cases with Dr. Amal Mattu


An 89-year-old woman is brought into the emergency department with generalized weakness and dizziness. She is noted to be bradycardic at triage. The following ECG is obtained with no prior ECGs available for comparison:

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

  1. What is the rate and rhythm?
  2. What conduction abnormalities do you notice?
  3. Do you think this patient will need a pacemaker?