Differential Diagnoses: poor R wave progression, prolonged QT intervals, and much more

ECG Weekly Workout with Dr. Amal Mattu


A 53-year-old woman presents to the emergency department with shortness of breath. The following ECG is obtained:

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

1. What ECG abnormalities do you notice?
2. What is your differential diagnosis for causes of prolonged QT intervals?
3. Which electrolyte abnormality is most likely to cause the ECG abnormality seen?