Differential Diagnoses: the most likely causes of a prolonged QT interval

ECG Weekly Workout with Dr. Amal Mattu


A 70-year-old woman presents to the ED with upper abdominal pain and vague paresthesias. The following ECG is obtained:

Before watching this week’s video, ask yourself these questions:

  1. What ECG abnormalities do you notice?
  2. What is your differential for the patient’s prolonged QT-interval?
  3. Assuming the patient has a normal temperature, what is the most likely cause of the prolonged QT-interval?