Christmas Case: Decoding the ECG of a 7-year-old boy with lightheadedness and palpitations

ECG Weekly Workout with Dr. Amal Mattu


A 7-year-old boy visiting from London is brought into the emergency department for palpitations and lightheadedness. He has a history of prior long bone fractures, walks with crutches, and appears frail with short limbs and stature. Mental status is normal and he is noted to be very upbeat and happy. The following ECG is obtained:

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

  1. What interval abnormalities are present?
  2. What is the most likely diagnosis?