An unusual cause of variable paced QRS complexes in a child with heart failure

Affiliations

• ¹ Division of Pediatric Cardiology, Department of Pediatrics, Norton Children's Hospital, University of Louisville School of Medicine, Louisville, KY, USA.
• ² Division of Pediatric Cardiology, Department of Pediatrics, Norton Children's Hospital, University of Louisville School of Medicine, Louisville, KY, USA. Electronic address: soham.dasgupta@louisville.edu.