case_images: PMC4322402_01
case_images: PMC4322402_02
case_images: Narrow complex tachycardia with left bundle branch block
case_images: APC-8-50-g001.jpg
case_images: PMC4322402_02_APC-8-50-g001.jpg
case_images: F1
case_images: An initial diagnosis of SVT with left bundle branch block was made [Figure 1].
case_images: Normal sinus rhythm following treatment.. ECMO: Extracorporeal membrane oxygenation, IV: Intravenous, PALS: Pediatric advanced life support, SVT: Supraventricular tachycardia
case_images: APC-8-50-g002.jpg
case_images: PMC4322402_02_APC-8-50-g002.jpg
case_images: F2
case_images: The presence of P waves suggested that it was likely due to a concealed accessory pathway [Figure 2].