INFANT EKG

Name 5 ways a normal infant's EKG differs from that of a normal adult.

ANSWERS:
rightward axis
tall R in V1-2
shorter QRS interval
shorter PR interval
relatively faster HR
inverted T waves in leads V1-3These differences arise because of an infant's proportionately larger right ventricle yet still smaller total cardiac muscle mass relative to an adult's heart.

SourceSharieff, G MD and Rao, S. "The Pediatric ECG." Emerg Med Clin N Am, 2006.