What findings indicate sinus tachycardia in children?

Updated: Sep 15, 2020
  • Author: Catharine A Bon, MD; Chief Editor: Kirsten A Bechtel, MD  more...
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If the QRS is narrow, determine whether sinus tachycardia or supraventricular tachycardia is more probable. Evidence supporting sinus tachycardia includes the following:

  • Presence of P waves

  • Variable R-R intervals

  • Heart rate less than 180 bpm

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