Sinus tachycardia

Sinus tachycardia Overview

Sinus rhythm with a resting heart rate of > 100 bpm in adults, or above the normal range for age in children.


Note: Normal heart rates in children
  • Newborn: 110 – 150 bpm
  • 2 years: 85 – 125 bpm
  • 4 years: 75 – 115 bpm
  • 6 years+: 60 – 100 bpm

Causes

Non-pharmacological

Pharmacological
  • Beta-agonists: adrenaline, isoprenaline, salbutamol, dobutamine
  • Sympathomimetics:  amphetamines, cocaine, methylphenidate
  • Antimuscarinics:  antihistamines, TCAs, carbamazepine, atropine
  • Others: caffeine, theophylline, marijuana

Example ECG

ECG Sinus Tachycardia

Sinus tachycardia:

  • Heart rate 150 bpm.
  • P waves are hidden within each preceding T wave.

Handy Tip

ECG Camel hump hidden p waves

With very fast heart rates the P waves may be hidden in the preceding T wave, producing a ‘camel hump’ appearance.


Related Topics


LITFL Further Reading


Advanced Reading


ECG LIBRARY 700

ECG LIBRARY

Electrocardiogram

Emergency Physician in Prehospital and Retrieval Medicine in Sydney, Australia. He has a passion for ECG interpretation and medical education | ECG Library |

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