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
- Beta-agonists: adrenaline, isoprenaline, salbutamol, dobutamine
- Sympathomimetics: amphetamines, cocaine, methylphenidate
- Antimuscarinics: antihistamines, TCAs, carbamazepine, atropine
- Others: caffeine, theophylline, marijuana
- Heart rate 150 bpm.
- P waves are hidden within each preceding T wave.
With very fast heart rates the P waves may be hidden in the preceding T wave, producing a ‘camel hump’ appearance.
LITFL Further Reading
- ECG Library Basics – Waves, Intervals, Segments and Clinical Interpretation
- ECG A to Z by diagnosis – ECG interpretation in clinical context
- ECG Exigency and Cardiovascular Curveball – ECG Clinical Cases
- 100 ECG Quiz – Self-assessment tool for examination practice
- ECG Reference SITES and BOOKS – the best of the rest
- Brady WJ, Truwit JD. Critical Decisions in Emergency and Acute Care Electrocardiography
- Surawicz B, Knilans T. Chou’s Electrocardiography in Clinical Practice: Adult and Pediatric
- Wagner GS. Marriott’s Practical Electrocardiography 12e
- Chan TC. ECG in Emergency Medicine and Acute Care
- Rawshani A. Clinical ECG Interpretation
- Mattu A. ECG’s for the Emergency Physician
- Hampton JR. The ECG In Practice, 6e