- Sinus rhythm with a resting heart rate of > 100 bpm in adults, or above the normal range for age in children.
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
With very fast heart rates the P waves may be hidden in the preceding T wave, producing a ‘camel hump’ appearance.
- Heart rate 150 bpm.
- P waves are hidden within each preceding T wave.
- ECG BASICS – Waves, Intervals, Segments and Clinical Interpretation
- ECG CLINICAL CASES – Your favourite ECG’s placed in clinical context with a challenging Q&A approach
- ECG and Cardiology Eponymous Syndromes – Cheats guide to eponymous emancipation
- ECG Reference Sites on the WEB – the best of the rest
- Chan TC, Brady WJ, Harrigan RA, Ornato JP, Rosen P. ECG in Emergency Medicine and Acute Care. Elsevier Mosby 2005.
- Surawicz B, Knilans TK. Chou’s Electrocardiography in Clinical Practice. 6th Edition. Saunders Elsevier 2008.