1. Sinus Rhythm

  1. David H. Bennett MD FRCP

Published Online: 1 NOV 2012

DOI: 10.1002/9781118432389.ch1

Bennett's Cardiac Arrhythmias: Practical Notes on Interpretation and Treatment, Eighth Edition

Bennett's Cardiac Arrhythmias: Practical Notes on Interpretation and Treatment, Eighth Edition

How to Cite

Bennett, D. H. (2013) Sinus Rhythm, in Bennett's Cardiac Arrhythmias: Practical Notes on Interpretation and Treatment, Eighth Edition, John Wiley & Sons, Ltd, Oxford. doi: 10.1002/9781118432389.ch1

Author Information

  1. Senior Consultant Cardiologist, University Hospital of South Manchester, Manchester, UK

Publication History

  1. Published Online: 1 NOV 2012
  2. Published Print: 14 JAN 2013

ISBN Information

Print ISBN: 9780470674932

Online ISBN: 9781118432389

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Keywords:

  • ECG characteristics;
  • Sinus arrhythmia;
  • Sinus bradycardia;
  • Sinus rhythm;
  • Sinus tachycardia

Summary

The sinus node lies at the junction of the superior vena cava and right atrium. Atrial activation travels inferiorly from the sinus node to the atrioventricular (AV) node, resulting in a positive P wave in the inferior ECG leads, II, III and aVF. If the QRS complex is preceded by a P wave that is not positive in the inferior leads then the rhythm is other than sinus rhythm. The sinus node impulse is conducted relatively slowly via the AV node to reach the His–Purkinje system, which then conducts very rapidly to activate the ventricular myocardium.

Normal sinus rhythm is characterised by a rate of 60–100 beats/min; PR interval 0.12–0.21 s; QRS duration ≤ 0.10 s; QTc ≤ 0.44 s.