Felis ISSN 2398-2950

ECG: principles of interpretation

Contributor(s): Phil Fox, Simon Swift

Introduction

  • The interpretation should be based on a good ECG recording ECG: overview.
  • Four features should be examined on every ECG:
    • Heart rate.
    • Heart rhythm.
    • Complexes dimensions and intervals.
    • Mean electrical axis (MEA).
  • The largest positive (upward) deflections are usually the R waves. The Q are S waves are usually negative waves immediately preceding or following the R wave respectively. The T wave is the deflection following the S wave after a short pause.
  • The P wave precedes the Q wave and is usually positive.

Heart rate

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Heart rhythm

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Measure complexes and intervals

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Mean electrical axis (MEA)

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Conclusion

This article is available in full to registered subscribers

Sign up now to purchase a 30 day trial, or Login

Further Reading

Publications

Refereed papers

Other sources of information

  • Kittleson M D (1998) Electrocardiography - Basic Concepts, Diagnosis of Camber Enlargement and Intraventricular Conduction Disturbances. In: Small Animal Cardiovascular Medicine. Eds M D Kittleson & R D Kienle, Mosby.
  • Tilley L P (1992) Essentials of Canine and Feline Electrocardiography - Interpretation and Treatment. Lea & Febiger (The definitive text).


ADDED