ISSN 2398-2950      

ECG: principles of interpretation

ffelis
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

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Heart rhythm

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Measure complexes and intervals

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Mean electrical axis (MEA)

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Conclusion

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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).

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