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P-wave duration in a clinically normal hound population

S R Blumenthal1, M A Vonderhaar, L P Tilley

  • 1Carolinas Medical Center, North Carolina, USA.

Laboratory Animal Science
|April 1, 1996
PubMed
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The standard P-wave duration in dogs may be too short, potentially leading to overdiagnosis of cardiac issues. This study found longer P-wave durations in clinically normal hounds, suggesting an update to veterinary electrocardiogram (ECG) standards is needed.

Area of Science:

  • Veterinary Cardiology
  • Diagnostic Imaging

Background:

  • Electrocardiogram (ECG) analysis is vital for diagnosing cardiac conditions in veterinary medicine.
  • Accurate P-wave analysis is essential for identifying atrial changes.
  • The current maximal normal P-wave duration in dogs is accepted as <= 40 milliseconds.

Purpose of the Study:

  • To evaluate P-wave duration in a population of clinically normal hounds.
  • To compare measured P-wave durations against established normal values.
  • To determine if body weight or sex influences P-wave duration.

Main Methods:

  • ECG recordings were obtained from 364 clinically normal hounds (13-35 kg) during routine health screening.
  • Dogs were not anesthetized or sedated and were in a standard position.

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  • P-wave duration was measured from lead-II recordings.

    • Main Results:

    • The mean P-wave duration in the study population was 44.9 +/- 6.1 milliseconds, exceeding the accepted normal value.
    • A significant difference in mean P-wave duration was observed based on body weight (P < 0.001).
    • Significant differences were also found based on sex (P < 0.01), with females exhibiting longer mean P-wave durations.

    Conclusions:

    • Published normal P-wave duration values may be shorter than true normal values for clinically normal hounds.
    • Using current standards may lead to overdiagnosis of cardiac abnormalities and inaccurate study results.
    • The recommended maximal normal P-wave duration for dogs should be re-evaluated and potentially increased.