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Postextrasystolic T wave changes in normal canine hearts.

M S Yoon, D P O'Connell, J Han

    Cardiovascular Research
    |November 1, 1984
    PubMed
    Summary
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    Postextrasystolic T wave changes in normal hearts were studied. These T wave alterations following premature ventricular beats lack diagnostic value in healthy hearts.

    Area of Science:

    • Cardiology
    • Electrophysiology

    Background:

    • Premature ventricular beats (PVBs) can influence subsequent cardiac electrical activity.
    • T wave changes following PVBs are not well-characterized in normal hearts.

    Purpose of the Study:

    • To investigate the occurrence and nature of T wave changes after induced PVBs in normal canine hearts.
    • To determine the diagnostic significance of postextrasystolic T wave alterations.

    Main Methods:

    • Induced PVBs at variable coupling intervals in 19 closed-chest dogs.
    • Observed T wave morphology and amplitude following different postextrasystolic cycle lengths.

    Main Results:

    • T wave polarity reversal occurred in 31% of dogs with longer postextrasystolic cycles.

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  • Amplitude changes were observed in 31% of dogs.
  • No significant T wave changes were noted in 38% of dogs.

    • Conclusions:

    • Postextrasystolic T wave changes are present in normal hearts.
    • These observed T wave changes do not hold diagnostic value.