DIASTOLIC MITRAL REGURGITATION DETECTED BY PULSED WAVE DOPPLER ECHOCARDIOGRAPHY AND COLOR FLOW DOPPLER MAPPING IN FIVE DOGS AND TWO CATS WITH SECOND- AND THIRD-DEGREE ATRIOVENTRICULAR BLOCK

Authors

  • Steven L. Rosenthal DVM,

    1. Department of Medicine of the Animal Medical Center, 510 East 62nd Street, New York, New York 10021.
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  • Philip R. Fox DVM, MS

    Corresponding author
    1. Department of Medicine of the Animal Medical Center, 510 East 62nd Street, New York, New York 10021.
      Address correspondence and reprint requests to Dr. Philip R. Fox, The Animal Medical Center, 510 East 62nd Street, New York, New York 10021.
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Address correspondence and reprint requests to Dr. Philip R. Fox, The Animal Medical Center, 510 East 62nd Street, New York, New York 10021.

Abstract

M-mode echocardiography, color flow Doppler mapping, and pulsed wave Doppler echocardiography were used to characterize diastolic mitral regurgitation in five dogs and two cats with second- and third-degree atrioventricular block. Incomplete closure and partial reopening of the mitral valve following nonconducted P-waves were demonstrated by m-mode echocardiography. Low velocity reflux of blood into the left atrium after nonconducted P-waves was imaged by color-flow Doppler mapping and spectral Doppler echocardiography. Late diastolic mitral regurgitation was not observed in clinically normal control dogs or cats, but a low velocity, mid-diastolic flow reversal was detected in the dogs. This probably represented normal physiologic intravalvular flow. Diastolic mitral regurgitation is a common echocardiographic finding, in dogs and cats with, second- and third-degree atrioventricular block.

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