The Repeatability and Left Atrial Strain Analysis Obtained via Speckle Tracking Echocardiography in healthy Dogs.

In left atrial (LA) strain-derived two-dimensional speckle tracking echocardiography, the reference intervals in healthy dogs can provide useful information to evaluate the LA function in dogs with heart disease. Six laboratory beagles and 120 privately owned dogs without cardiac diseases were recruited. The LA strain and strain rate (SR) and echocardiographic indices were obtained in dogs who underwent standard echocardiography and offline analysis for LA strain and SR measurement by speckle tracking echocardiography. The intra-observer within-day variations of strain variables showed adequate repeatability (coefficient of variation <20%). The mean values of strain were 25.37 for the LA reservoir function, 11.06 for the LA conduit function, and 14.17 for the LA booster-pump function; the strain was significantly correlated with the LA fractional volume change at each phasic function. The left atrial longitudinal strain during early ventricular diastole showed moderate correlation with the peak velocity of early diastolic transmitral flow (r = 0.5560) and ratio of peak velocity of early diastolic transmitral flow to peak velocity of late transmitral flow (r = 0.5515). In multiple regression analysis, only age was significantly related to the strain/SR and volumetric change indices, indicating conduit function. Left atrial speckle tracking echocardiographic analysis provided useful information to assess the LA function in healthy dogs. The influencing factors on strain and SR variables including the age, body weight, and heart rate should be considered in interpretation of these parameters in a clinical setting.

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