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Background  The assessment of left atrial ( LA ) function by 2‐dimensional speckle tracking echocardiography ( STE ) holds important clinical implications in human medicine. Few similar data are available in dogs.    Objectives  To assess  LA  function by  STE  in dogs with and without myxomatous mitral valve disease ( MMVD ), analyzing  LA  areas, systolic function, and strain.    Animals  One hundred and fifty dogs were divided according to the American College of Veterinary Internal Medicine classification of heart failure: 23 dogs in class A, 52 in class B1, 36 in class B2, and 39 in class C + D.    Methods  Prospective observational study. Conventional morphologic and Doppler variables,  LA  areas, and  STE ‐based  LA  strain analysis were performed in all dogs and results were compared among groups. Correlation analysis was carried out between  LA STE  variables and other echocardiographic variables.    Results  Variability study showed good reproducibility for all the tested variables (coefficient of variation <16%). Left atrial areas, fractional area change, peak atrial longitudinal strain ( PALS ), peak atrial contraction strain, and contraction strain index ( CSI ) differed significantly between groups B2 and C + D and all the other groups (overall  P  < .001), whereas only  PALS  differed between groups B1 and A ( P  = .01). Left atrial areas increased with progression of the disease, whereas  LA  functional parameters decreased. Only  CSI  increased nonsignificantly from group A to group B1 and then progressively decreased. Thirty‐one significant correlations ( P  < .001,  r  > .3) were found between conventional left heart echocardiographic variables and  LA  areas and strain variables.    Conclusions and Clinical Importance  Left atrial  STE  analysis provides useful information on atrial function in the dog, highlighting a progressive decline in atrial function with worsening of  MMVD .

journal of veterinary internal medicine

Assessment of Left Atrial Deformation and Function by 2‐Dimensional Speckle Tracking Echocardiography in Healthy Dogs and Dogs With Myxomatous Mitral Valve Disease