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Background  Echocardiography is a cost‐efficient method to screen cats for presence of heart disease. Current reference intervals for feline cardiac dimensions do not account for body weight ( BW ).    Objective  To study the effect of  BW  on heart rate ( HR ), aortic (Ao), left atrial ( LA ) and ventricular ( LV ) linear dimensions in cats, and to calculate 95% prediction intervals for these variables in normal adult pure‐bred cats.    Animals  19 866 pure‐bred cats.    Methods  Clinical data from heart screens conducted between 1999 and 2014 were included. Associations between  BW ,  HR , and cardiac dimensions were assessed using univariate linear models and allometric scaling, including all cats, and only those considered normal, respectively. Prediction intervals were created using 95% confidence intervals obtained from regression curves.    Results  Associations between  BW  and echocardiographic dimensions were best described by allometric scaling, and all dimensions increased with increasing  BW  (all  P <0.001). Strongest associations were found between  BW  and Ao,  LV  end diastolic,  LA  dimensions, and thickness of  LV  free wall. Weak linear associations were found between  BW  and  HR  and left atrial to aortic ratio ( LA :Ao), for which  HR  decreased with increasing  BW  ( P <0.001), and  LA :Ao increased with increasing  BW  ( P <0.001). Marginal differences were found for prediction formulas and prediction intervals when the dataset included all cats versus only those considered normal.    Conclusions and Importance   BW  had a clinically relevant effect on echocardiographic dimensions in cats, and  BW  based 95% prediction intervals may help in screening cats for heart disease.

Effect of Body Weight on Echocardiographic Measurements in 19,866 Pure‐Bred Cats with or without Heart Disease