Evaluation of cardiothoracic ratios in clinically healthy cats using planimetric analysis of standard radiographic projections

Potential influence of general anesthesia and the specific phase of the cardiac cycle on the cardiac silhouette measurements, as well as the possibility of subtle misalignments or rotational errors during image acquisition, could compromise the accuracy of cardiothoracic measurements. The reliability of the planimetric cardiothoracic ratio in reflecting cardiac size changes in feline heart disease necessitates additional study.