“…Medical records of dogs that underwent echocardiographic evaluation were retrospectively reviewed by a single author (KW). Standardized written reports (written by a cardiologist, a cardiology resident with direct cardiologist supervision, or a veterinarian residency‐trained in cardiology) were evaluated for the following information: left atrial size, presence or absence of tricuspid regurgitation (TR), velocity of TR (when available in report), right atrial (RA)‐to‐right ventricular (RV) pressure gradient (calculated based on TR velocity using the modified Bernoulli equation 17 ), septal flattening, decreased or underfilled left ventricular size, presence or absence of RV hypertrophy, RV systolic function (based on tricuspid annular plane systolic excursion [TAPSE]), main pulmonary artery‐to‐aorta (PA : Ao) ratio >1, presence of PR velocity >2.5 m/s, presence of right pulmonary artery distensibility (RPAD) index <30%, abnormalities in RV outflow profile (acceleration time <58 ms, acceleration‐to‐ejection time ratio <0.30, or systolic notching of the profile), presence of RA enlargement, and enlargement of the caudal vena cava (CVC). When available, raw echocardiographic images (originally obtained by a cardiologist, a cardiology resident with direct cardiologist supervision, or a veterinarian residency‐trained in cardiology) were reviewed for additional information that was not included in the written report.…”