Research Communications of the 27(th) ECVIM-CA Congress: Intercontinental, Saint Julian's, Malta, 14th to 16th September 2017

Tricuspid regurgitation was present in 57/131 (44%) of cats with L-CHF. Pulmonary hypertension was present in 22/131 of cats with L-CHF (17%). In 15/22 cases PH was associated with cardiomyopathy, in 5/22 cases with congenital heart disease, and in 2/22 cases to other causes. All cats with PH (22/22, 100%) had subjectively-assessed right-sided enlargement, with larger RA and RV diameters (P < 0.0001), thicker RV wall thickness (P < 0.05) and higher prevalence of septal flattening (6/22, 27%, P < 0.0001) in comparison to cats without PH. Pulmonary artery size and Doppler-derived STIs were not statistically different between cats with and without PH. Maximum right atrial diameter (>21.5 mm; Sensitivity [Sn] 0.82, Specificity [Sp] 0.42) and RV ventricular diameter (>7.8 mm; Sn 0.91, Sp 0.64) had the most accurate cutoff to predict PH compared to other variables. Method reproducibility (measurement variability) was good, with most coefficients of variation <15%.