Right ventricular systolic function in dogs with pulmonary hypertension can be assessed using tissue motion annular displacement.

TMAD serves as a supplementary echocardiographic tool for assessing RV systolic function in dogs with pulmonary hypertension.

This case-control study evaluated right ventricular (RV) systolic function in dogs with pulmonary hypertension (PH) using conventional echocardiography alongside advanced techniques, specifically tissue motion annular displacement (TMAD) and speckle-tracking strain. The study included 46 dogs with PH (27 precapillary, 19 postcapillary) and 44 healthy control dogs evaluated between March 2018 and June 2022. All dogs underwent comprehensive cardiovascular evaluation including physical examination, blood pressure measurement, electrocardiography, and echocardiography. TMAD was measured as midpoint displacement in millimeters, as a percentage of RV length, and indexed to body weight (mm/kg) and body surface area (mm/m²). Key findings demonstrated that TMAD values were significantly lowest in dogs with precapillary PH compared to both the control group and dogs with postcapillary PH, suggesting greater RV systolic dysfunction in precapillary disease. TMAD indexed to body weight showed weak to moderate positive correlations with RV structural variables and fractional area change, a weak negative correlation with normalized tricuspid annular plane systolic excursion (TAPSE), and no significant correlation with tissue Doppler-derived tricuspid annular systolic velocity (S'). The authors concluded that TMAD does not replace conventional echocardiographic techniques but may serve as a valuable supplementary tool for assessing RV systolic function in canine PH, particularly for differentiating between PH subtypes and quantifying the degree of RV dysfunction.

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