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Background  Patent ductus arteriosus ( PDA ) is one of the most common congenital heart defects in dogs. Advanced echocardiographic techniques such as speckle‐tracking echocardiography ( STE ) have not been extensively used to evaluate cardiac function in affected dogs.    Hypothesis  Advanced echocardiographic techniques are more sensitive than standard echocardiographic techniques in analyzing systolic function in dogs with  PDA .    Animals  Forty‐four client‐owned dogs: 34 dogs with  PDA  (preoperative evaluation) and 10 healthy sex‐ and weight‐matched controls.    Methods  Prospective study. Dogs were recruited over a 2‐year period. Complete echocardiographic evaluation was performed, including conventional (end‐diastolic volumes indexed to body surface area in B and M‐mode [ EDVI B   /M ], end‐systolic volumes indexed to body surface area in B and M‐mode [ ESVI B   /M ], allometric scaling in diastole and systole [AlloD/S], pulmonary flow to systemic flow [Qp/Qs], ejection fraction [ EF ] and fractional shortening [ FS ]) and speckle‐tracking echocardiography ([ STE ]: global longitudinal, radial and circumferential strain [S] and strain rate [ SR ]).    Results  Dogs with  PDA  had significantly different  EDVI B   /M ,  ESVI B   /M , AlloD/S, Qp/Qs and all  STE ‐derived parameters (global longitudinal S and  SR , global circumferential S and  SR , global radial S and  SR )compared to healthy dogs. No correlation was found between standard techniques ( EDVI B   /M ,  ESVI B   /M , AlloD/S, Qp/Qs) and  STE ‐derived parameters (global longitudinal, circumferential and radial S and  SR ).    Conclusion and Clinical Importance  Conventional parameters routinely used to assess systolic function ( EF  and  FS ) were not different between the groups;  STE ‐derived parameters identified subtle changes in cardiac systolic function and contractility between the 2 groups of dogs. Based on these findings,  STE  may be a more appropriate tool to assess cardiac contractility in dogs with  PDA .

Echocardiographic Assessment of Cardiac Function by Conventional and Speckle‐Tracking Echocardiography in Dogs with Patent Ductus Arteriosus