Surgical treatment of severe pulmonic stenosis under cardiopulmonary bypass in small dogs.

Abstract

OBJECTIVES: The aim of this study was to report the long-term outcome of the surgical palliation of pulmonic stenosis in dogs. METHODS: The subjects comprised three female and six male dogs, mean (&#xb1;sd) age: 23 (&#xb1;25) months, mean (&#xb1;sd) weight: 3&#xb7;4 (&#xb1;2&#xb7;1) kg, diagnosed with severe pulmonic stenosis and right ventricular hypertrophy, with an average preoperative pressure gradient of 153 (&#xb1;43) mmHg on echocardiography. RESULTS: The pressure overload with severe pulmonic stenosis was reduced by valvotomy, i.e., open pulmonary valve commissurotomy, with/without biomembrane patch grafting, under cardiopulmonary bypass. The postoperative pressure gradient at 1 to 7 days was significantly decreased to 65 (&#xb1;39) mmHg (P<0&#xb7;05). The reduced pressure gradient was maintained at 58 (&#xb1;38) mmHg at final follow-up. CLINICAL SIGNIFICANCE: Open valvotomy, pulmonary valve commissurotomy and biomembrane patch grafting were effective in reducing obstruction in severe pulmonic stenosis in dogs.