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Retrospective evaluation of pimobendan and sildenafil therapy for severe pulmonary hypertension due to lung disease and hypoxia in 28 dogs (2007-2013).
Veterinary Medicine and Science 2017 May
Pulmonary hypertension (PH) is the persistent abnormal increase in pulmonary artery (PA) pressure and in dogs is usually secondary to congenital disease causing pulmonary over circulation, chronic respiratory disease and elevated left atrial pressure. Sildenafil (SF) is a phosphodiesterase (PDE) V inhibitor that causes pulmonary artery (PA) vasodilation by increasing pulmonary vascular concentrations of cyclic guanosine monophosphate which subsequently increases the activity of endogenous nitric oxide. Pimobendan (PB) is a PDE III inhibitor with calcium sensitizing effects thereby exerting positive inotropy and vasodilation. The purpose of this retrospective study was to evaluate the long-term survival of dogs with severe PH treated with SF and PB compared to SF alone. The use of PB in combination with SF did not result in a statistically significant increase in survival times in dogs with pulmonary hypertension secondary to chronic respiratory disease compared to SF alone.
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