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A case report is presented concerning the administration of ketanserin in the treatment of pulmonary vasoconstriction and right ventricular failure following the infusion of protamine in a patient undergoing coronary artery bypass surgery and mitral valve replacement.
 ( adverse event: following ,  a patient: Subject, pulmonary vasoconstriction and right ventricular failure: Effect, infusion of protamine: Treatment, undergoing coronary artery bypass surgery and mitral valve replacement: Treatment, protamine: Treatment.Drug, infusion: Treatment.Route) 
Locate the role in the text that participated in the event based on the event type and return it in the event list. 
 Option: Event type: adverse event,potential therapeutic event, Arguments type: Treatment.Disorder,Treatment.Time_elapsed,Treatment.Dosage,Subject.Race,Treatment.Drug,Treatment.Route,Subject.Disorder,Treatment.Freq,Treatment,Effect,Subject.Population,Treatment.Duration,Combination.Drug,Subject,Subject.Age,Subject.Gender. 
Text: {0} 
Answer:
 ( adverse event: following ,  a patient: Subject, pulmonary vasoconstriction and right ventricular failure: Effect, infusion of protamine: Treatment, undergoing coronary artery bypass surgery and mitral valve replacement: Treatment, protamine: Treatment.Drug, infusion: Treatment.Route) 