Problem: The nurse is reviewing the charts of several patients. Which conditions should cause the nurse to question an order for sildenafil? (Select three answers) The nurse is reviewing the charts of several patients. Which conditions should cause the nurse to question an order for sildenafil? (Select three answers) Taking ketoconazole for a fungal infection Pulmonary arterial hypertension History of priapism Taking doxazosin for hypertension Taking nitroglycerin for angina