Hemodynamic effect of iloprost inhalation and oral sildenafil during acute vasoreactivity test in pulmonary arterial hypertension.

Background: The vasoreactivity test is usually performed to identify pulmonary arterial hypertension (PAH) patients who may benefit from long-term calcium channel blocker (CCB). The first and most commonly used agent is intravenous epoprostenol. A few other agents such as intravenous adenosine and inhaled nitric oxide are also used.