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Figure 1 Comparison of the effects of inhaled nitric oxide (NO, 40 ppm for 15 min) and aerosolized iloprost (14 to 17 µg over 15 min) on pulmonary artery pressure (A), cardiac output (B) and pulmonary vascular resistance (C) in 35 patients with primary pulmonary hypertension. Dots represent the individual responses compared to baseline, expressed as percentage. A location below the line of identity indicates a more pronounced effect of iloprost, while a location above the line of identity reflects a more pronounced effect of NO.