Figure 4. Effects of (a) diatrizoate, (b) ioxaglate, (c) iotrolan and (d) iopromide on pulmonary artery pressure (Ppa mmHg) when raised by ventilation with hypoxia (2% O₂+5% CO₂). Results are expressed as percentagechange (mean±SEM) of the rise in Ppa with hypoxia from baseline (HPV). A schematic diagram of the changes in Ppa in response to 0.3 ml of RCM is shown. (N.B. The time-scale of the schematic diagram is the same for each figure.)