Abstract
A clinical comparison of the effects on pulmonary arterial pressure produced by iohexol and diatrizoate, following selective pulmonary angiography, was made in 17 patients with a normal pressure before the injection of the contrast medium. A double blind crossover study was performed and each contrast medium was administered in random order. the pulmonary arterial pressure was continuously recorded before, during and after the injection for 3 minutes. the effect of iohexol on the pulmonary arterial pressure was significantly less than that of diatrizoate. the results indicated that iohexol should be better tolerated than diatrizoate and therefore a safer contrast medium for selective pulmonary angiography