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The use of alpha blocking and beta stimulating drugs in combination to improve opacification of the portal venous system.

Efforts to improve opacification of the portal venous system, involving increasing the vasodilatory effect of a beta adrenergic stimulator by adding an alpha adrenergic blocker, have been made. It was determined that the combination of phentolamine (Regitine) and isoproterenol (Isuprel) results in distinctly improved arterial portograms compared to the control studies.