“…The first available agent of this type was the American preparation Visco-Rayopak in which polyvinyl alcohol was used to increase the viscosity. It was shown by MORALES (1948), that this preparation exerts more than negligible irritation. MORALES & HEIWINCKEL (1948) consequently prepared Umbradil-Viscous H in which the viscosity was increased by the mixture of carboxymethyl cellulose.…”
“…The first available agent of this type was the American preparation Visco-Rayopak in which polyvinyl alcohol was used to increase the viscosity. It was shown by MORALES (1948), that this preparation exerts more than negligible irritation. MORALES & HEIWINCKEL (1948) consequently prepared Umbradil-Viscous H in which the viscosity was increased by the mixture of carboxymethyl cellulose.…”
“…This requires a well distributed and more complete topical anesthesia. 4. Details of technique are described and illustrative bronchograms are presented.…”
Section: Effects Of Contrast Media On the Lung Parenchymamentioning
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