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American Journal of Roentgenology, Vol 99, 606-611, Copyright © 1967 by American Roentgen Ray Society

CAPNOSPLENOPORTOGRAPHY

ASSESSMENT OF PORTAL VEIN PATENCY IN DOGS WITH CARBON DIOXIDE GAS

FLORENCIO A. HIPONA M.D.1 and WILLIAM M. PARK M.B., CH,B., D.M.R.D2

1 Assistant Professor of Radiology
2 Instructor in Radiology, St. George's Hospital, London, England

The use of carbon dioxide gas as a radio-negative contrast agent in splenoportography under experimental conditions is reported.

The portal venous system in dogs was studied in the normal, after partial and complete occlusion of the portal vein, and in simulated portal hypertension. Comparative serial roentgenograms were made employing 6o per cent methyiglucamine diatrizoate and carbon dioxide gas.

Splenoportography with carbon dioxide gas demonstrates partial or complete occulusios of the portal vein either directly or via collateral vessels. Similar results are not reproduced consistently using conventional positive contrast agents when the blood flow is mainly hepatofugal.

In artificially induced portal venous hypertension carbon dioxide splenoportography demonstrates very well the patency of the portal vein. Using 6o per cent methyl-glucamine diatrizoate, there is poor visualization of the portal vein due to a mixing defect (streaming), dilution of contrast material and prolonged transit time in the portal vein.

The ideal position is a left posterior oblique projection. The duration of examination in the normal is 10 seconds, optimal demonstration of the portal vein occurring 2-4 seconds from the start of injection. This does not appreciably change even under induced experimental pathology. A dose of 2-3 cc./kg. carbon dioxide gas is adequate for good visualization of the splenoportal venous system.

Capnosplenoportography is a feasible examination in the experimental animal. It has clinical applicability in patients who are hypersensitive to iodinated contrast media and in instances where there is nonvisualization of the portal vein by conventional splenoportography.


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 Am. J. Roentgenol.Home page
J. G. Caridi, I. F. Hawkins Jr., K. Cho, S. Y. Sohn, M. R. Langham Jr., B. N. Weichmann, and S. D. Klioze
CO2 Splenoportography: Preliminary Results
Am. J. Roentgenol., May 1, 2003; 180(5): 1375 - 1378.
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