G. H. Ira Jr., M.D.; E. S. Orgain, M.D., F.A.C.P.
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External detection of left to right cardiac shunting depends on the characteristics of the downslope of dilution curves that sample at a peripheral site with suitable materials, e.g., dye or radioisotopes. In principle, the injection site is relatively far removed from the sampling site, and the descending slope is influenced by numerous other factors besides the actual shunting. A sampling site closer to the injection site would improve the descending slope of the curves, especially if an actual recirculation "hump" could be demonstrated.
A new approach has been attempted, utilizing the esophagus as a means of placing a small Geiger-Muller
Ira GH, Orgain ES. A New Technique for the Detection of Left to Right Cardiac Shunts Using an Esophageal Geiger-Muller Tube.. Ann Intern Med. ;58:711. doi: 10.7326/0003-4819-58-4-711_1
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Published: Ann Intern Med. 1963;58(4):711.
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Print ISSN: 0003-4819 | Online ISSN: 1539-3704
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