Intestinal Blood Flow. An Evaluation by Clearance of Xenon Xe 133 From the Canine Jejunum
Clearance of a parenchymal injection of xenon 133Xe from the jejunum was used to assess changes in tissue perfusion produced by variations in superior mesenteric artery flow resulting from partial aortic occlusion. Disappearance of xenon from submucosa and muscularis was similar and reproducible. The biexponential function of the isotope clearance exhibited a rapid initial component representing mean flow. Calculated xenon clearance rates, expressed as half-times for isotope disappearance and plotted as a function of decreasing superior mesenteric artery flow, were characteristically rapid for a broad range of superior mesenteric artery flows (90 to 600 ml/min). With reduction of superior mesenteric artery flow beyond 10 ± 10 ml/min, tissue clearance of xenon was markedly prolonged. Adequate perfusion of the vascular compartments of the small bowel as measured by xenon clearance was maintained until 80 percent reduction of superior mesenteric artery flow.
- Research Organization:
- Wadsworth Hospital Center, Los Angeles
- Sponsoring Organization:
- USDOE
- NSA Number:
- NSA-33-029886
- OSTI ID:
- 4036134
- Journal Information:
- Archives of Surgery (Chicago), Journal Name: Archives of Surgery (Chicago) Journal Issue: 7 Vol. 110; ISSN 0004-0010
- Country of Publication:
- United States
- Language:
- English
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