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THE EFFECT OF PEPTONE ON THE PERIPHERAL CIRCULATION
1Laboratories of Pathology and Anatomy of Northwestern University Medical School, Chicago.
The Journal of Experimental Medicine
|October 30, 2009
Summary
Peptone shock in dogs causes a temporary leg volume increase, then a decrease below baseline. This suggests blood is impounded elsewhere, not solely due to peripheral vasodilation during shock.
Area of Science:
- Cardiovascular Physiology
- Animal Models in Research
Background:
- Peptone shock is a model for anaphylactic shock, characterized by prolonged hypotension.
- The precise mechanisms of hypotension in peptone shock, particularly the role of peripheral vasodilation, require further elucidation.
Purpose of the Study:
- To investigate the immediate effects of peptone injection on limb volume in dogs.
- To correlate changes in leg volume with arterial pressure fluctuations during peptone shock.
Main Methods:
- Direct intra-arterial injection of peptone solution into the leg artery of canine subjects.
- Monitoring of leg volume and arterial blood pressure in response to peptone administration.
Main Results:
- Intra-arterial peptone injection induced a transient increase in leg volume, followed by a rapid decrease below pre-injection levels.
- The temporal dynamics of leg volume changes were closely related to alterations in arterial pressure.
- The observed peripheral volume changes were insufficient to explain the prolonged hypotension seen in peptone shock.
Conclusions:
- Peripheral vasodilation may contribute to the onset but not the maintenance of hypotension in peptone and anaphylactic shock.
- The findings suggest a significant "impounding" or sequestration of blood in other body regions during shock states.
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