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Direct energy delivery improves tissue perfusion after resuscitated shock
El Rasheid Zakaria1, William D Ehringer, Nina Tsakadze
1Department of Physiology and Biophysics, University of Louisville, KY 40292, USA. erzaka01@louisville.edu
Surgery
|September 13, 2005
Summary
Conventional resuscitation fails to restore intestinal blood flow after hemorrhagic shock. Direct intravenous delivery of VitaSol (lipid-encapsulated ATP) improves intestinal perfusion and survival by enhancing cellular energy delivery.
Area of Science:
- Physiology
- Biochemistry
- Resuscitation Medicine
Background:
- Conventional resuscitation (CR) from hemorrhagic shock (HS) inadequately restores intestinal blood flow and cellular energy production.
- Indicators of anaerobic metabolism suggest compromised cellular energy status during HS and CR.
Purpose of the Study:
- To investigate if direct intravenous delivery of lipid-encapsulated high-energy phosphates (VitaSol) improves intestinal perfusion during HS and resuscitation.
- To evaluate the impact of VitaSol on cellular energy delivery and tissue perfusion in a rat model of HS.
Main Methods:
- Hemorrhagic shock (HS) was induced in male rats, followed by resuscitation (RES) with or without VitaSol (lipid-encapsulated ATP).
- Intestinal microvessel diameters and blood flow were measured using in vivo videomicroscopy and Doppler velocimetry.
- Survival rates and tissue water content were assessed to evaluate the efficacy of VitaSol resuscitation.
Main Results:
- HS caused selective vasoconstriction in intestinal arterioles, leading to progressive hypoperfusion after CR.
- VitaSol administration during CR enhanced premucosal arteriole dilation and augmented intestinal blood flow above prehemorrhage levels.
- CR alone resulted in 20% mortality, while adjunct VitaSol resuscitation achieved 100% survival with reduced tissue edema.
Conclusions:
- Conventional resuscitation leads to progressive intestinal hypoperfusion.
- Direct intravenous energy delivery via VitaSol effectively resuscitates intestinal cells, improving perfusion, survival, and reducing tissue edema after HS.