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Body fluid compartment changes during burn shock in the guinea pig
Circulatory Shock
|January 1, 1980
Summary
Severe burns rapidly shift body fluids, causing initial hemoconcentration due to plasma loss. However, total body water remains stable, indicating rapid fluid redistribution in burn shock without overall fluid deficit.
Area of Science:
- Physiology
- Burn Medicine
- Fluid Dynamics
Background:
- Burns cause significant physiological stress, particularly affecting fluid balance and hemodynamics.
- Understanding rapid fluid shifts is crucial for managing burn shock and preventing complications.
Purpose of the Study:
- To investigate the immediate alterations in body fluid compartments following a major burn.
- To concurrently assess hemodynamic changes in response to burn injury.
Main Methods:
- Conscious guinea pigs with a 70% full-skin thickness burn were studied.
- Body fluid compartments, hematocrit, cardiac output, heart rate, and mean arterial blood pressure were measured at 1, 4, and 8 hours postburn.
Main Results:
- Cardiac output and heart rate decreased at 1 hour; mean arterial blood pressure decreased at 8 hours postburn.
- Initial hemoconcentration (increased hematocrit) resulted from plasma volume loss, while red blood cell volume remained constant.
- Extracellular fluid initially decreased but normalized by 4-8 hours; total body water and body weight did not differ from controls.
Conclusions:
- Major burns induce rapid fluid redistribution within the body, primarily affecting plasma volume.
- Despite significant initial fluid shifts and hemodynamic changes, total body water is conserved, suggesting efficient internal redistribution rather than net fluid loss.