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Acute burn down regulates rabbit splanchnic and renal prostanoid release
S I Myers1, R Hernandez, A Riva
1Department of Surgery, University of Texas Southwestern Medical Center, Dallas, USA.
Prostaglandins, Leukotrienes, and Essential Fatty Acids
|September 1, 1995
Summary
Acute thermal injury significantly reduces kidney and splanchnic vasodilator eicosanoids, like prostaglandins, 12 hours post-burn. This decrease may cause organ ischemia following burn injury.
Area of Science:
- Physiology
- Biochemistry
Background:
- Acute thermal injury, or burns, can lead to systemic complications.
- Eicosanoids, such as prostaglandins, play a crucial role in regulating blood flow and vascular tone.
Purpose of the Study:
- To investigate the hypothesis that acute thermal injury decreases renal and splanchnic vasodilator eicosanoids.
- To understand the role of these eicosanoids in post-burn organ perfusion.
Main Methods:
- Anesthetized rabbits underwent sham or 25% total body surface area burn with fluid resuscitation.
- Renal and splanchnic arteries were cannulated and perfused in vitro.
- Release of prostaglandins (PGI2, PGE2) and thromboxane B2 (TxB2) was measured via enzyme immunoassay (EIA).
Main Results:
- The primary eicosanoids released were PGI2 (prostacyclin) from the splanchnic bed and PGI2 and PGE2 from the kidney.
- Renal PGE2 and PGI2, and splanchnic PGI2 release decreased by over 50% at 12 hours post-burn (p < 0.01).
- These eicosanoid levels returned to sham burn levels by 24 hours post-burn.
Conclusions:
- Acute thermal injury leads to a significant reduction in key renal and splanchnic vasodilator eicosanoids.
- The diminished release of these vasodilators at 12 hours post-burn may contribute to ischemia in these vascular beds.
- Restoration of eicosanoid levels by 24 hours suggests a dynamic recovery process.