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Pentoxifylline restores intestinal microvascular blood flow during resuscitated hemorrhagic shock
W J Flynn1, H G Cryer, R N Garrison
1Department of Surgery, University of Louisville 40292.
Abstract:
We studied the intestinal microvascular blood flow responses to hemorrhage and resuscitation with pentoxifylline by in vivo video microscopy. Male Sprague-Dawley rats were hemorrhaged to 50% of baseline mean arterial pressure for 45 minutes and then blindly randomized to receive pentoxifylline (25 mg/kg bolus + 0.2 mg/kg/minute) or an equivalent volume of saline plus return of shed blood and an additional bled volume of Ringer's lactate solution. Hemorrhage caused intestinal microvascular blood flow to decrease to 10% to 15% of baseline values. In the control group, resuscitation restored cardiac output and mean arterial pressure to baseline values, but intestinal microvascular blood flow remained at 30% of baseline values. In contrast, addition of pentoxifylline to the resuscitation regimen resulted in an immediate hyperemic response with an increase in intestinal microvascular blood flow to significantly greater than baseline values followed by return to baseline. Arteriolar dilation was not responsible for the improvement in flow implicating improved flow dynamics between erythrocytes, granulocytes, and vascular endothelia within the microcirculation. We conclude that addition of pentoxifylline to resuscitation from hemorrhagic shock restores intestinal microvascular blood flow.
Insights
Pentoxifylline improves intestinal blood flow after hemorrhagic shock. This study shows pentoxifylline (a blood flow enhancer) significantly restores microvascular blood flow in the intestines during resuscitation, unlike standard treatments.
Area of Science:
- Physiology
- Pharmacology
- Critical Care Medicine
Background:
- Hemorrhagic shock severely impairs intestinal microvascular blood flow.
- Standard resuscitation may not fully restore intestinal perfusion.
- Understanding microcirculatory dysfunction is crucial for effective shock management.
Purpose of the Study:
- To investigate the effect of pentoxifylline on intestinal microvascular blood flow during resuscitation from hemorrhagic shock.
- To evaluate pentoxifylline's efficacy compared to standard resuscitation in restoring intestinal perfusion.
Main Methods:
- In vivo video microscopy was used to assess intestinal microvascular blood flow in rats subjected to hemorrhage.
- Rats were randomized to receive either pentoxifylline or saline during resuscitation.
- Hemorrhage was induced to 50% of baseline mean arterial pressure for 45 minutes.
Main Results:
- Hemorrhage reduced intestinal blood flow to 10-15% of baseline.
- Standard resuscitation restored systemic parameters but left intestinal blood flow at 30% of baseline.
- Pentoxifylline administration resulted in a hyperemic response, increasing intestinal blood flow beyond baseline levels.
Conclusions:
- Pentoxifylline significantly restores intestinal microvascular blood flow following hemorrhagic shock.
- The mechanism involves improved microcirculatory dynamics rather than arteriolar dilation.
- Pentoxifylline is a promising adjunct therapy for managing hemorrhagic shock and its intestinal complications.