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[Hemodynamic changes in normovolemic and hypovolemic canines during epidural block]
1First People's Hospital, Shanghai.
Zhonghua Wai Ke Za Zhi [Chinese Journal of Surgery]
|March 1, 1992
Summary
Epidural block in canines affects hemodynamics, decreasing blood pressure and resistance. In hypovolemic states, this can lead to abrupt changes and potential liver injury, requiring careful management.
Area of Science:
- Anesthesiology
- Cardiovascular Physiology
- Veterinary Medicine
Context:
- Epidural anesthesia is commonly used in veterinary and human medicine.
- Understanding its hemodynamic effects is crucial for patient safety, especially in compromised states.
- Limited data exists on epidural block's impact on hepatic and renal hemodynamics.
Purpose:
- To investigate the hemodynamic alterations induced by epidural block in both normovolemic and hypovolemic canine models.
- To assess the changes in systemic, hepatic, and renal vascular resistance and blood flow.
- To identify potential risks associated with epidural block in hypovolemic conditions.
Summary:
- In normovolemic canines, epidural block resulted in increased stroke volume, decreased heart rate, and reduced systemic, hepatic, and renal vascular resistance.
- Hepatic and renal blood flow per beat increased, but total hepatic blood flow decreased.
- In hypovolemic canines, similar but more abrupt changes occurred, with a significant decrease in hepatic blood flow and potential risk of liver ischemia.
Impact:
- Highlights the significant hemodynamic effects of epidural block, particularly in hypovolemia.
- Suggests the need for vigilance regarding potential hepatic ischemic injury during epidural anesthesia in volume-depleted patients.
- Emphasizes the importance of careful hemodynamic monitoring and management in hypovolemic canines undergoing epidural procedures.