Hepatic Effects of Thoracic Epidural Analgesia in Experimental Severe Acute Pancreatitis

Thoracic epidural anesthesia (TEA) protects the intestinal microcirculation and improves perioperative outcomes. TEA also reduces mortality in acute experimental pancreatitis. Its impact on hepatic microcirculation, however, in health and critical illness is unknown. Therefore, the authors studied t...

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Bibliographic Details
Published in:	Anesthesiology (Philadelphia) Vol. 111; no. 6; pp. 1249 - 1256
Main Authors:	FREISE, Hendrik, LAUER, Stefan, KONIETZNY, Eva, HINKELMANN, Juergen, MININ, Evgeni, VAN AKEN, Hugo K, LERCH, Markus M, SIELENKAEMPER, Andreas W, FISCHER, Lars G
Format:	Journal Article
Language:	English
Published:	Hagerstown, MD Lippincott Williams & Wilkins 01-12-2009
Subjects:	Acute Disease Analgesia, Epidural - adverse effects Anesthesia Anesthesia. Intensive care medicine. Transfusions. Cell therapy and gene therapy Animals Apoptosis - drug effects Biological and medical sciences Blood Pressure - drug effects Carbon Dioxide - blood Critical Illness Fas Ligand Protein - metabolism Hemodynamics - physiology Hindlimb - physiology Laparotomy Liver - drug effects Liver Circulation - drug effects Macrophage Activation - drug effects Male Medical sciences Microcirculation - drug effects Movement - physiology Oxygen - blood Pancreatitis - pathology Rats Rats, Sprague-Dawley Extradural Analgesia Liver Pancreatitis Digestive diseases Anesthesia Pancreatic disease
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Summary:	Thoracic epidural anesthesia (TEA) protects the intestinal microcirculation and improves perioperative outcomes. TEA also reduces mortality in acute experimental pancreatitis. Its impact on hepatic microcirculation, however, in health and critical illness is unknown. Therefore, the authors studied the effect of TEA on the liver in healthy rats and in experimental severe acute pancreatitis. TEA was induced by 15 microl/h bupivacaine, 0.5%. Necrotizing pancreatitis was induced by intraductal infusion of 2 ml/kg taurocholic acid, 5%. Twenty-eight rats were assigned to either Sham operation, Sham + TEA, Pancreatitis, or Pancreatitis + TEA. After 15 h, mean arterial pressure, heart rate, and respiratory function were recorded. Sinusoidal width and perfusion rate and the intrahepatic leukocyte adhesion were assessed by intravital microscopy. In an additional 22 rats randomly assigned to Sham, Pancreatitis, and Pancreatitis + TEA, hepatic apoptosis was evaluated by staining for single-stranded DNA and Fas ligand-positive cells. TEA did not affect hepatic microcirculation and leukocyte adhesion in healthy rats. Blood pressure remained unchanged in the Sham + TEA group. In Pancreatitis, mean arterial pressure decreased from 141 + or - 6 mmHg to 127 + or - 13 mmHg but remained stable in Pancreatitis + TEA. The sinusoidal diameter decreased from 5.4 + or - 0.1 microm to 5.0 + or - 0.2 microm in Pancreatitis. This was restored in Pancreatitis + TEA. Intrahepatic leukocyte adhesion was not affected by TEA. The increased hepatocyte apoptosis in Pancreatitis was abolished in Pancreatitis + TEA. This might be mediated by inhibition of the Fas ligand pathway. TEA reduces liver injury in necrotizing acute pancreatitis. This could be related to a regional sympathetic block. TEA could thus preserve liver function in systemic inflammatory disorders such as acute pancreatitis.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	0003-3022 1528-1175
DOI:	10.1097/ALN.0b013e3181c1494e