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Intrabiliary Pressure Changes Produced by Narcotic Drugs and Inhalation Anesthetics in Guinea Pigs

Jaime E. Arguelles, MD^*, Yagoda Franatovic, MD, Francisco Romo-Salas, MD^*, and J. Antonio Aldrete, MD

*Resident. Department of Anesthesiology, University of Colorado Medical Center, 4200 East Ninth Avenue, Denver, Colorado 80262. Research Assistant. Department of Anesthesiology, University of Colorado Medical Center, 4200 East Ninth Avenue, Denver, Colorado 80262. Professor and Chairman. Department of Anesthesiology, University of Colorado Medical Center, 4200 East Ninth Avenue, Denver, Colorado 80262.

Abstract

The effects of narcotic analgesic agents and two inhalation anesthetics on intrabiliary pressure (IBP) were measured before and after morphine (0.2 mg/kg), meperidine (2 mg/kg), fentanyl (0.002 mg/kg), or pentazocine(1 mg/kg) given intramuscularly to guinea pigs, and after halothane (0.5, 1.0, 1.5, or 2.0 MAC) or enflurane (same range of MAC) administered by inhalation. All narcotics except pentazocine significantly increase IBP, the increases ranging from 85.7% for meperidine to 143.4% for fentanyl. Pentazocine had no effect on IBP. Peak IBP increases occurred between 9 and 18 minutes after administration. The elevation of IBP produced by narcotics was reversed by atropine (0.05 mg/kg). No statistically significant alterations of IBP were noted during halothane or enflurane anesthesia.

Key Words: LIVER: biliary tract • ANALGESICS, Narcotic: biliary tract • ANESTHETICS, Volatile: halothane • ANESTHETICS, Volatile: enflurane.

Anesthesia & Analgesia® is published for the International Anesthesia Research Society® by Lippincott Williams & Wilkins with the assistance of Stanford University Libraries' HighWire Press®. Copyright 2006 by the International Anesthesia Research Society. Online ISSN: 1526-7598   Print ISSN: 0003-2999