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1From the Department of Anesthesia and Critical Care, Stanford University School of Medicine, Stanford, California; and the Department of Anesthesiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California.
Abstract:
The Solubility of Halothane in Blood and Tissue Homogenates. By Larson CP, Eger EI, Severinghaus JW. Anesthesiology 1962; 23:349-55. Measured samples of human and bovine blood, human hemoglobin, and tissue homogenates from human fat and both human and bovine liver, kidney, muscle, whole brain, and separated gray and white cortex were added to stoppered 2,000-ml Erlenmeyer flasks. To each flask, 0.1 ml of liquid halothane was added under negative pressure using a calibrated micropipette. After the flask was agitated for 2 to 4 h to achieve equilibrium between the gas and blood or tissue contents, a calibrated infrared halothane analyzer was used to measure the concentration of halothane vapor. Calculated partition coefficients ranged from 0.7 for water to 2.3 for blood and from 3.5 for human or bovine kidney to 6 for human whole brain or liver and 8 for human muscle. Human peritoneal fat had a value of 138. The human blood-gas partition coefficient of 2.3 as determined by this equilibration method was well below the previously published value of 3.6.
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