PT - JOURNAL ARTICLE AU - Ring, John A. AU - Ghabrial, Hany AU - Ching, Michael S. AU - Shulkes, Arthur AU - Smallwood, Richard A. AU - Morgan, Denis J. TI - Propranolol Elimination by Right and Left Fetal Liver: Studies in the Intact Isolated Perfused Fetal Sheep Liver DP - 1998 Feb 01 TA - Journal of Pharmacology and Experimental Therapeutics PG - 535--541 VI - 284 IP - 2 4099 - http://jpet.aspetjournals.org/content/284/2/535.short 4100 - http://jpet.aspetjournals.org/content/284/2/535.full SO - J Pharmacol Exp Ther1998 Feb 01; 284 AB - Propranolol extraction in vivo by the left lobe of the fetal sheep liver is greater than that by the right lobe, and this may be due to the fact that oxygenation of the left lobe is greater than that of the right lobe. To explore this hypothesis, we studied the elimination of (R)-(+)-propranolol (PROP) by right and left lobes of the intact isolated perfused fetal sheep liver model, in which there is equal oxygenation of both liver lobes. After isolation of the liver, near-term fetal sheep livers (n = 11) were perfused (2.68 ± 1.05 ml/g liver/min) in situvia the umbilical vein in a 1-liter recirculating system. PROP was infused (1.2 mg/hr) into the reservoir after an initial bolus dose (2.3 mg). Perfusate samples were taken from the common and right and left hepatic veins every 10 min for determination of PROP concentrations and oxygen consumption over the 180-min experimental period. Mean ductus venosus shunt through the liver was 42 ± 21% of perfusate flow. Oxygen consumption was not significantly different between the left and right lobes of the liver (0.79 ± 0.46 and 0.67 ± 0.44 μmol/g liver/min, respectively, P > .05), nor was there any significant difference between lobes in PROP hepatic extraction at steady state (0.25 ± 0.20 and 0.25 ± 0.23, respectively, P > .05). This supports the hypothesis that the difference between lobes in PROP extractionin vivo may be due to the difference in degree of oxygenation of the left and right lobes that is known to be presentin vivo. The American Society for Pharmacology and Experimental Therapeutics