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  • Title: Excretory pattern of bile during phototherapy.
    Author: Berant M, Brik R, Alon U, Makhul I, Diamond E, Mordochowitz D.
    Journal: Biol Neonate; 1984; 45(1):11-6. PubMed ID: 6692012.
    Abstract:
    We studied the acute effects of phototherapy (PT) on bile flow and on the biliary excretion of bilirubin pigments and of bile salts in male homozygous Gunn rats (120-150 g). 13 rats received PT and 10 rats were kept in the dark. Bile was collected by cannulation of the common bile duct at hourly intervals from 1 h prior to PT till after 4 h of 'lights on'. Before treatment, all values were similar in both groups. After 4 h of lights on, mean plasma bilirubin fell from 145.3 +/- 4.3 to 99.2 +/- 2.7 mumol/l (p less than 0.01) in the PT rats, but did not change in the controls. During the lights-on period, PT rats had a significantly higher hourly bile volume, and a higher excretion of biliary bilirubin and bile salts than the controls (p less than 0.005). Over the total 4-hour lights-on period, the PT group had a higher mean output of bile than the controls (0.93 +/- 0.17 vs. 1.52 +/- 0.34 ml/4 h; p less than 0.005) and an increased excretion of bilirubin (0.08 +/- 0.016 vs. 0.148 +/- 0.01 mumol/4 h; p less than 0.005) and bile salts (35.1 +/- 3.7 vs. 55.2 +/- 12.5 mumol/4 h; p less than 0.005). The results show that PT of the Gunn rat is associated with a rise in bile flow and with an increased excretion of bile salts, in addition to an increased biliary bilirubin output.
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