The effect of morbid obesity on morphine glucuronidation.

Abstract:

:The purpose of the present work was to study the change in morphine metabolic ratio in obese subjects before and after Roux-en-Y Gastric Bypass (RYGB) and to identify clinical and/or biological factors associated with this change. The pharmacokinetics (PK) of oral morphine (30mg), morphine-3-glucuronide (M3G) and morphine-6-glucuronide (M6G) was performed in patients before (n=25; mean BMI=43.2 (35.4-61.9)kg/m2), 7-15days (n=16) and 6 months after RYGB (n=19; mean BMI=32.3 (25.4-46.0)kg/m2). Morphine Cmax and AUC0-inf were significantly increased and morphine Tmax significantly shortened at 6 months after RYGB compared with preoperative data, indicating an important increase in the rate and extent of morphine absorption. The morphine metabolic ratio 0-inf M3G+M6G/Morphine, decreased significantly from the preoperative to 6 months postoperative period with an average of -26% (range -74%; +21%; p=0.004), but not in the immediate post-operative period. The change in morphine metabolic ratio was associated with a change in BMI, fat mass in kg, and triglyceride levels (rho=0.5, p≤0.04). The degree of change in several markers of low-grade inflammation, or the level of liver steatosis and fibrosis before surgery, was not associated with the change in morphine metabolic ratios. Our findings indicate that RYGB-induced weight loss significantly decreases morphine metabolic ratio, arguing for an effect of morbid obesity on glucuronidation. With glucuronide exposure at 6 months similar to preoperative values, a higher morphine AUC0-inf should encourage reducing morphine dosage in patients undergoing RYGB and chronically receiving immediate-release oral morphine.

journal_name

Pharmacol Res

journal_title

Pharmacological research

authors

Lloret-Linares C,Luo H,Rouquette A,Labat L,Poitou C,Tordjman J,Bouillot JL,Mouly S,Scherrmann JM,Bergmann JF,Declèves X

doi

10.1016/j.phrs.2016.08.031

subject

Has Abstract

pub_date

2017-04-01 00:00:00

pages

64-70

eissn

1043-6618

issn

1096-1186

pii

S1043-6618(16)30855-6

journal_volume

118

pub_type

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