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Sökning: WFRF:(van Schaik Ron H N) > Karolinska Institutet

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1.
  • Elens, Laure, et al. (författare)
  • Genetic Predisposition to Poor Opioid Response in Preterm Infants : Impact of KCNJ6 and COMT Polymorphisms on Pain Relief after Endotracheal Intubation
  • 2016
  • Ingår i: Therapeutic Drug Monitoring. - 0163-4356 .- 1536-3694. ; 38:4, s. 525-533
  • Tidskriftsartikel (refereegranskat)abstract
    • Background: Single-nucleotide polymorphisms in genes involved in pain control might predispose to exaggerated sensitivity or difference in opioid analgesic effect. The relevance of the KCNJ6 -1250G>A (rs6517442, c.-1787G>A) and the catecholamine-O-methyltransferase (COMT) c.472G>A (rs4680, Val 158 Met) single-nucleotide polymorphisms were studied in preterm infants needing intubation and randomized to a premedication strategy including remifentanil (n 17) or morphine (n 17). Methods: Pain was scored with Astrid Lindgren and Lund Children's Hospital Pain Assessment Scale every 30 minutes for 6 hours. The pain relief provided by the opioids was compared between the different KCNJ6 and COMT genotypes. Results: Infants homozygous for the KCNJ6 -1250A allele had an increased duration after intubation to achieve a score indicating no pain compared with infants with the A/G or G/G genotypes (182 ± 30, 109 ± 29, and 60 ± 21 minutes, respectively; Logrank 7.5, P 0.006). Similarly, the duration was increased in individuals with the COMT Val/Val alleles compared with Val/Met and Met/Met (285 ± 37, 137 ± 25, and 63 ± 15 minutes, respectively; Logrank 14.4, P 0.0021). Cox proportional hazards analysis confirmed that the variation in both genes was independently associated with susceptibility to respond to therapy. Conclusion: We conclude that the KCNJ6 -1250A and COMT 158 Val alleles are predisposing preterm newborns to diminished opioid-induced pain relief.
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2.
  • Matic, Maja, et al. (författare)
  • Effect of UGT2B7-900G > A (-842G > A; rs7438135) on morphine glucuronidation in preterm newborns: results from a pilot cohort
  • 2014
  • Ingår i: Pharmacogenomics. - 1462-2416 .- 1744-8042. ; 15:12, s. 1589-1597
  • Tidskriftsartikel (refereegranskat)abstract
    • Aim: Assess association between UGT2B7 polymorphism -900G>A (rs7438135, also known as -842G>A) with morphine kinetics in preterm newborns undergoing mechanical ventilation. Materials & methods: Thirty-four infants were enrolled in a randomized clinical trial and allocated to rapid sequence intubation with remifentanil (1 mu g/kg) or morphine (0.3 mg/kg). The latter group was included in our study. Results: Morphine plasma concentrations at 20 min post intubation were associated with postnatal age (p = 0.017) and UGT2B7 -900G>A (p = 0.036). UGT2B7 -900A allele carriers (n = 13) had lower morphine levels compared with UGT2B7 -900G/G patients (n = 2). Morphine-3-glucuronide and morphine-6-glucuronide plasma concentrations were only found to be associated with gestational and postnatal age. However, -900A allele carriers had a higher morphine-3-glucuronide: morphine metabolic ratio compared with patients genotyped as -900G/G (p = 0.005), as determined by linear regression. Conclusion: Our small pilot study illustrates that in addition to gestational and postnatal age, the UGT2B7 -900G>A polymorphism significantly alters morphine pharmacokinetics in preterm infants.
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