Prolonged central apnoea after intravenous morphine administration in a 12-year-old male with a UGT1A1 loss-of-function polymorphism.

Abstract:

ADVERSE EVENT:Repeated and prolonged episodes of central apnoea and hypoxia after receiving intravenous morphine for analgesia and ketamine for sedation. DRUG IMPLICATED:Intravenous morphine sulfate. THE PATIENT:Previously healthy 12-year-old male with no history of sleep apnoea who presented with distal tibia and fibula fracture. EVIDENCE THAT LINKS DRUG TO EVENT:Pharmacogenomic testing revealed that the patient was homozygous for the T allele at the rs887829 SNP in UGT1A1, an enzyme involved in the metabolism of morphine. This polymorphism is a loss-of-function variant, leading to impaired metabolism of morphine. MECHANISM:Morphine is metabolized by UDP-glucuronosyltransferase (UGT)-2B7 and UGT1A1 to form its major metabolites morphine-3-glucuronide (M3G) and morphine-6-glucuronide (M6G). Our patient was a poor metabolizer through UGT1A1, likely leading to increased respiratory depression as morphine has greater respiratory depressant effects compared to its metabolites. IMPLICATIONS:When appropriate, physicians should enquire about prior receipt of opioids, in both the patient and family, to be better prepared for potential adverse reactions. In the patient with excessive sedation or respiratory depression to standard doses of morphine, genetic testing may be warranted, especially if there is a family or past history that supports a metabolic defect in morphine metabolism and/or excretion.

journal_name

Br J Clin Pharmacol

authors

Toce MS,Kim H,Chung S,Krauss BS

doi

10.1111/bcp.13779

subject

Has Abstract

pub_date

2019-01-01 00:00:00

pages

258-262

issue

1

eissn

0306-5251

issn

1365-2125

journal_volume

85

pub_type

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