CASE 2
Ms. M, age 39, is G4P2 and presents to the hospital during her fifth pregnancy at 27 weeks gestation. She has not received prenatal care for this pregnancy. She has a history of OUD and major depressive disorder (MDD). Ms. M’s urine toxicology is positive for opiates, fentanyl, and oxycodone. Her laboratory results are notable for mildly elevated alanine aminotransferase, positive hepatitis C antibody, and a hepatitis C viral load of 91,000, consistent with chronic hepatitis C infection. On admission, her COWS score is 14, indicating moderate withdrawal symptoms. Her ECG is unremarkable, and fetal monitoring is reassuring.
Ms. M had received methadone during a prior pregnancy and opts to reinitiate treatment with methadone during her current admission. The team initiates methadone 20 mg/d with additional as-needed doses for ongoing withdrawal symptoms. Due to a persistently elevated COWS score, Ms. M’s methadone is increased to 90 mg/d, which resolves her withdrawal symptoms. However, on Day 4, Ms. M reports having anxiety, refuses bloodwork to obtain methadone peak and trough levels, and prematurely discharges from the hospital.
One day later at 27 weeks, 5 days gestation, Ms. M is readmitted for continued management of opioid withdrawal. She presents with stable vital signs, an unremarkable ECG, and reassuring fetal monitoring. Her COWS score is 5. The treatment team reinitiates methadone at 80 mg/d and titrates it to 100 mg/d on Day 7. Given Ms. M’s ongoing evening cravings and concern for rapid methadone metabolism, on Day 10 the team switches the methadone dosing to 50 mg twice daily to maintain steady-state levels and promote patient comfort. Fluoxetine 20 mg/d is started for comorbid MDD and eventually increased to 80 mg/d. Ms. M is discharged on Day 15 with a regimen of methadone 60 mg/d in the morning and 70 mg/d at night. She plans to resume care in an opioid treatment program and follow up with psychiatry and hepatology for her anxiety and hepatitis C.
A need for aggressive treatment
Given the rising rates of opioid use by patients who are pregnant, harmful behavior related to opioid use, and a wealth of evidence supporting opioid agonist treatment for OUD in pregnancy, there is a growing need for guidance in managing perinatal OUD. A systematic approach to using methadone to treat OUD in patients who are pregnant is essential; the lack of data surrounding use of this medication in such patients may cause overall harm.12 Limited guidelines and a lack of familiarity with prescribing methadone to patients who are pregnant may lead clinicians to underdose patients, which can result in ongoing withdrawal, premature patient-directed discharges, and poor engagement in care.13 Both patients in the 2 cases described in this article experienced ongoing withdrawal symptoms despite daily titration of methadone. This suggests rapid metabolism, which was successfully managed by dividing the dosing of methadone, particularly in the latter trimesters.
These cases illustrate the need for aggressive perinatal opioid withdrawal management through rapid escalation of divided doses of methadone in a monitored acute care setting. Because methadone elimination is more rapid and clearance rates increase during the perinatal period, divided methadone dosing allows for sustained plasma methadone concentrations and improved outpatient treatment adherence.9,14,15
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