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Methadone and Corrected QT Prolongation in Pain and Palliative Care Patients: A Case-Control Study. | LitMetric

Methadone and Corrected QT Prolongation in Pain and Palliative Care Patients: A Case-Control Study.

J Palliat Med

1 Department of Pharmacy Practice, Wegmans School of Pharmacy, St. John Fisher College, Rochester, New York.

Published: July 2017

AI Article Synopsis

Article Abstract

Background: Methadone (ME) is commonly used in pain and palliative care (PPC) patients with refractory pain or intolerable opioid adverse effects (AEs). A unique ME AE is its corrected QT (QTc) interval prolongation risk, but most evidence exists in methadone maintenance therapy patients.

Objective: Our goal was to identify QTc interval prolongation risk factors in PPC patients receiving ME and other medications known to prolong the QTc interval and develop a risk stratification tool.

Design: We performed a case-control study of adult inpatients receiving ME for pain management. Settings/Subjects: Adult inpatients receiving ME with a QTc >470 msec (males) and >480 msec (females) were matched 1:2 according to age, history of QTc prolongation, and gender with ME patients who did not have a prolonged QTc interval. QTc prolongation risk factors were collected for both groups. Covariates were analyzed using conditional logistic regression. Classification and regression tree analysis was used to identify the ME dose associated with QTc prolongation.

Results: Predictors of QTc prolongation included congestive heart failure (CHF) (OR: 11.9; 95% CI: 3.7-38.2; p < 0.00), peptic ulcer disease (PUD) (odds ratio [OR]: 8.3; 95% confidence interval [95% CI]: 2.4-28.9; p < 0.00), hypokalemia (OR: 6.5; 95% CI: 1.5-28.2; p < 0.01), rheumatologic diseases (OR: 4.7; 95% CI: 1.6-13.9; p < 0.00), taking medications with a known torsades de pointes (TdP) risk (OR: 4.4; 95% CI: 1.8-10.7; p < 0.01), malignancy (OR: 3.3; 95% CI: 1.2-9.3; p < 0.03), hypocalcemia (OR: 2.1; 95% CI: 0.9-4.8; p < 0.07), and ME doses >45 mg per day (OR: 1.9; 95% CI: 0.8-4.8; p < 0.16). Mild liver disease was protective against QTc prolongation (OR: 0.05; 95% CI: 0.0-0.46; p < 0.01).

Conclusions: Predictors of QTc prolongation in our multivariate conditional logistic regression model included CHF, PUD, hypokalemia, rheumatologic disorders, use of medications with a known TdP risk, malignancy, hypocalcemia, and ME doses >45 mg per day.

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http://dx.doi.org/10.1089/jpm.2016.0411DOI Listing

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