A better knowledge of opioid prescribing patterns would help to identify areas of potential improvement in cancer pain management. This study aimed to identify potential inappropriate use (PIU) of strong opioid analgesics in cancer outpatients in their last year of life. Methods: A retrospective cohort of cancer patients who died between 2011 and 2014 and were exposed as outpatient to a strong opioid analgesic in the last year of life was identified in the Echantillon Généraliste de Bénéficiaires (a 1/97th random sample of the French general population). Prescribing patterns of strong opioids were analysed and PIU was defined by at least 1 of these criteria: overlapping prescriptions; contraindicated prescriptions; lack of laxatives; potential drug interactions; prescription in patients hospitalized for opioid-related disorders. Factors associated with PIU were investigated through a multiple logistic regression model. Results: One third of the 2236 patients (median age 72 years [interquartile range: 61-82], 44.1% women) presented a PIU (insufficient laxative prescription [19.6% of patients], insufficient background treatment with transmucosal fentanyl [14.8%],overlapping prescriptions [2.6%]). The rate of PIU significantly decreased from 37.6% (2011) to 29.8% (2014). For patients with a duration of opioid use ≥3 months, factors associated with PIU were fentanyl prescription (adjusted odds ratio = 2.36; 95% confidence interval [1.86-3.00]) and previous use of strong opioid (adjusted odds ratio = 1.88; [1.50-2.36]). Conclusion:In France, 1/3 of cancer patients exposed to strong opioids experienced PIU and this proportion tended to decrease over time. There is still room for progress in cancer pain management at the end of life.cancer, end of life, misuse, opioid analgesics, potentially inappropriate prescription | INTRODUCTIONDue to clinical and therapeutic progress, cancer has become a chronic disease most often associated with chronic cancer-related pain of varying intensity, affecting the patients' daily activities and quality of life. Several recommendations assist health professionals in the management of cancer pain with optimal efficiency and no major adverse effects. 1 However, effective cancer pain management in
Aim: A better knowledge of opioid prescribing patterns would help to identify areas of potential improvement in cancer pain management. This study aimed to identify potential inappropriate use (PIU) of strong opioid analgesics in cancer outpatients in their last year of life. Methods: A retrospective cohort of cancer patients dead between 2011 and 2014 and who were exposed as outpatient to a strong opioid analgesic in the last year of life was identified in the “Echantillon Généraliste de Bénéficiaires” (a 1/97th random sample of the French general population). Prescribing patterns of strong opioids were analyzed and PIU was defined by at least one of these criteria: overlapping prescriptions; contraindicated prescriptions; lack of laxatives; potential drug interactions; prescription in patients hospitalized for opioid-related disorders. Factors associated with PIU were investigated through a multiple logistic regression model. Results: One third of the 2,236 patients (median age 72 years (IQR: 61-82), 44.1% of women) presented a PIU (insufficient laxative prescription (19.6% of patients), insufficient background treatment with transmucosal fentanyl (14.8%), overlapping prescriptions (2.6%)). The rate of PIU significantly decreased from 37.6% (2011) to 29.8% (2014). For patients with a duration of opioid use 3 months, factors associated with PIU were fentanyl prescription (aOR=2.36; 95% CI [1.86-3.00]) and previous use of strong opioid (aOR=1.88; [1.50-2.36]) Conclusion: In France, one third of cancer patients exposed to strong opioids experienced PIU and this proportion tended to decrease over time. There is still room for progress in cancer pain management at the end of life.
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