Frequency, indications, outcomes, and factors associated with successful opioid rotation in cancer patients presenting to an outpatient supportive care center.

Abstract

e19599 Background: Opioids are first line medications for cancer pain. Opioid rotation (OR) is recommended for uncontrolled cancer pain (UCP) and opioid induced neurotoxicity (OIN). Limited data exist on frequency, indications and outcomes of OR in ambulatory cancer patients in outpatient setting. Methods: We reviewed consecutive outpatient visits to the Supportive Care Center in 2008 for OR. Data regarding demographics, Edmonton Symptom Assessment Scale (ESAS), Memorial Delirium Assessment Scale, pain characteristics, opioid use, indication for OR, outcomes, morphine equivalent daily dose (MEDD) and supportive counseling was collected in all patient visits who followed up within 5 weeks of OR. Successful OR was defined as a 2 point or 30% reduction in ESAS symptom score, resolved symptoms of OIN and continuation of new opioid at follow up. Stepwise logistic regression analysis was performed to determine factors associated with successful OR. Results: 244/2471(10%) patient visits had OR and 142 (58%) were followed up within 5 weeks. 40% (57/142) were consult visits. 74% (105/142) were white, 60% (85/142) male. Median age and performance status were 55 and 1. GI (24%) and lung (22%) were the most common cancer types with 77% (110/142) advanced cancer. Median time (Q1-Q3) between OR and follow up was 14 (7-21) days. Most common indications for OR were UCP 82% and OIN 13%. 34% had partial OR and 16% had more than one reason for OR. Pain characteristics were 49% nociceptive, 21% mixed and 11% neuropathic. Median (Q1-Q3) pain and symptom distress score improved: -2 (-4-0, P=.003) and -5 (-14-7, P=.004). Median MEDD (Q1-Q3) decreased from 162 (90-287) to 156 (90-280, P=.82). 66% (94/142) had successful OR. Fentanyl (34%) before and Methadone (55%) after OR were most common opioids. 17% (24/142) had another OR at follow up visit. High MEDD (P=.05) prior to OR was associated with successful OR. Conclusions: 10% of outpatient visits had OR with a 66% success rate in treating UCP and OIN. Further research is needed to determine predictors of successful OR.