Opioid Use amongst Cancer Patients at the End of Life

Abstract

Introduction: Concerns about the life shortening effect of opioids is a well known fact in the medical world when considering administration of these drugs for symptom alleviation at end of life. This study described the patterns of opioid use among cancer patients referred to a hospital-based specialist palliative care service for symptom management. This study also examined whether opioid use among terminally ill cancer patients during the last 2 days of life had any influence on survival. Materials and Methods: A retrospective review of case notes of patients who were diagnosed with terminal cancer and had passed away in a 95-bedded oncology ward between September 2006 and September 2007 was conducted. Data were collected on patients’ characteristics and patterns of opioid use including opioid doses and dose changes at 48 hours and 24 hours before death. Results: There were 238 patients who received specialist palliative care, of whom 132 (55.5%) were females. At 48 hours and 24 hours before death, 184 (77.3%) patients and 187 (78.6%) patients had received opioids, respectively. The median daily doses at 48 hours and 24 hours were 48 mg and 57 mg oral morphine equivalent doses (OME), respectively. Indications for opioid use were pain (41.1%), dyspnoea, (29.1%) and both dyspnoea and pain (30.8%). In the final 24 hours, 22.3% patients had a reduction in their mean opioid dose while 22.7% required an increase in their mean opioid dose. Increased age was associated with decreasing opioid doses (P = 0.003). Patients with spinal metastases required higher doses of opioids (P = 0.03) while those with lung metastases required lower doses (P = 0.011). Survival analysis using Kaplan-Meier survival curve revealed no significant survival difference between those who were on opioids and those who were not. Log rank test (Mantel-Cox) (P = 0.69). Conclusion: Our results showed that opioids are safe medications for symptom alleviation in terminally ill cancer patients during the last days of life and have no deleterious influence on survival. Key words: Palliative care, Survival analysis, Terminal cancer