Purpose: This study aimed to evaluate the effect of continuous patient education on pain control in outpatients based on changes in pain intensity scores and occurrence of opioid-related adverse effects. Methods: The education intervention was conducted in the following phases; 1) interview at the first visit for opioid introduction, 2) telephone follow-up at home 3 to 7 days after introducing opioid analgesics, and 3) interview at the next visit. Pain intensity scores; frequency of rescue dose; and occurrence of adverse opioid-related effects such as constipation, nausea, and drowsiness were compared among the three intervention phases. Results: When comparing data at phase 2 and 3 with those at phase 1, daily maximum pain score decreased significantly, frequency of rescue dose and opioid dosage increased significantly, and occurrence rates of constipation decreased. Conclusion: Continuous patient education by pharmacist intervention based on not only patient visit interviews but also telephone communication on non-visiting days can improve the pain intensity scores and reduce the rate of opioid-related adverse effects for cancer outpatients.

This study aimed to estimate the cost-effectiveness of pregabalin treatment for neuropathic pain.
Design:Long-term simulations based on state transition models.
Methods:We examined the cost-effectiveness of pregabalin for treatment of three common peripheral neuropathic pains, postherpetic neuralgia(PHN), painful diabetic peripheral neuropathy(DPN), and radiculopathy, using the incremental cost-effectiveness ratio(ICER). We used quality-adjusted life years(QALYs)as an index of effectiveness, and also estimated medical costs. For PHN and DPN, we constructed state transition models comprising two states, with and without pregabalin treatment, and performed 52-week simulations. The pain scores reported in Japanese phaseIII studies were used to set patients' weekly pain scores. The results of utility surveys conducted overseas were used as utility scores, while values randomly sampled from probability distributions were used to set weekly pain scores and drop-out rates. In base-case analyses, we performed 1000 1st-order Monte Carlo simulations using 1000 values randomly sampled from probability distributions, and calculated QALYs and medical costs for 52 weeks for each group. For radiculopathy, the ICER was calculated from changes in QALYs for 12 weeks reported overseas and medical costs estimated separately for the identical period.
Results:The ICERs for PHN, DPN, and radiculopathy were 1,116,886 Yen/QALY, 1,100,420 Yen/QALY, and 1,095,943 Yen/QALY, respectively, which were well below the upper limits of ICER ranges for treatments considered cost-effective. There were no cases in which ICERs obtained from scenario and sensitivity analyses differed significantly.
Conclusion:Pregabalin was shown to be cost-effective treatment for neuropathic pain.

Current evidence for the usefulness of prophylactic antiemetic drugs in opioid-induced nausea and vomiting (OINV) in cancer patients receiving opioid analgesics is limited. Further, antiemetic prophylaxis is not considered necessary in the Guideline for Cancer Pain Management by the Japanese Society of Palliative Medicine. However, prevention of side effects such as OINV is important when opioid analgesics are administered for adequate pain management and to maintain adherence. Cancer patients expect us to study factors affecting OINV and effective prophylactic measures for the condition. We retrospectively analyzed electronic records in our hospital. We found that female sex and the use of prophylactic antiemetics, chemotherapeutic agents, and steroids were statistically significant factors associated with opioid-induced nausea, and that female sex and radiation therapy were significant factors associated with opioid-induced vomiting. Especially in females, the frequency of nausea was significantly reduced in the group that received chemotherapy with antiemetics on the same day of receiving opioid analgesics, compared to the groups that did not receive chemotherapy, or that did not receive antiemetics but received chemotherapy. These results suggest that, especially in females, administering chemotherapy along with antiemetics on the same day may be one possible prophylactic measure for OINV.