Tokyo, Sept. 12 -- UMIN Clinical Trials Registry (UMIN-CTR) received information related to the study (UMIN000062885) titled 'Postoperative pain management and associated factors in patients with preoperative opioid use: a retrospective cohort study' on Sept. 11.

Study Type: Observational

Primary Sponsor: Institute - Keio University School of Medicine

Condition: Condition - chronic pain, cancer pain Classification by malignancy - Malignancy Genomic information - NO

Objective: Narrative objectives1 - Postoperative pain management in chronic opioid users is challenging due to the narrow therapeutic window caused by opioid tolerance, opioid-induced hyperalgesia, and withdrawal risks. Although we implemented a protocol based on our previou...