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08:05
Electrophysiological Methods to Assess Peripheral Pain Block in an Anesthetized Rat
Published on: November 21, 2025
Review article: Preventive analgesia: quo vadimus?
Joel Katz1, Hance Clarke, Ze'ev Seltzer
1Department of Psychology, York University, and Department of Anesthesia and Pain Management, Toronto General Hospital, BSB 232, 4700 Keele St., Toronto, ON, Canada M3J 1P3. jkatz@yorku.ca
Anesthesia and Analgesia
|October 4, 2011
Summary
Preventive analgesia aims to reduce postoperative pain by blocking noxious stimuli before, during, and after surgery. This approach, distinct from preemptive analgesia, focuses on preventing sensitization to minimize long-term pain and analgesic needs.
Area of Science:
- Anesthesiology
- Pain Management
- Surgical Research
Background:
- The classic definition of preemptive analgesia involves comparing pre- vs. post-incision drug administration.
- This definition is limited as it overlooks sensitization from various perioperative stimuli.
Observation:
- A broader concept, preventive analgesia, targets noxious stimuli throughout the perioperative period.
- It aims to attenuate peripheral and central sensitization, which exacerbate postoperative pain.
Findings:
- Preventive analgesia is confirmed when pain/analgesic use reduction extends beyond the drug's known duration (5.5 half-lives).
- This distinguishes true preventive effects from direct drug action.
Implications:
- Preventive analgesia offers a more comprehensive strategy for managing acute and chronic postoperative pain.
- Future research should focus on clinical trial designs differentiating preventive from preemptive strategies.
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