Adjuvant Analgesic Use in the Critically Ill: A Systematic Review and Meta-Analysis

Area of Science:

• Critical Care Medicine
• Pharmacology
• Pain Management

Background:

• Opioid analgesics are standard for pain management in intensive care units (ICUs).
• However, prolonged opioid use is associated with adverse effects and dependence.
• Nonopioid adjunctive analgesics present a potential strategy to mitigate opioid-related risks.

Purpose of the Study:

• To systematically review and meta-analyze the efficacy and safety of nonopioid adjunctive analgesics in ICU patients.
• To compare regimens of opioid plus adjuvant versus opioid alone.
• To evaluate the impact on pain scores and opioid consumption.

Main Methods:

• Systematic literature search of major databases (PubMed, Embase, Cochrane Library, CINAHL Plus, Web of Science).
• Inclusion of randomized controlled trials (RCTs) comparing adjuvant-plus-opioid to opioid-alone regimens in adult ICU patients.
• Duplicate screening and data abstraction by independent reviewers.

Main Results:

• 34 eligible RCTs involving various nonopioid adjuncts (e.g., acetaminophen, NSAIDs, ketamine, dexmedetomidine) were analyzed.
• Adjuncts combined with opioids significantly reduced patient-reported pain scores at 24 hours and decreased overall opioid consumption.
• Specific agents like carbamazepine, nefopam, and tramadol demonstrated notable reductions in opioid requirements.

Conclusions:

• Nonopioid adjunctive analgesics are effective in reducing pain and opioid use in critically ill patients.
• Clinicians should consider incorporating these agents to optimize pain management and limit opioid exposure.
• Further research may refine optimal selection and dosing strategies for these adjuncts in the ICU setting.