Regarding Patient-Controlled Analgesia (PCA), all of the following statements are correct EXCEPT:

Explanation

## Identifying the Incorrect Statement **Key Point:** In Patient-Controlled Analgesia, opioid-naive patients require LOWER bolus doses than opioid-tolerant patients, not higher. This is a fundamental principle of opioid dosing. ## Why the Correct Answer is Wrong Opioid-naive patients have no tolerance and are at high risk of adverse effects (respiratory depression, oversedation) with standard or high doses. Therefore: - **Opioid-naive patients:** Start with lower bolus doses (e.g., 1–2 mg morphine IV or equivalent) - **Opioid-tolerant patients:** Require higher bolus doses due to cross-tolerance Reversing this principle would lead to dangerous overdosing in opioid-naive patients. ## Correct Statements Explained | Feature | Details | |---------|----------| | **Patient autonomy** | PCA empowers patients to self-administer within safety limits, reducing anxiety and improving satisfaction | | **Lockout interval** | Typically 5–15 minutes; prevents accidental overdosing by blocking bolus requests during refractory period | | **Background infusion** | Used in opioid-tolerant patients; increases efficacy but requires careful titration to avoid respiratory depression | **High-Yield:** The lockout interval is the single most important safety feature in PCA design—it is non-overridable and prevents cumulative toxicity regardless of patient demand. **Clinical Pearl:** A common exam trap is confusing opioid-naive dosing with opioid-tolerant dosing. Always remember: tolerance → higher dose requirement; naivety → lower dose requirement.