Daily PubMed evidence board
Analgesic effect of premixed nitrous oxide in postoperative rehabilitation for ankle fractures: a randomized controlled trial.
This randomized trial compared inhaled premixed 65% nitrous oxide versus oxygen given during rehabilitation sessions after ankle fracture surgery. Among 1…
Signal score58Research triage score
CertaintyLow-to-moderateVerify in full text
PMID42268729Source identifier
Research triage, not medical advice
Do not use this summary, score, or benefit-cost estimate to diagnose, treat, prescribe, or change care without reviewing the full study and consulting qualified professionals.
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Plain-English signal
This randomized trial compared inhaled premixed 65% nitrous oxide versus oxygen given during rehabilitation sessions after ankle fracture surgery. Among 100 participants who reported moderate or worse acute pain (score ≥4), those randomized to nitrous oxide had substantially lower pain scores during rehabilitation compared with oxygen, and the authors report few and mild adverse reactions. Patients and therapists reported high satisfaction, and residual pain after sessions was lower with nitrous oxide. The authors conclude nitrous oxide is a safe and practical option to reduce pain during postoperative ankle rehabilitation. The full text should be consulted to confirm exact effect sizes, duration of benefit, and safety details.
Why it matters
- Addresses pain management during postoperative rehabilitation after ankle fracture surgery - a common and clinically important problem that can limit participation in rehabilitation and affect recovery.
- Tests an inhaled analgesic (65% nitrous oxide) that could be administered during rehab sessions as a non-oral, short-acting option, potentially reducing need for systemic opioids or oral analgesics.
- If reproducible and implementable, the intervention could change peri-rehabilitation analgesic protocols and staffing/equipment needs in orthopedic and rehabilitation settings.
Primary outcomes
- Pain score (primary outcome reported in abstract)
Effect summary
Abstract reports significantly lower pain scores during rehabilitation in the 65% nitrous oxide group versus 100% oxygen. Secondary outcomes reportedly included anxiety scores, physiological indices, side effects, satisfaction, acceptance, and residual pain; residual pain was reported as significantly reduced with nitrous oxide. Exact numerical effect sizes and p-values require full-text confirmation.
Benefit-cost lens
| Quick take | RCT shows lower pain scores with premixed 65% nitrous oxide vs oxygen during rehab after ankle fracture surgery. Estimating cost-effectiveness requires absolute effect sizes, duration of benefit, per-session costs, and target population size. |
|---|---|
| BCR anchor | 2 |
| Time horizon | 3 |
| Discount rate | 0.03 |
| Assumptions | Assumes abstract-reported results reflect randomized between-group comparisons; economic and implementation effects depend on local price and practice patterns. Full text review needed to confirm effect magnitudes, randomization, blinding, harms, and subgroup results. |
Benefit-cost fields are assumptions-based unless explicitly source-derived. Treat them as prompts for deeper economic review.
Risk of bias
| Tool | rapid-abstract-screen |
|---|---|
| Verdict | Some concerns |
| Notes | Single-center, double-blind RCT with 100 participants reported in abstract. The abstract lacks complete randomized allocation, concealment, attrition, baseline balance, intention-to-treat handling, and full adverse event tables. Statistics in the abstract are partially truncated; full methods and results needed for formal bias assessment. |
Harms, equity, conflicts & implementation
| Implementation | Requires availability of premixed 65% nitrous oxide canisters or delivery system, appropriate scavenging/ventilation, staff training in administration and monitoring, consent and contraindication screening, and protocols for adverse event management. |
|---|---|
| Equity impact | Unclear: equity implications depend on access to gas delivery equipment, trained staff, and monitoring - potential barriers in low-resource settings; subgroup effects not reported in abstract. |
| Harms | Abstract reports few and mild adverse reactions but provides no detailed safety table. Full-text review required to quantify frequency and severity of harms, rare events, or physiologic effects. |
| Registration | ChiCTR2400089379 |
| Replication | Unknown from abstract; single RCT reported, no replication cited. |
Source links — verify original
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