Two days of postoperative intravenous antibiotics,
does it really help with Noninferiority to five days for 90-day infection or death after surgery for complex appendicitis?
research showsThe grade is B with 76 points. Infection or death by 90 days occurred in 51/502 (10.2%) versus 41/503 (8.2%); the adjusted absolute difference was 2.0 percentage points (95% CI -1.6 to 5.6), whose upper bound was within the prespecified 7.5% margin. This supports de-escalation after source control, not harm from five-day treatment.
ads claimComplex appendicitis meant intraoperative necrosis, perforation, or abscess with source control. Antibiotic choice, immune status, open surgery, and postoperative course still determine individual duration.
Useful facts when choosing a product
- Antibiotic adverse effects occurred in 45/502 (9%) versus 112/503 (22%).
- Readmission occurred in 58/502 (12%) versus 29/503 (6%).
- Mean total hospital stay was 4.4 versus 6.1 days.
What the research actually shows
Fifteen Dutch hospitals randomized 1,066 patients aged at least eight within 24 hours after surgery through central web-based computerized blocks; 1,005 (502/503) remained in the stated ITT after 61 recruitment or consent errors. Limitation 1: noninferiority design. Listed item: noninferiority design. Avoidability: impossible - antibiotic de-escalation asks whether a shorter course remains within an acceptable margin. Limitation 2: active control only. Listed item: active control only. Avoidability: impossible - no antibiotic would withdraw standard care after complex appendicitis, while placebo IV therapy and extra hospitalization would impose avoidable infection and hospital risks. Under precedent 40, this is not counted as an additional defect. The trial was open, but CDC-defined infection and death are not unblinded subjective endpoints. Exclusion was 61/1066 (5.7%), below substantial attrition (>=15%), and 90 days was the prespecified event window rather than a short-duration defect. ZonMw publicly funded the trial and authors reported no conflicts.
Why this is classified as B (76)
A hard 90-day infection-or-death endpoint, public independence, a met 7.5% margin, and a large RCT are balanced against the noninferiority-design limitation, giving B with 76 points.
Counterpoint. Verdict 1434 is B with 75 points. It asks surgery versus antibiotics for uncomplicated appendicitis; this verdict asks antibiotic duration after surgery for complex appendicitis. They are different questions.
Rejudgment record. New verdict — Hard 90-day events, public funding, met 7.5% margin, and large open noninferiority design
| Endpoint | H | Hard endpoint - actual events such as death |
| Replication | R1 | Single confirmatory trial |
| Independence | I2 | Decisive evidence is publicly or non-profit funded |
| Effect size | E+ | Meets the clinically important threshold |
The scoring table and the verdict agree (B).
Sub-claim grades by effect
This ingredient is marketed for several effects. A single overall grade blends strong and weak claims together, so each effect is graded separately here. The overall grade reflects the strongest disconfirming or core claim.
| Effect (sub-claim) | Grade | Basis |
|---|---|---|
| Noninferiority for 90-day infection or death | B | The 5.6% upper bound was within the 7.5% margin. |
| Antibiotic harms and readmission | B | Adverse effects decreased while readmission increased. |
Cross-check — Codex and Claude
Evidence Table
| Study | Design | Sample | Funding | Endpoint | Result | Weight |
|---|---|---|---|---|---|---|
| Study 1 | Open multicenter noninferiority randomized trial in 15 Dutch hospitals | 503 | Netherlands Organization for Health Research and Development, ZonMw 848015008 | Composite of intra-abdominal abscess, surgical-site infection, or death within 90 days after appendectomy | 10.2% vs 8.2%; adjusted absolute difference 2.0 points (95% CI -1.6 to 5.6); margin 7.5% | Pivotal large hard-endpoint noninferiority RCT |
Receipt — 2 References
All 2 cited sources were verified for existence at the original page (as of 2026-08-18).
Reviewed and approved: Chamgap Editorial Team · Approval date: 2026-08-18 · Corrections: none
Cite this verdict
[Chamgap] Two Days of Postoperative Intravenous Antibiotics Is Noninferior to Five Days for 90-Day Infection or Death After Complex Appendicitis — Benefit — Evidence Grade B·76. 2 cited sources checked. Source: https://chamgap.com/en/verdicts/gut/two-vs-five-days-iv-antibiotics-complex-appendicitis/ · CC BY 4.0CC BY 4.0 — free to use with attribution; do not distort grades, numbers, or verdict meaning.
What this document does and does not do
Chamgap is an information source. It reports what research has and has not confirmed; it does not tell readers what to take or buy. That decision belongs to readers and, when needed, medical or legal professionals. This verdict reflects literature available up to the search date and may change as new research appears. Nothing here is medical advice.