Meta-analysisindependent cross-checkabstract checked★ key study I-BAR-103 in-depth review

How often people die from weight-loss surgery itself

Perioperative mortality in bariatric surgery: meta-analysis.

Overview

Robertson et al.. Br J Surg 2021 · PMID 34297806 · DOI 10.1093/bjs/znab245

About 1 in 2,000 sleeve operations ends in death around the time of surgery.

Does the study support the specific claim? No · Methodological quality: moderate

Study explained simply

What did the researchers want to find out?: Measure early death risk
How was the study done?: Meta-analysis
How many people, animals or samples were studied?: >3.6 million patients
What was actually found?: Overall 0.08%, sleeve 0.05%
How large was the observed effect?: 0.05% for sleeve
What do the results mean in everyday life?: Death from the operation is rare but not zero
What are the study's limitations?: Reporting differences between sources
What does it say about Elawady's specific claim?: Contradicts "lethal" as a general statement
Do the results apply to Germany and Europe?: Mostly Western data
What can explicitly not be concluded from this study?: Long-term mortality

What is perioperative mortality after bariatric surgery, by procedure and data source?

Study design: Meta-analysis – Systematic review and meta-analysis of studies with >=1000 patients (2014-2020)
Population: Patients undergoing bariatric surgery in large studies, registries and RCTs
Country: Multinational
Period: Search 2014-July 2020
Sample size: 58 studies, >3.6 million patients, 4707 deaths
Inclusion and exclusion criteria: Studies of >=1000 patients reporting short-term mortality

Exposure / intervention: Bariatric surgery by type
Comparator: Between procedures and data sources
Endpoints: Perioperative (30-day, 90-day, in-hospital) mortality
Statistical methods: Random-effects meta-analysis of proportions; prediction interval; PROSPERO CRD42019131632

Results: Overall pooled mortality 0.08% (95% CI 0.06-0.10; prediction interval 0-0.21%). By procedure: band 0.03%, sleeve 0.05%, OAGB 0.09%, RYGB 0.09%, duodenal switch 0.41% (P<0.001). No difference by time window (P=0.29) or data source (P=0.60).
Absolute risks: Sleeve: about 0.05% (about 1 death per 2,000 operations) perioperatively.
Authors' conclusion: Bariatric surgery is safe, with low reported perioperative mortality rates.

Crude 4707/3.6M = 0.13% vs pooled 0.08% (study weighting) (stats/I-BAR-103_robertson_2021.py).

Quantifies the real but small risk of dying from the operation itself.

Low-volume or low-resource centres may have higher mortality.

Mostly high-income registries.

High-quality estimate that early death after sleeve is rare (~0.05%).

Multidimensional assessment
Multidimensional assessment
Authenticity of the source	verified
Methodological quality	moderate
Risk of bias	some concerns
Precision of results	high
Directness	direct
Reproducibility	replicated
Consistency with the overall evidence	consistent
Regional transferability	moderate
Adequacy of the interpretation (by the archive)	not applicable

Mortality in low-volume centres and in Egypt.