Student or educator? Sign up with your school email and get 6 months of Pro free.
Cited by 958

The DOI matches its Crossref record; 9 of the 9 references it cites were found in a registry or an index.

The International Cooperative Study on the Timing of Aneurysm Surgery: Part 2: Surgical results

Kassell, Neal F., Torner, James C., Jane, John A., Haley, E. Clarke, Adams, Harold P., _, _·1990·Journal of Neurosurgery

Abstract

✓ A prospective, observational clinical trial was conducted by the International Cooperative Study on the Timing of Aneurysm Surgery to determine the best time in relation to the hemorrhage for surgical treatment of ruptured intracranial aneurysms. Sixty-eight centers contributed 3521 patients in a 2½-year period beginning in December, 1980. Analysis by a prespecified “planned” surgery interval demonstrated that there was no difference in early (0 to 3 days after the bleed) or late surgery (11 to 14 days). Outcome was worse if surgery was performed in the 7 to 10-day post-bleed interval. Surgical results were better for patients operated on after 10 days. Patients alert on admission fared best; however, alert patients had a mortality rate of 10% to 12% when undergoing surgery prior to Day 11 compared with 3% to 5% when surgery was performed after Day 10. Patients drowsy on admission had a 21% to 25% mortality rate when operated on up to Day 11 and 7% to 10% with surgery thereafter. Overall, early surgery was neither more hazardous nor beneficial than delayed surgery. The postoperative risk following early surgery is equivalent to the risk of rebleeding and vasospasm in patients waiting for delayed surgery.

Overview

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Integrity signals

Registry

Crossref · 10.3171/jns.1990.73.1.0037

Cites

9 of 9 references verified0 citation errors · 0 not checkable

Statistics

Verification

Claims the paper makes

The claims and statistics of this paper haven’t been checked yet.

Run the check — free, no account needed. It reads the open-access text and checks the sources it cites.

A few free checks a day · papers already verified open instantly · results are public

Self-check

Percentages, sums and reported differences re-computed from the paper’s own numbers.

The self-check needs the paper’s full text.

Citations

Cites

Show all 9 references

Cited by

See all 958

Metadata

Authors
Kassell, N. F., Torner, J. C., Jane, J. A., Haley, E. C., Adams, H. P., & _, _.
Venue
Journal of Neurosurgery
Published
1990-07
Volume
73
Issue
1
Pages
37-47
ISSN
0022-3085 (ISSN-L)
OpenAlex
W2729107688
Cited by
958
References
9
FWCI
18.11
Type
journal article
Language
en
Open access
closed

About these checks

Registry, retraction, Cites and statistics results are computed, not judged, with one exception: a printed reference that no index lists is read once by a model before it counts as a citation error. Claims are extracted by a model and kept only when their quote appears verbatim in the text; each cited source is then checked, with a model’s help, for whether it says what the claim relies on. Those verdicts can be wrong — read the claim’s quote and the cited source before relying on one.

Statistics and arithmetic are recomputed, not judged.

Confidence bands are shown only for fields calibrated on our annotated test set. None is calibrated yet, so no band is shown.

What counts as a claim ›How we measure confidence ›How we check this ›

Are you an author, or do you see a problem with this page? Request a review

How to cite

Cite CoChat for the checks on this page, and the paper for its own findings.

This page
CoChat. (2026). Citation check: The International Cooperative Study on the Timing of Aneurysm Surgery: Part 2: Surgical results. https://app.cochat.ai/papers/10.3171/jns.1990.73.1.0037
The paper
Kassell, N. F., Torner, J. C., Jane, J. A., Haley, E. C., Adams, H. P., & _, _. (1990). The International Cooperative Study on the Timing of Aneurysm Surgery: Part 2: Surgical results. Journal of Neurosurgery. https://doi.org/10.3171/jns.1990.73.1.0037

Data sources

Bibliographic data: Semantic Scholar, OpenAlex, Crossref.

Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).

Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.