Evidence map›Paper›PMID 33515330›Full record

ArticleInternational orthopaedics2021

Retrospective high volume comparative study suggests that patients on aspirin could have immediate surgery for hip fractures without significant blood loss.

Takao Ohmori, Kazukiyo Toda, Tomoko Kanazawa, Keitaro Tada, Yukihisa Yagata, Yasuo Ito

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Article in International orthopaedics, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 9 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
9citing papers in PubMed, 1 pooled it
1.9field-weighted citation impact, top 15% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

9 citing papers in PubMed, 1 synthesis or guideline pooled it, 14 citations in OpenAlex.

  1. Post-operative complications associated with the pre-operative use of Aspirin in patients undergoing surgery for hip or femoral fracture: a meta-analysis.European journal of trauma and emergency surgery : official publication of the European Trauma Society · 2025
    Pooled it
  2. Review
  3. Article
  4. Article
  5. Article
  6. The management of anticoagulated fragility femoral fracture patients.Hip international : the journal of clinical and experimental research on hip pathology and therapy · 2024
    Review
  7. Article
  8. Article
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4 · The record

Corrections and comments

5 · Who and what money

Authors and funding

6 authors at 2 institutions in 1 country.

Takao OhmoriDepartment of Orthopaedic Surgery, Japanese Red Cross Kobe Hospital, Kobe, Japan. takao771577157715@yahoo.co.jp.ORCID 0000-0003-0103-5558
Kazukiyo TodaDepartment of Orthopaedic Surgery, Japanese Red Cross Kobe Hospital, Kobe, Japan.
Tomoko KanazawaDepartment of Orthopaedic Surgery, Japanese Red Cross Kobe Hospital, Kobe, Japan.
Keitaro TadaDepartment of Orthopaedic Surgery, Hyogo Emergency Medical Center, Kobe, Japan.
Yukihisa YagataDepartment of Orthopaedic Surgery, Hyogo Emergency Medical Center, Kobe, Japan.
Yasuo ItoDepartment of Orthopaedic Surgery, Japanese Red Cross Kobe Hospital, Kobe, Japan.
Japanese Red Cross Kobe Hospital · JPKobe Medical Center · JP

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

purposeThis study aimed to investigate the effects of aspirin on peri-operative hidden blood loss during hip fracture surgery by adjusting for possible factors affecting blood loss using a propensity score matching method.

methodsWe retrospectively collected data from a cohort of isolated hip fracture patients (aged ≥ 65 years)who underwent surgery from January 2010 to December 2019. The study's primary outcome was blood loss from admission to the day after surgery in the aspirin and control groups. We estimated the hidden blood loss, calculated based on patient's blood volume, haemoglobin measurements, and blood transfusions. The secondary outcome focused on the requirement for blood transfusion. We adjusted for possible factors affecting blood loss using a propensity score matching method and statistically examined the effects of aspirin on hip fracture surgery.

resultsWe enrolled 806 patients of whom 271 (34%) were taking anticoagulant and antiplatelet drugs, while 114 (14%) were taking only aspirin (aspirin group). A total of 535 patients were not taking antiplatelets and anticoagulants (control group). In propensity score matching, 103 patients were matched. Aspirin was not associated with a significantly higher risk of hidden blood loss (aspirin group; median 598 mL [410-783 mL] vs control group; median 556 ml [321-741 mL], p = 0.14) and higher risk of blood transfusion requirement (aspirin group; 49 patients [48%] vs control group; 39 patients [38%], p = 0.21).

conclusionAspirin did not affect peri-operative blood loss in hip fracture surgery. We concluded that patients taking aspirin can safely undergo hip fracture surgery without delay.

Indexed as

AspirinHip FracturesAgedBlood Loss, SurgicalHumansPlatelet Aggregation InhibitorsRetrospective StudiesAspirinPlatelet Aggregation InhibitorsAspirinBlood lossBlood transfusion requirementHip fracture surgeryPeri-operative

Identifiers

PMID33515330
OpenAlexW3124909041

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Registered trials

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Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.