Observational studyKorean journal of anesthesiology2025
Association between preoperative anemia and postoperative delirium in elderly patients undergoing non-cardiac surgery: a retrospective observational study.
Observational study in Korean journal of anesthesiology, 2025. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 4 papers.
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.
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.
Who cites it
4 citing papers in PubMed.
- Association Between Preoperative Activities of Daily Living and Postoperative Delirium in Elderly Patients Undergoing Non-Cardiac Surgery: A Prospective Cohort Study.Clinical interventions in aging · 2026Article
- Article
- Association between preoperative anemia and postoperative delirium in elderly patients undergoing total hip arthroplasty with combined spinal-epidural anesthesia: A retrospective cohort study.Journal of anesthesia and translational medicine · 2025Article
- Preoperative hemoglobin level and its relationship with mortality and adverse outcomes in older hip fracture patients from Qatar.BMC geriatrics · 2025Observational
Corrections and comments
PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.
Authors and funding
5 authors.
Funding
No grant is acknowledged in the PubMed record.
Abstract
backgroundThe association between preoperative anemia and postoperative delirium (POD) is unclear. We sought to evaluate the effect of preoperative anemia on the risk of POD in elderly patients after non-cardiac surgery.
methodsWe retrospectively analyzed 62 600 patients aged over 60 years undergoing non-cardiac surgery between January 2011 and June 2019. The patients were divided into two groups according to the presence of preoperative anemia defined as hemoglobin < 13 g/dl for men and < 12 g/dl for women. Anemia was further categorized into mild or moderate-to-severe anemia based on a cutoff of 11 g/dl. The primary outcome was POD within 7 days after surgery. The secondary outcomes included one- and three-year mortality after surgery. The inverse probability of treatment weighting (IPTW) method was used to adjust for confounders between the two groups.
resultsThe overall incidence of POD was 3.9% (2447/62 600) within 7 days after surgery. After IPTW, preoperative anemia was significantly associated with increased risk of POD (odds ratio [OR]: 1.42, 95% CI [1.30-1.55], P < 0.001). Also, the risk of POD increased with the severity of anemia (OR: 1.32, 95% CI [1.18-1.47], P < 0.001 for mild anemia; and OR: 1.70, 95% CI [1.50-1.93], P < 0.001 for moderate-to-severe anemia). This association was similar for one- and three-year mortality.
conclusionsPreoperative anemia was associated with an increased risk of POD in elderly patients after non-cardiac surgery. Further investigations are required to verify whether preoperative anemia is a modifiable risk factor for POD.
Indexed as
Identifiers
What OpenQuestion holds
Registered trials
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.