#35920 The association between preoperative frailty and hypotension during the beach-chair position in patients undergoing total shoulder arthroplasty under general anesthesia with interscalene brachial plexus block
Bibliographic record
Abstract
Please confirm that an ethics committee approval has been applied for or granted: Yes: I’m uploading the Ethics Committee Approval as a PDF file with this abstract submission Application for ESRA Abstract Prizes: I apply as an Anesthesiologist (Aged 35 years old or less) Background and Aims The beach-chair position (BCP) is commonly used for shoulder surgery but is known to increase hypotension incidence. Older age and interscalene brachial plexus block (ISB) have also been identified as risk factors for hypotension during BCP. As altered blood pressure control mechanisms and autonomic dysfunction, which cause hypotension, are more likely to occur in frail older patients, we investigated the association between preoperative frailty and hypotension during BCP in older patients. Methods Patients aged ≥ 65 years who underwent elective total shoulder arthroplasty in BCP under general anesthesia with preoperative ISB were included. The frailty of participants was assessed before surgery using the Reported Edmonton Frail Scale. Quadriceps depth was measured by ultrasound preoperatively, and values < 2.3cm were considered significant. Hypotension was defined as a mean blood pressure < 65mmHg or a decrease of ≥ 20% from baseline. Results Data were analyzed from 46 patients (mean age: 72.8 yrs). The incidence of hypotension during BCP was 71.7% (non-frail/prefrail/frail; 70.3%, 80% and 100%). A decreased quadriceps depth < 2.3cm was an independent risk factor for hypotension during BCP (odds ratio, 8.49, 95% confidence interval [CI], 1.38 – 51.90). The predictive power of hypotension during BCP was higher when both frailty and quadriceps depth were considered together, compared to considering frailty alone (AUC [95% CI], 0.766 [0.60-0.89] vs 0.51 [0.35-068], p=0.01). Conclusions A reduced quadriceps depth is associated with hypotension during BCP. Assessing both frailty and quadriceps depth may enhance the screening tool for identifying older patients at risk of developing hypotension during BCP. Attachment CRIS.pdf
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How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.002 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.001 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.007 | 0.001 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".