Evaluating the Impact of an Aggressive Strategy to Create Wrist Arterio-Venous Fistula in Patients on Hemodialysis
Bibliographic record
Abstract
OBJECTIVES: To compare two approaches to hemodialysis arterio-venous fistula (AVF) creation, and to evaluate the benefit of expanding wrist-AVF selection criteria. BACKGROUND: The recommendation summarized under the Dialysis Outcome and Quality Initiative (DOQI) suggests the placement of a wrist-AVF as a first choice for patients starting hemodialysis. However, its benign complications contrast with its high early failure rates. In the absence of predictors of a successful access, decision on whether or not to attempt such an access depends on the subjective clinical judgment. METHODS: This is a retrospective study of patients with ESRD disease in Southern Alberta who underwent a vascular access creation during the year 2000. The surgery was performed by 2 surgeons each having his own approach to access selection (approach A and B). Approach A had broader criteria (vessels < 3 mm) for wrist-AVF creation, whereas approach B was more conservative, thus limiting the selection to patients with wrist vessels superior to 3 mm. The type of simultaneous access created in the same limb was dependant of this first choice. A Markov decision tree analysis was used to model yearly transition between patent and failed access. The absence of further possibility of access creation in the same arm was taken as a time horizon. Sensitivity analysis was used to test the effect of maximizing a wrist-AVF on overall arm failure. RESULTS: In approach A there was 69% of wrist AVF creation as the first type of access compared to 31% in approach B. A two-year wrist-AVF patency was 80% in approach B versus 61% in approach A. The expected mean time to complete limb failure was longer in patients treated with approach A (3.62 versus 3.50 years). Sensitivity analysis showed an ultimate benefit for approach A. CONCLUSIONS: Wrist vessel size less than 3 mm should not be a limiting factor for the creation of a wrist-AVF. Maximizing the creation of such an access, despite increasing the rate of early failure, prolongs the option of hemodialysis access in the same arm.
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How this classification was reachedexpand
Full frame distilled prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. Learned from the 10,348 direct Codex labels and 10,348 direct Gemma labels. Candidate is the union of thresholded teacher heads; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels or direct frontier model labels.
Codex and Gemma teacher scores by category
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.004 | 0.001 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.001 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.001 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.000 | 0.000 |
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 teacher head, 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".