Blood Flow and Recirculation Rates in Tunneled Hemodialysis Catheters
Why this work is in the frame
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Bibliographic record
Abstract
Long-term catheters are widely used in some dialysis units. Because of higher dialysis dose targets, high flow catheters have been made available. We measured blood flow (Qb in ml/min) and recirculation rate (R%) in two types of tunneled dialysis catheters using ultrasound-dilution technology (Transonic). Thirty-seven catheters were evaluated (27 Opti-Flow, 10 High-Flow), as inserted in jugular or subclavian veins. Real Qb and R were measured at increasing pump blood flows (250, 300, 350, 400, and 450 ml/min) in absence of ultrafiltration. For all, real Qb was similar to pump Qb (261 vs. 250, 304 vs. 300, 349 vs. 350, 389 vs. 400, and 431 vs. 450 ml/min, respectively). Catheters with reversed lines were all recirculating (R between 18% and 24%). Sixteen nonreversed catheters had no R at all Qb, whereas four nonreversed catheters had minimal R (between 7% and 11%); R did not increase significantly with the rise in pump Qb. The two types of tunneled catheters deliver high Qb without high R if ports are not reversed. The relative decrease in treatment efficiency should be accounted for in dialysis prescription if such tunneled catheters are used as long-term access, especially if lines have to be reversed.
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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 | 0.001 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.001 | 0.000 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 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 it