Sodium-Induced Microcirculatory Dysfunction During Hemodialysis
Bibliographic record
Abstract
Background: Hemodialysis (HD) results in microcirculatory dysfunction (MD) leading to recurrent cardiac ischemia. Endothelial glycocalyx is vulnerable to circulatory and oncotic stress (predominantly Na+ mediated)- inducing shedding of syndecan-1 (syn1), a transmembrane heparan sulfate proteoglycan. The glycocalyx binds Na+, buffering sudden serum Na+ shifts, and can be damaged with acute changes in Na+ concentration ([Na+]). The aim of this study is to investigate the effects of [Na+] dialysate on endothelial cell injury and MD during HD. We hypothesize that avoidance of higher [Na+] dialysate would have a direct protective effect on the endothelial glyocalyx and minimize directly observed HD-associated microcirculatory disturbance. Methods: 8 healthy male Wistar Kyoto rats underwent HD: 4 were exposed to a higher dialysate [Na+] (140mM) and 4 were exposed to dialysate [Na+] below typical rat plasma Na+ level (hyponatremic-130mM). Throughout HD, intravital microscopy (IVM) was used to image skeletal muscle microvasculature at baseline, during extracorporeal circulation with no dialysate flow (“Sham”), at 1 hr into HD, at 2 hrs into HD, and post HD (“Final”). The IVM images were processed to automatically derive the number of identified intersecting points, to quantify microcirculatory blood flow and observe the change in perfusion index at each timepoint. Blood samples were collected at the same timepoints corresponding to the IVM image acquisitions to measure syn1 and quantify glycocalyx shedding during HD. Continuous BP recordings were made from carotid artery cannulation. Results: BP response to HD was comparable between the two groups. We observed progressive increase in syn1 concentration in blood plasma sampled throughout the duration of the experiment in both groups (Fig 1A). The hyponatremic group demonstrated a consistent trend of lower perfusion index at all timepoints relative to the comparator group (ns, Fig 1B). Conclusions: Preliminary data in healthy rats suggests that a single HD session results in syn1 release from the vasculature- indicating acute HD-associated endothelial injury. Limiting exposure to intradialytic Na+ may reduce MD under the stress of HD, despite equivalent systemic hemodynamic response.
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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 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 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) | 0.001 | 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 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".