Application of Intradialytic Magnetic Resonance Imaging and Spectros-copy Demonstrates Hemodialysis-Related Acute Brain Injury
Bibliographic record
Abstract
Background: Hemodialysis (HD) provides lifesaving treatment for patients with end stage kidney disease. However, treatment related hemodynamic stress results in recurrent ischemic injury to vulnerable organs, such as the heart. Short term reduction in brain blood flow and long-term white matter (WM) changes have been reported. However, the basis of HD-induced brain injury is neither well recognized nor understood even though progressive cognitive impairment is common. Methods: 21 patients (age: 63±13 years, male: 58.8%) were recruited. Study procedures included neurocognitive assessments, intradialytic anatomical magnetic resonance imaging (MRI), diffusion tensor imaging (DTI), and magnetic resonance spectroscopy (1H-MRS). Data acquired before HD and during the last 60 minutes of HD (during peak hemodynamic stress) were analyzed to assess the acute impact of HD on the brain. Results: HD resulted in the development of multiple regions of white matter (WM) intradialytic fractional anisotropy (FA) increase with associated mean diffusivity (MD) and radial diffusivity (RD) decreases (Fig. 1a), characteristic features of cytotoxic edema (with increase in global brain volumes, Fig. 1b). Decreases in 1H-MRS measured NAA and choline concentrations during HD were also observed (Fig. 2), indicative of regional ischemia. Severity of WM changes were associated with reduced cognitive function performance, particularly relating to executive functioning (Fig. 1c).Figure 2a,b.: Intradialytic changes in prefrontal NAA and choline (Cho) concentrations are shown in (a) and (b), respectively. Box and whisker plots with whiskers showing minimum and maximum values are plotted. Concentrations of NAA and Cho (mean = standard error) were significantly lower during the last 60 minutes of dialysis (peak hemodynamic stress) versus the start of dialysis (NAA; 13.5 ± 0.5 mM vs. 12.2 ± 0.5 mM, p < 0.05; Cho: 3.70 ± 0.1 mM vs. 4.06 ± 0.1 mM, p < 0.05).Conclusions: This study demonstrates, for the first time, that functionally significant intradialytic changes in brain tissue volume, diffusion metrics, and brain metabolite concentrations consistent with ischemic injury occurs. Preventing HD-induced brain injury requires urgent additional investigation to improve subjective tolerability of treatment and maintenance of independence and cognitive vitality for patients. Funding: Private Foundation Support
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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 | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.001 | 0.000 |
| Bibliometrics | 0.000 | 0.000 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.000 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.000 | 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".