EFFECT OF KIDNEY TRANSPLANTATION ON INDICES OF CARDIORESPIRATORY FITNESS ASSESSED WITH CARDIOPULMONARY EXERCISE TESTING: A SYSTEMATIC REVIEW AND META-ANALYSIS
Bibliographic record
Abstract
Objective: Patients with kidney failure often present with reduced functional cardiovascular reserve and exercise intolerance. Kidney transplantation is the optimal treatment for patients with end-stage kidney disease as it is associated with longer survival and improved quality of life compared to hemodialysis or peritoneal dialysis. Design and method: This is a systematic review and meta-analysis of studies using cardiopulmonary-exercise-testing (CPET) to examine the cardiorespiratory fitness of patients with kidney failure before and after kidney transplantation. The primary outcome was differences in pre- and post-transplantation values of peak oxygen uptake (VO2peak). Literature search involved PubMed, Web of Science and Scopus databases, manual search of article references and grey literature. Quality assessment was undertaken with Newcastle-Ottawa-Scale. Results: From 379 literature records initially retrieved, 6 studies (207 participants) were included in final meta-analysis. A marginal, but not significant, improvement was observed in oxygen consumption during peak exercise compared to pre-transplantation values (standardized mean difference [SMD]: 0.32, 95%CI -0.02; 0.67). Oxygen consumption at anaerobic threshold (VO2AT) was significantly improved after kidney transplantation (weighted MD [WMD]: 2.30 ml/kg/min, 95%CI 0.50; 4.09), whereas no significant changes were observed in maximum heart rate (WMD: 10.45 bpm, 95%CI -3.97; 24.86). In subgroup analysis, consistent results were shown between patients having undergone transplantation preemptively and those after dialysis initiation (p-value for subgroup differences = 0.95). Of note, a trend for improvement in VO2peak was observed when pooling data reported from follow-up assessments undertaken at least 3 months post-transplantation surgery (SMD: 0.17, 95%CI -0.03; 0.38), but not earlier (WMD: -0.03 ml/kg/min, 95%CI -4.28; 4.23). Conclusions: Several major indices of cardiorespiratory fitness tend to improve after kidney transplantation compared to pre-transplantation values. This finding may represent another modifiable factor contributing to better survival rates of kidney transplant recipients compared to patients undergoing dialysis.
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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 | 0.009 | 0.023 |
| Meta-epidemiology (narrow) | 0.003 | 0.001 |
| Meta-epidemiology (broad) | 0.020 | 0.035 |
| Bibliometrics | 0.005 | 0.006 |
| Science and technology studies | 0.001 | 0.001 |
| Scholarly communication | 0.003 | 0.001 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.002 | 0.002 |
| Insufficient payload (model declined to judge) | 0.003 | 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".