A Systematic Review Of The Role Of Erythropoietin In The Pathophysiology Of Anemia In Elderly Patients
Bibliographic record
Abstract
Abstract Introduction Anemia is a significant issue in the geriatric population, having an impact on morbidity, mortality and quality of life. However, identifying the etiology of anemia is not possible in ∼30% of patients. Postulated mechanisms of anemia of unknown etiology (AUE) include a blunted response to erythropoietin (EPO) or inadequate EPO production in response to anemia. The latter mechanism is of particular interest since it might be amenable to pharmacological intervention. Therefore, in order to explore the relationship between EPO levels and hemoglobin in elderly individuals with AUE, we conducted a systematic review of observational studies. Methods We searched Medline, EMBASE, Web of Science, Biosis Previews and Dissertations and Theses using the terms erythropoietin, anemia, elderly and diagnosis as MeSH subject headings. Additional relevant articles were identified by hand searching the meeting abstracts of the European Hematology Association (2006 - 2012) and the American Society of Hematology (2004 - 2012). For inclusion into the final review, studies needed to report data on EPO levels in elderly individuals diagnosed with anemia of unknown etiology. No meta-analysis was conducted due to the heterogeneity of the retrieved studies. Results The search identified 4277 potentially relevant citations, of which 31 studies were reviewed in full and 7 cohort studies (2 retrospective, 5 prospective) were included in the final review. The included studies involved 2534 participants ( 1). In general, studies found: 1) lower EPO levels in AUE compared to iron deficiency anemia and other forms of anemia; 2) a lack of correlation between EPO levels and the severity of anemia; and 3) EPO levels in AUE that are in general higher than in non-anemic patients. Conclusion Our findings suggest that EPO levels are generally elevated in elderly individuals with AUE, but remain inappropriately low, particularly when compared to anemia of other etiologies suggesting either a relative EPO deficiency, an abnormal EPO response or an abnormal erythroid cell response to EPO. Further research is required to elucidate the mechanisms involved, and the value of pharmacological interventions. Disclosures: No relevant conflicts of interest to declare.
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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 | 0.007 | 0.026 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.008 | 0.006 |
| Bibliometrics | 0.010 | 0.010 |
| Science and technology studies | 0.000 | 0.001 |
| Scholarly communication | 0.002 | 0.002 |
| Open science | 0.002 | 0.001 |
| Research integrity | 0.001 | 0.001 |
| Insufficient payload (model declined to judge) | 0.004 | 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".