Acute Hemolytic Reactions Reported in ITP Patients Treated with Rho (D) Immune Globulin: Symptom Onset and Does Prior Exposure Lessen the Risk?
Bibliographic record
Abstract
Abstract Abstract 4670 BACKGROUND: Acute hemolytic reactions (AHR) associated with administration of Rho (D) Immune Globulin (RhIG; WinRho® SDF, Cangene Corporation, Winnipeg, Canada) have been infrequently reported during the previous 16 years. AHR were defined as any case reported with signs of hemolysis (hemoglobin decrease, haptoglobin decrease, LDH increase, elevation of bilirubin, etc.) occurring within hours to a number of days after RhIG administration irrespective of the degree of change from baseline. Intravascular hemolysis (IVH) was defined as a specific type of AHR in which plasma or urinary hemoglobin were positive. The reporting rate of AHR (including IVH) among RhIG-treated patients was previously estimated as 1/946 doses (0.11%), while the estimated reporting rate of IVH was 1/3,271 doses (0.03%).1 Reports surrounding the clinical monitoring of such patients have led to the analysis of AHR post-marketing data. AIMS/PURPOSE: Identify the onset of AHR/IVH symptoms relative to RhIG and determine if prior exposure to RhIG mitigates the risk of such events. METHODS: Retrospective evaluation of AHR (AEs reported with signs of hemolysis; including IVH) from the Cangene post-marketing surveillance database. RESULTS: CONCLUSION: Of the ITP patients who developed IVH, 40% reported an onset of symptoms within 4 hours of RhIG infusion; an additional 10% reported symptoms within 8 hours. The symptom onset was unidentified in 18% of IVH cases. In addition, previous uneventful administration of RhIG did not preclude the possibility of an occurrence of IVH and its complications following subsequent administration of RhIG; however, the majority (approx 84%) of reports of IVH were among RhIG naïve patients. Disclosures: Muller: Cangene: Employment. Little:Cangene: Employment. Hess:Cangene: Employment. Sinclair:Cangene: Employment.
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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 | 0.001 | 0.005 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.001 | 0.001 |
| Science and technology studies | 0.000 | 0.000 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.000 | 0.000 |
| Research integrity | 0.000 | 0.001 |
| Insufficient payload (model declined to judge) | 0.002 | 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".