Systemic Lupus Erythematosus and Anti-Neutrophil Cytoplasmic Antibody-Associated Vasculitis Overlap Syndrome vs. Drug-Induced Autoimmune Disease: A Diagnostic Challenge
Bibliographic record
Abstract
Introduction: Autoimmune conditions with renal involvement often have a wide range of clinical symptoms and laboratory findings suggestive of more than one autoimmune disease. Therefore, antibodies and clinical features play a significant role in guiding the initial treatment choices of clinicians, especially when patients present acutely. Case Description: A 79-year-old female presented to the emergency department with worsening shortness of breath and fatigue. Laboratory results showed a serum creatinine of 213 umol/L (baseline 90 umol/L). Urine analysis showed 3+ blood and +2 protein. ANA was positive with a titre of 1:2560, C3 was low at 0.52, C4 was low at 0.13, anti-double-stranded DNA (dsDNA) was positive 48.2. Further autoimmune workup revealed positive anti-SSA and anti-SSB, positive ANCA with a perinuclear pattern and elevated anti-MPO antibody (>200); Histone Ab was elevated with a ratio of 1.2. Bronchoscopy showed diffuse alveolar hemorrhage. Past medical history included resistant hypertension, and, two years prior, the patient had been started on hydralazine with increasing doses. The patient denied any history of rashes, arthritis, myalgias or family history of autoimmune disease. Hydralazine was discontinued and the patient was pulsed with corticosteroids. She was then transitioned to oral prednisone and mycophenolate mofetil with improvements in renal function. Hydroxychloroquine was later added and the patient's urine analysis normalized. Discussion: Hydralazine-induced ANCA vasculitis is reported in the literature and can be associated with elevated ANCA MPO-antibodies and positive dsDNA, ANA and anti-histone antibodies. We present a patient of advanced age who was thought to have lupus nephritis as an initial presentation of systemic lupus erythematosus or SLE/AAV overlap syndrome. Still, given her advanced age, clinical presentation, positive antibodies, and recent hydralazine use, the diagnosis of hydralazine-induced ANCA vasculitis was also considered a likely diagnosis. Without renal biopsy it is difficult to say with complete certainty the exact renal pathology however, treatment response with immunosuppression was achieved and despite using less aggressive treatments the patient expired secondary to infectious complications.
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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 | 0.003 | 0.007 |
| Meta-epidemiology (narrow) | 0.001 | 0.001 |
| Meta-epidemiology (broad) | 0.002 | 0.001 |
| Bibliometrics | 0.003 | 0.001 |
| Science and technology studies | 0.002 | 0.002 |
| Scholarly communication | 0.003 | 0.006 |
| Open science | 0.002 | 0.002 |
| Research integrity | 0.005 | 0.004 |
| Insufficient payload (model declined to judge) | 0.004 | 0.002 |
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".