A Challenging Twist in Pulmonary Renal Syndrome

الملخص EN

Case.

We report a rare case of hydralazine-induced anti-neutrophil cytoplasmic antibody-associated vasculitis.

A 75-year-old African American woman with history of high blood pressure on hydralazine for 3 years presented with acute onset of shortness of breath and hemoptysis.

Lab workup revealed a severe normocytic anemia and a serum creatinine of 5.09 mg/dL (baseline 0.9).

Bronchoscopy demonstrated active pulmonary hemorrhage.

A urine sample revealed red cell casts and a renal biopsy demonstrated pauci-immune, focally necrotizing glomerulonephritis with small crescents consistent with possible anti-neutrophil cytoplasmic antibody-positive renal vasculitis.

Serologies showed high-titer MPO-ANCA and high-titer anti-histone antibodies.

She was treated with intravenous steroids and subsequently with immunosuppression after cessation of hydralazine.

The patient was subsequently discharged from hospital after a rapid clinical improvement.

Conclusion.

Hydralazine-induced anti-neutrophil cytoplasmic antibody-positive renal vasculitis is a rare adverse effect and can present as a severe vasculitic syndrome with multiple organ involvement.

Features of this association include the presence of high titer of anti-myeloperoxidase anti-neutrophil cytoplasmic antibody with multiantigenicity, positive anti-histone antibodies, and the lack of immunoglobulin and complement deposition.

Prompt cessation of hydralazine may be sufficient to reverse disease activity but immunosuppression may be needed.