LE cells in pleural fluid.
D000368:Aged; D005260:Female; D006801:Humans; D006830:Hydralazine / Q000009:adverse effects; D008180:Lupus Erythematosus, Systemic / Q000139:chemically induced / Q000473:pathology*; D009504:Neutrophils; D010996:Pleural Effusion / Q000166:cytology*; D011342:Procainamide / Q000009:adverse effects
D006830:Hydralazine; D011342:Procainamide