title: Effect of therapy on the neutropenia of hyperthyroidism.
abstract: Observations in a patient with recurrent hyperthyroidism, each time associated with neutropenia which resolved after therapy, prompted a chart review of other patients referred for radioactive iodine therapy. Of 99 untreated patients, 18 had neutrophil counts of less than 2,000/cu mm. After therapy with either thionamides or 131I, 41 of 53 (77%) evaluable patients had an increase in neutrophil count. Eleven of these evaluable patients had neutropenia before therapy; after therapy, all 11 had an increase in their neutrophil counts into the normal range, with a mean increase of 170%. In one patient, studies on the mechanism of neutropenia indicate that bone marrow production and reserve remain normal and that circulating neutrophils are normally marginated. A decreased neutrophil circulation time may be the cause of neutropenia associated with hyperthyroidism.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000380:Agranulocytosis / Q000209:etiology*; D005260:Female; D006801:Humans; D006980:Hyperthyroidism / Q000150:complications / Q000532:radiotherapy*; D007457:Iodine Radioisotopes / Q000627:therapeutic use*; D007958:Leukocyte Count; D008297:Male; D008875:Middle Aged; D009503:Neutropenia / Q000209:etiology*; D009504:Neutrophils; D011441:Propylthiouracil / Q000627:therapeutic use; D012189:Retrospective Studies
chemical_list: D007457:Iodine Radioisotopes; D011441:Propylthiouracil