title: Acquired factor X deficiency with associated defects in platelet aggregation. A response to corticosteroid therapy.
abstract: A 79 year old white women presented with a severe bleeding disorder. Evaluation revealed a prothrombin time of 27.6 seconds (control, 11 seconds) and an activated partial thromboplastin time of 61 seconds. Specific clotting factor assays showed an isolated deficiency of factor X ranging from 7 to 12 per cent on three determinations. Platelet aggregation and bleeding time were also abnormal in response to epinephrine and collagen. Factor X levels and platelet aggregation returned to normal and bleeding stopped after institution of corticosteroid therapy.
mesh_terms: D000368:Aged; D001760:Bleeding Time; D005171:Factor X Deficiency / Q000097:blood / Q000188:drug therapy*; D005260:Female; D006801:Humans; D007020:Hypoprothrombinemias / Q000188:drug therapy*; D010314:Partial Thromboplastin Time; D010974:Platelet Aggregation; D011241:Prednisone / Q000627:therapeutic use*; D011517:Prothrombin Time
chemical_list: D011241:Prednisone