Kininase activity in human blood.

Kininase activity in venous blood has been studied in 17 healthy persons, 15 patients with hyperthyroidism, 12 with liver diseases and 57 with other diseases. The activity of this enzyme was expressed by the destruction rate of synthetic bradykinin during the incubation with venous blood. The estimated values were 53-72% (mean 64.4±4.93%) in healthy persons. Patients with hyperthyroidism and patients with liver diseases showed markedly higher activity than normal levels. No significant changes in the activity were seen in other diseases.