Diagnosis of deep vein thrombosis with 99mTc-streptokinase: a clinical comparison with phlebography.

Nineteen patients with signs of deep vein thrombosis in the legs were investigated with a new technique using (9 9m)Tc-streptokinase. This compound is probably superior to iodine-labelled fibrinogen in detecting established thrombi. The ratio between the activity in the leg with suspected thrombosis and the other leg was calculated. The results were compared with those obtained with phlebography. A pathologically high activity ratio was found in 11 out of 13 patients in whom phlebography showed a thrombus, while the ratio was normal in the remaining six patients who showed no thrombus on phlebography. No negative correlation was found between the activity ratio and the titrated initial dose of streptokinase. The activity ratio as well as diagnosing the presence of a thrombus may also provide a guide for therapy.