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Table 2 Colour duplex ultrasound (CDU) findings in 9 patients with distal DVT at 3 weeks, and also investigated 6 weeks postoperatively

From: A follow-up study of the fate of small asymptomatic deep venous thromboses

Patient 3-week CDU 6-week CDU Prophylaxis Warfarin Phlebography
Nr 1 DVT in two soleus veins Partial regress, only one soleus vein Placebo Started at 3 weeks Negative, no DVT
Nr 2 DVT in one fibular vein Unchanged from 3 weeks Dalteparin No secondary prophylaxis Initially interpreted as negative, positive at secondary evaluation
Nr 3 DVT in one soleus vein Progress into gastrocn and fibular veins Dalteparin Started at 6 weeks Positive, performed at 6 weeks
Nr 4 DVT in one soleus vein Unchanged from 3 weeks Placebo No secondary prophylaxis Initially interpreted as negative, positive at secondary evaluation
Nr 5 DVT in one gastrocn vein Progress into one more gastrocn vein Placebo No secondary prophylaxis Not performed
Nr 6 DVT in soleus vein Progress into two fibular veins Placebo Started at 6 weeks Positive, performed at 6 weeks
Nr 7 DVT in two gastrocn veins Progress into popliteal and calf veins Placebo Started at 6 weeks Not performed
Nr 8 DVT in one soleus vein Progress into two fibular veins Dalteparin Started at 6 weeks Positive, performed at 6 weeks
Nr 9 DVT in one posterior tibial vein Progress into two fibular veins Dalteparin Started at 6 weeks Negative at 3 weeks, not performed at 6 weeks