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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