Table 3 Studies of repeat US
Author & date of publication | Group | Number (%) of initial scans positive | Number (%) of repeat scans positive | Number (%) of positive scans (initial or repeat) confirmed by venography |
|---|---|---|---|---|
Heijboer, 1993 [109] | All patients | 93/491 (19%) | 7/397 (1.8%) | 84/89 (94%) |
Cogo, 1998 [110] | All patients | 400/1702 (24%) | 12/1252 (1.0%) | - |
Sluzewski, 1991 [111] | All patients | 67/174 (39%) | 0/98 (0%) | - |
Birdwell, 1998 [112] | All patients | 63/405 (16%) | 7/342 (2.0%) | 23/28 (82%) |
Birdwell, 2000 [113] | All patients | 95/709 (13%) | 9/521 (1.7%) | 39/47 (83%) |
Studies of unselected patients combined | Â | Â | 35/2610 (1.34%) | 146/164 (89.0%) |
Bernardi, 1998 [116] | Positive D-dimer | 260/946 (27%) | 5/88 (5.7%) | - |
Kraaijenhagen, 2002 [117] | Positive D-dimer | 391/1739 (22%) | 17/518 (3.0%) | - |
Studies of patients with a positive D-dimer combined | Â | Â | 22/606 (3.63%) | - |
Wells, 1997 [114] | Intermediate Wells score | 27/193 (14%) | 3/166 (1.8%) | - |
Tick, 2002 [115] | Intermediate or high Wells score & positive D-dimer | 300/531 (57%) | 13/83 (15.7%) | - |