Table 182 Duplex velocities and degree of stenosis

Positive Predictive Sensitivity (%) Specificity (%) Value (%)

Stenosis > 50%

PSV > 130 cm/s EDV > 40 cm/s Stenosis > 70%

92 88

86 82

89 85

90 86

References

1. Huston J, Meredith JE, Brown RD et al. Redefined duplex ultrasonographic criteria for diagnosis of carotid artery stenosis. Mayo Clinic Proceedings Nov 2000; V75(n):1133-n40.

2. Allen P, Jackson MR, O'Donnell SD et al. Spahenous vein versus polytetrafluoroethylene carotid patch angioplasty. Am J Surg 1997; V174(2):115-117.

3. Mays BW, Towne JB, Seabrook GR et al. Inraoperative carotid evaluation. Arch Surg 2000; V135(5):525-529.

4. Padayachee TS, Brooks MD, McGuinness CL et al. Value of intraoperative duplex imaging during supervised carotid endarterectomy. Br J Surg 2001; V88(3):389-392.

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