Table 4.

Sensitivity and FNR for duplex ultrasound and arm arterial HDA of limbs showing a positive CTA result for arterial TOS (n = 19).

Test/combination	TP, n	FN, n	Sensitivity, %	FNR, %
Duplex ultrasound (n = 19)	16	3	84.2	15.8
Arm arterial HDA (n = 15)	11	4	73.3	26.7
Duplex ultrasound + arm arterial HDA (n = 15)	14	1	93.3	6.7

CTA = computed tomography angiography, FN = false-negative, FNR = false-negative rate, HDA = hemodynamic assessment, TOS = thoracic outlet syndrome, TP = true-positive.