Chapter 22 - Atypical vascular disorders

Question 1

Blood pressure difference in subclavian steal

Answer 1

> 15-20 mmHg between the two arms

Question 2

Progression of vertebral flow with worsening subclavian stenosis

Answer 2

Mild = early deceleration
Mod = to-and-fro flow
Severe/occluded = reversal of flow

Question 3

Takayasu classifications (4 types) for involvement

Answer 3

Type 1 = branches of the aortic arch
Type 2 = ascending aorta, thoracic descending and aortic arch and branches
Type 3 = thoracic descending aorta, abdominal aorta, renal arteries
Type 4 = abdominal aorta, renal artery and pulmonary arteries

Question 4

Temporal arteritis ultrasound signs

Answer 4

1) Accelerated flow
2) narrowed segment on B mode
3) anechoic halo around vessel secondary to edema