Chapter 21 Flashcards
what is a subclavian steal?
subclavian occlusion results in retrograde flow in ipsilateral vertebral artery
what are patient symptoms with subclavian steal?
usually asymptomatic
or
have blood pressure difference of >15-20
may have decreased pulses in the affected arm
T/F arm claudication is a symptom of subclavian steal
false
its rare
what will be the waveform in the vertebral artery with a subclav steal?
high resistance vascular bed
what is the surgical treatment for a subclavian steal?
bypass graft or endarectomy
what is temporal arteritis?
inflammation of the arterial wall of the superficial temporal artery or its frontal and/ or pariental branches
what sonographic appearance will a temporal arteritis have?
an anechoic halo; from edema of the intima
inflamed arterial segments usually larger in diameter with homogenous thickening evident on B mode
why would temporal arteritis lead to a stenosis?
intimal thickening
what abnormalities does an arteriography interpret?
filling defect, absent vessel, aberrant anatomy
what is the formula for diameter reduction?
{1-(d/D)} x 100
what is MR angiography?
extremely sensitive to the presence of stenosis but tends to overestimate the disease process
uses magnets
when would you use an MR angiography?
may be used when a carotid duplex study is equivocal or technically limited
what are some lifestyle modifications that can be taken to reduce further disease?
stop smoking
weight control and low cholestrol diet
what is a pharmacological approach with disease?
aspirin
what is aspirin?
an antiplatelet drug that decreases platelet aggregation resulting in decreased thrombotic acitivty
