Flashcards in General Deck (15)
usually refers to
chronic atherosclerotic occlusive disease of large and medium arteries, primarily of the legs
risk factors same as for CAD
Atherosclerotic luminal narrowing decreases blood flow...
in inverse proportion to length of stenosis and blood viscosity
in proportion to radius to the fourth power
What is important in determining the amount of blood flow?
radius of the lumen
if radius is reduced to half, flow is....
reduced to 1/16
pain brought on by exercise, relieved by rest
Where is the pain most common?
calf muscles when disease in femoral or popliteal arteries (the usual site) causes it
What are indicators of severe disease?
pain at rest
diminished or lost distal pulses
pallor or cyanosis
skin atrophy muscle atrophy
swishing sounds auscultated over lesions with turbulent flow
made by Hx and physical exam!!!
Physical exam useful for diagnosis
measure BP in arm and lower leg w/ pt supine...
if ratio ("ankle/brachial ratio") is <.9, no further diagnostic tests are necessary
First line treatment
exercise (esp walking)
--helps develop collaterals
penoxifylline (decreases blood viscosity)
surgery (bypass, amputation)