How does impedance plethysmography determine the presence or absence of deep vein throm-bosis?
a. Notes resistance to electrical current asso-ciated with blood flow.
b. Radioactive isotopes target clots and show "hot" on gamma cameras.
c. Uses ultrasonic waves to delineate the presence of clot or clots.
d. Uses radiographic technique to spot the clots.
ANS: A
Impedance plethysmography, a noninvasive method, measures electrical impedance to blood flow, which changes with inflation and deflation of a lower-extremity cuff.
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