ASRT - Vascular Sonography Registry Review, Ultrasound Vascular Registry Review Complete Exam Questions & Answers

ASRT - Vascular Sonography Registry Review, Ultrasound Vascular Registry Review Complete Exam Questions & Answers-A channel that diverts blood flow form 1 artery to another; usually done to shunt flowaround an occluded portion of a vessel? - Bypass A conduit that can be prosthetic material or autogenous vein used to divert blood flow from one artery to another? - Graft A connect between an artery and vein that was created as a result of surgery? - AV Fistula A connection created surgically to connect 2 vessels that were not formerly connected? - Anastomosis A dumbbell shaped vein has what type of transmural pressure? low or high? - Low transmural pressure, while a circular shap vein has high transmural pressure. A horizontal difference of or = to 20-30mmHg suggests obstructive disease at or above the level of which leg? - At or above the level in the leg with lower pressure. A lower extremity has a brownish discoloration, what can that represent? - Venous statis ususally in lower leg-to-ankle area (gaiter zone) A patient presents w/ a history of aching and cramping abdominal pain 15-30 minutes after meals. What would you suspect to be the problem? - Mesenteric ischemia or mesenteric angina; which may be due to stenosis or occlusion of the SMA, celiac, or IMA. An increase in blood flow; this can occur following exercise; it can also occur following restoration of blood flow following periods of ischemia. - Hyperemia Analog Doppler are not capable of portraying velocities less than what cm/sec? - No velocities 6cm/sec Arteries progressively decrease in size from the largest being __ and the smallest being ___? - A. Largest = Aorta B. Smallest = Arterioles Arterioles are considered what type of vessels and assist in regulating what? - a. Arterioles are considered resistance vessels b. They assist in regulating blood flow through contraction and relaxation. As the inflow pressure falls as a result of stenosis, what is the natural response of the periphery vessels? Vasodilate or vasoconstrict? - Vasodilate At the inguinal ligament, what does the external iliacs turn into? - Common femoral arteries At what point in a stenosis is flow reversals, flow separation, and vortices / eddy currents seen? - Exiting the stenosis, post-stenotic turbulence. At what point in a stenosis is spectral broadening and elevated velocities seen? - Entering the stenosis, with the high velocity at the narrowest part of the stenosis. At what point in a stenosis is the flow frequencies dampened, with or without disturbance? - Proximal to a stenosis At what toe pressure is it evident that a foot or toe ulcer has failed to heal? - or = 30mmHg Basilar artery is formed by the confluence of what arteries? - Vertebral arteries Both renal arteries are found anteriorly or posteriorly to the renal veins? - Posteriorly Brescia-Cimino fistula, straight, & looped synthetic graft are all types of what? - Dialysis access examples Carrying blood from superficial veins into deep veins is acomplished by what veins? - Perforators