Vascular Sonography-Arterial Hemodynamics Exam Questions with complete Solutions Rated A+
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Course
Vascular Sonography
Institution
Vascular Sonography
Vascular Sonography-Arterial Hemodynamics Exam Questions with complete Solutions Rated A+
Vascular Resistance - Answers [R=Change in P/Q] R=Resistance Change in P= Pressure drop Q=Flow
Total Resistance - Answers R=R1+R2+R3 Total resistance of the entire system equals the sum of the individual res...
Vascular Sonography-Arterial Hemodynamics Exam Questions with complete Solutions Rated A+
Vascular Resistance - Answers [R=Change in P/Q] R=Resistance Change in P= Pressure drop Q=Flow
Total Resistance - Answers R=R1+R2+R3 Total resistance of the entire system equals the sum of the
individual resistances.
Low Peripheral Resistance - Answers -Dilated distal arteriolar bed
-Antegrade flow thru cardiac cycle
-Typical of vessels that supply organs
High Peripheral Resistance - Answers -Slight vascoconstriction of distal arterioles.
-Results in antegrade and retrograde glow
-Typical of vessels that perfuse muscles
Arterial Waveforms - Answers - Triphasic
-Biphasic
-Monophasic
Laminar blood flow - Answers Normal, undisturbed flow. Fastest speeds are on the inside and slowest
are next to the walls. Also known as Parabloic
Plug blood flow - Answers Very little difference in flow speeds across the vessel. This is usually found in
larger vessels or at the entrance to a vessel.
Disturbed blood flow - Answers Flow is disorderly but not yet turbulent. May occur at the natural
bifurcation of the vessels.
Turbulent blood flow - Answers Random chaotic flow with aliasing velocities. Usually turbulence is found
immediately past the actual stenosis.
This is referred to as post stenotic turbulence.
Collaterals - Answers -Vessels that are preexisting pathways that enlarge with a stenosis or occlusion.
-This is the main mechanism to compensate for Stenosis.
-Helps reduce resistance at the stenotic area, providing an alternate pathway for blood to reach distal
vascular bed.
Three major resistance factors - Answers 1- Vessel length- As length increases resistance increases
2-Fluid velocity- As viscosity increases, resistance increases.
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