USI DMS Lower Extremity Arterial Doppler
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| What causes the greatest change in blood flow? | The radius of the vessel
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| Where is the highest pressure in the arterial system? | Left ventricle
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| What affects spectral waveforms? | Sample volume size and position
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| What type of flow occurs during flow acceleration in systole or at origins of vessels? | Plug flow
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| If the diameter of a vessel determines the amount of friction, then what happens to friction and flow if the radius gets smaller? | Friction is greater and flow is less
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| Bladder pressure cuff size should be what percentage wider than the limb diameter? | 20%
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| When using cuff application, which cuff method gives more accurate pressure and which gives more accurate disease location? | 3-cuff method gives more accurate pressures and 4-cuff method gives more accurate disease location
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| What order should segmental pressures be done in? | Brachial, ankle using higher pressure of DP or PTA, calf or below knee, lower thigh or above knee, then high thigh
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| What number ABI is considered to be severe arterial disease? | Less than 0.5
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| True or false. With PVRs you can unintentionally make a normal waveform abnormal with a low gain setting? | True
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