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36 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Plethysmography measures changes in ________.
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Blood volume |
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____ in volume = increase in amount of blood present
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Increase |
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1. 2.. |
2. Venous Outflow |
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What is called: max amount of venous blood leg veins can hold? |
Venous Capacitance |
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What are the 3 steps of venous capacitance? |
2. Obstruct venous return at the thigh 3. Measure the volume increase of venous blood as it re-fills the empty deep system |
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A system with out a thrombus will show a marked _____ in volume. |
increase |
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A system fill with a clot (will/will not) drain in the first place? |
will not, therefore not show much volume increase or change in volume. |
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What is called: emptying out the veins? |
Venous Outflow |
Opposite of capacitance |
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What measures the volume change of venous blood passing thru the deep system? |
Venous Outflow |
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By allowing arterial flow into the limb but preventing it from flowing out, you will form a dam of venous blood, what is this called? |
capacitance |
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In a limb w/o clot, when the gates of the dam are open blood will (quickly/cannot quickly) flow out of limb? |
quickly |
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If there is a clot in the limb, blood (can/cannot) flow quickly out of the limb? |
cannot flow quickly |
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T/F: even with collaterals blood cannot flow quickly out of limb?
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True |
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Measurement of venous outflow time: 1. __ = normal 2. __ = abnormal |
2. >3 seconds |
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What are the 3 methods used for Venous Plethysmography? |
2. Strain-gauge plethysmography 3. Air plethysmography |
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T/F: all 3 methods used for venous plethysmography all obtain the same information? |
True |
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What info do all 3 methods of venous Plethysmography obtain? 1. 2.. |
2. Venous Outflow |
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What is the supplies of plethysmography? |
2. Large occluding thigh cuff 3. Gauge specific to type of Plethysmography being utilized |
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Strip chart recorder, how long do you run the strip chart?
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5 mm/sec
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What test measures changes in the electrical resistance?
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IPG
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What does IPG measure changes in? |
electrical resistance |
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What test is based on Ohm's Law? |
IPG |
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T/F: Electrical impedance of the tissue in the calf will vary by the change in the amount of blood the tissues contain? |
True
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T/F: Blood is less conductive than tissue |
False |
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An _____ in blood volume will reduce impedance of the tissue.
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increase |
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More blood = (higher/lower) resistance |
lower |
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T/F: changes in the impedance of the calf can be used to measure changes in blood volume? |
True |
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IPG patient position: Calf should be above or below level of the heart? |
above |
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What should the patient position be of IPG: |
Trendelenburg position |
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What is the supplies needed for an IPG? |
- 2 on lat calf (send current thru limb) - 2 on med calf (records drop In voltage) 2. Strip chart recorder 3. Large thigh cuff |
There are 3 |
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What is the 1st step of the IPG? |
drain leg and calibrate machine |
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How much do you inflate the large thigh cuff in IPG to occlude the V's?
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50 mmHg |
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When cuff is inflated, this is reflected on strip chart as an ____?
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up-swing |
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What is the max amount of pooled blood called? |
Venous capacitance |
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Assess after how many minutes during an IPG after inflating cuff? |
around 2 minutes |
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d
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r |
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