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PPG
PPG for final
| Question | Answer |
|---|---|
| PPG | documents venous insuffciency |
| PPG | has a quantitate venous (not qual) this gives number |
| screening procedure for detection of venous reflux | PPG |
| Limitations of PPG | acute dvt (contra), improper placement (like on varicose veins wont get accurate), thickening of skin ( bec/ wont penetration), or non intact skin (cant use tape) |
| PT positioning for PPG | pt has dangling legs and non weight bearing |
| This measures volume changes | these are physical properties of PPG |
| photo is not true plethysmography because | its not true wont measure volume just light reflection |
| Photo is done where? | in microcirculation |
| Photocell consitst of | light emitting diode and photo sensor |
| diode trasmits infared light into subcut. Tissue, this is | reflected back to sensor |
| Is light absorbed with photo pleth? | no it is reflected back |
| what determines the reflection of the light in PPG | cutaneous blood flow how fast |
| blood attenuates light in proportion to its | content in the tissue |
| increased blood flow results in | decreased reflection (but this is displayed as an increase/positive deflection on the waveform bigger waveform) |
| DC mode used for | venous (doppler). detects slower changes in blood content. |
| AC mode used for | arterial. Detects fast changes in blood content |
| calibration for PPG do not calibrate as with air pleth why? | need same size or gain throughout so show signif. volume difference |
| tiny arterial pulsations | normal for tiny veins |
| where put sensors | 5 |
| What use with strip recorder | slow speed (5 mm/sec) |
| stylus records on | heat sensitive paper |
| what do you instruct pt to do at beginning of exam? | complete a series of exaggerated dorsiflexions to empty calf veins |
| what do you do if pt can not do dorsi flexions? | manually compress calves bilaterally to ensure consistency |
| Why continue to obtain tracing after flexions/compressions? | to record venous refill time/venous reactive time(VRT) |
| if the VRT is <20 sec what do you do? | repeat the exam to eliminate influence of superficial system |
| what is a normal VRT? | > or greater than 20 seconds without tourniquet |
| Interpretation VRT is | quantitative |
| for superficial incompetence in VRT is? | Less than 20 seconds w/o tourniquet but normalizes (>20) w/ tourniquet |
| deep system incompetence in VRT is? | VRT of <20 sec. W/ and w/o tourniquet application |
| Artifact due to pt movement | study technically impossible due duplex |
| Absent deflections or gross irregular tracings? | ensure equipment is on DC mode and PPG settings |
| Deflections off the scale or barely discernible? | adjust gain setting (only at first of test) |
| Normal then? | normal VRT |
| Short time VRT then repeat then normal means | superficial venous incompetence |
| short time VRT then repeat then short means | deep venous incompetence |
Created by:
hseratt
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