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Mechan Vent Test #5
Ventilator Graphics
| Question | Answer |
|---|---|
| 3 types of scalar graphics | Pressure-time, Flow-time, Volume-time |
| Time is always on which axis in scalars | x-axis |
| 2 types of Loops | Pressure-volume, Flow-volume |
| Changes in Pressure-volume loop indicate what? | changes in restriction(increase or decrease in compliance) |
| Changes in Flow-volume loops indicate what type of disease? | obstructive |
| 2 applications for Pressure-time scalar | Determine breath type and use breath type to determine mode |
| In a pressure-time scalar, a dip in pressure during breath indicates what? | insufficient flow |
| Which scalar waveform can identify obstructive disease? | flow-time |
| Which scalar waveform can identify insufficient flow? | pressure-time |
| Which loop waveform can identify obstructive disease? | flow-volume |
| Which loop waveform can identify restrictive disease | pressure-volume |
| In a pressure volume loop, volume doesnt begin until what is reached? | inflection point |
| What is the inflection point? | pressure needed to open alveoli |
| Why does compliance improve at infelction point? | alveolar recruitment |
| How do you determine optimal PEEP? | it is slightly above LIP |
| What is the upper inflection point? | change in pressure without change in volume |
| Why does a "beak" occur in Pressure-volume loop? | overdistention, overinflation of alveoli |
| When a "duckbill" or "beak" occurs on Pressure-volume loop, what do you do? | reduce Vt, pressure until disappears |
| A pressure-volume loop shifted down and right indicates | decreased compliance (increased PIP for volume) |
| A pressure-volume loop shift up and left indicates | increased compliance(decreased PIP for volume) |
| When flow doesnt return to zero baseline on a flow volume loop, what is present? | Air-trapping(Auto-PEEP) |
| In a pressure-time scalar, what does it indicate when PIP increases but Plat stays the same | increased airway resistance(obstruction) |
| How do you resolve increased airway resistance as seen in a pressure-time curve | bronchodilator, Sx, decrease I-time, Larger ETT |
| In a pressure-time scalar, what is indicated when PIP and Plat both increase? | decreased airway compliace (restrictive) |
| How do you resolve decrease in compliance as seen on pressure-time scalar? | decrease Vt, increase RR, permissive hypercapnia, PEEP therapy |
| A prolonged expiratory time seen on a flow-time scalar indicates what? | airway resistance d/t obstruction |
| How to decrease airway resistance as seen on flow time curve? | Tx, Sx, decrease I-time, larger ETT |
| If the pressure-time scalar waveform is scalloped it means flow is set too low, how cant you fix this? | decrease I-time(increase flow), bronchodilator, Sx, decrease pressure sensitivity or chang to flowby |
| A large negative deflection on a pressure-time scalar indicates what | excessive pt effort |
| How is an excessive pt effort shown on a pressure-volume loop? | a deep fishtail on the negative portion of loop |
| Any loops showing volume will show the expiratory volume less than inspiratory volume (broken loop) which is d/t | leak |
Created by:
Dabi2
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