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P&P Fall 2019 > Mechanical Ventilation > Flashcards

Mechanical Ventilation Flashcards

1
Q

Equation for compliance

A

Change in pressure/change in volume = Compliance

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2
Q

CMV

A

Controlled mechanical ventilation

*most commonly used in OR

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3
Q

CMV vent settings

A

Preset: TV, RR

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4
Q

Same as CMV

A

ACV, AC
*allows pt to trigger breath
—> if pt triggered, preset TV assured

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5
Q

“Control mode” in ACV

A

Pt is apneic, full support from vent

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6
Q

IMV

A

ACVC - but pt triggered breaths = their own TV

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7
Q

SIMV

A

IMV but if pt triggers, will allow pt breath

*prevents stacking

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8
Q

Goal FiO2

A

75-80% highest

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9
Q

Paw

A

Peak airway pressure

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10
Q

TV is based on

A

Weight, pathophys of lung injury

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11
Q

Normal compliance

A

70-100 mL/cm H2O

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12
Q

ARDS Compliance

A

<40-50 mL/cm H2O

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13
Q

Compliance calculation

A

[TV(Paw-PEEP)]

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14
Q

Tidal Volume —> normal lung compliance

A

5-7 mL/kg (IBW)

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15
Q

Initial vent settings

A

RR 10-20

MV 5-10 L/min

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16
Q

Minute ventilation

A

TV x RR = MV

17
Q

Sensitivity

A

Trigger

  • inspiratory flow created on own vs. when machine should trigger (are they making an effort? Low tidal volume)
  • PC or VC
18
Q

Default sensitivity

A

10%

19
Q

~ normal inspiratory flow

A

4xMV
60-75 L/min
> 75 = barotrauma

20
Q

PEEP

A

Airway pressure at end expiration (point D on ETCO2 waveform)

21
Q

Optimal PEEP

A

Point of maximal alveolar recruitment (MAR)

-if PIP > PEEP, MAR exceeded

22
Q

AE PEEP

A

Barotrauma, decr. CO

23
Q

Effect of PEEP on CO

A

Increases intrathoracic pressure —> increased RAP, decreased preload
Increases PAP —> impedes RV output, RV dilates/goes into LV—> dec. LV —> dec. CO/BP

24
Q

If PEEP >5 cm H2O

A

Subtract 1/2 PEEP > 5 from PCWP/CVP

25
Q

PSV

A

Patient triggers breath, preset pressure

26
Q

PCV

A

Pt receives breath that ceases at max pressure (pressure set on machine)

P&P Fall 2019 (17 decks)

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