Quizz – Society of Mechanical Ventilation

Ventilator Waveforms

Ventilator Waveforms

1 / 5

Where would you set the PEEP according to that semi-quasistatic P-V curve ?

The low inflection point or the airway closure point (red triangle) is about 11, also the maximum hysteresis (difference in volume between the inspiratory and expiratory tidal volume)

Hysteresis

2 / 5

Which image has a Stress Index > 1 indicating the need to reduce PEEP?

A: Stress Index of 1, PEEP ok

B: Stress Index > 1, Need to reduce PEEP for hyperdistention

C: Stress Index < 1, Need to increase PEEP for atelectasis

Stress Index

3 / 5

What is the Alveolar Dead Space (VDalv)

The area to the left of line 1

The area between lines 1 and 2

The area between lines 2 and 3

Alveolar Mechanics

4 / 5

What is the PMI (Pressure Muscle Index)

13 cmH2O

10 cmH2O

3 cmH2O

PMI is the difference between the peak pressure (after the inspiratory pause) - the plateau pressure (Pressure support + PEEP)

https://www.journalmechanicalventilation.com/estimation-of-inspiratory-muscle-effort-using-three-common-indices-in-various-respiratory-models-a-bench-study/

PMI is the difference between the peak pressure (after the inspiratory pause) - the plateau pressure (Pressure support + PEEP)

https://www.journalmechanicalventilation.com/estimation-of-inspiratory-muscle-effort-using-three-common-indices-in-various-respiratory-models-a-bench-study/

5 / 5

What is the Lung Compliance?

16 ml/cmH2O

26 ml/cmH2O

36 ml/cmH2O

Total respiratory compliance
= VT / Paw - PEEP Total

Total respiratory resistance
= PPIP - Pplat / V’

Chest wall compliance
= VT / End inspiratory Pes - End expiratory Pes

Chest wall resistance
= Peak Pes - End inspiratory Pes / V’

Lung compliance
= VT / End inspiratory PPL - End expiratory PPL

Lung resistance
= Peak PPL - End inspiratory PPL / V’

https://www.journalmechanicalventilation.com/can-you-calculate-the-total-respiratory-lung-and-chest-wall-respiratory-mechanics-2/

Your score is

The average score is 56%

Patient-Ventilator Dyssynchronies

Patient-Ventilator Interactions and Dyssynchronies

1 / 5

1) All Dyssynchronies are present except ?

Reverse trigger

Early cycle

Work Shifting

Patient-Ventilator Dyssynchronies

2 / 5

2) What kind of dyysynchrony in the first breath?

Delayed cycle

Reverse trigger

False trigger

Patient-Ventilator Dyssynchronies

3 / 5

3) What kind of dyssynchrony do you see in the figure above?

Reverse trigger

Delayed cycle

Ineffective (missed) trigger

Patient-Ventilator Dyysynchronies

4 / 5

4) What is the reason for the altered expiratory flow ?

Delayed cycle

Volume leak

Expiratory work

5 / 5

5) What combination of dyssynchronies seen in the image above?

Reverse trigger & Early cycle

Reverse trigger & Delayed cycle

Delayed trigger & Delayed cycle

Your score is

The average score is 55%

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