Principles of Mechanical Ventilation: A Graphics-Based Approach

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1 Principles of Mechanical Ventilation: A Graphics-Based Approach Steven M. Donn, MD, FAAP Professor of Pediatrics Neonatal-Perinatal Medicine C.S. Mott Children s Hospital University of Michigan Health System

2 DATA

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9 The Importance of Graphics

10 Why is it Important? Assists in optimizing mechanical ventilation parameters (PIP, PEEP, Ti, tidal volume, flow rate) Allows evaluation of spontaneous respiratory effort and interaction with the ventilator Determines infant s response to pharmacologic agents (surfactant, diuretics, steroids, bronchodilators) Trends monitored events and ventilator parameters over time

11 Basic Principles Oxygenation is proportional to mean airway pressure (PIP, PEEP, Ti, and rate) Ventilation is proportional to the product of frequency and Vt (amplitude, or PIP-PEEP) In CMV, carbon dioxide removal = f X Vt In HFV, carbon dioxide removal = f X (Vt) 2

12 Ways to increase Mean Paw 20 Pressure (cm H 2 O) Increase PIP 2. Increase PEEP 3 3. Increase I-time 4. Increase flow rate (5. Increase vent rate) 2 Ti Te Ti Time (sec)

13 Overview Pulmonary waveforms Pressure waveform Flow waveform Volume waveform Pulmonary loops and mechanics Pressure-volume loop Flow-volume loop

14 Pulmonary Waveforms Pressure vs Time Flow vs Time Volume vs Time Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

15 Pressure Waveform Area under the curve = mean airway pressure Inspiration(red) Expiration(blue) PIP Ti PEEP Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

16 Flow Waveform Inspiratory phase(positive) Peak inspiratory flow Accelerating flow Expiratory phase(negative) Peak expiratory flow Decelerating flow Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

17 Flow Waveform Gas Trapping Before the decelerating expiratory waveform reaches baseline(0 flow), the accelerating inspiratory flow wave of the next breath begins(below 0 flow) Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

18 Flow Waveform Distinguishing Breath Types Sinusoidal wave form seen in pressure ventilation Square waveform seen in volume ventilation Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

19 Flow Waveform Expiratory Resistance Lower resistance has a steeper decelerating expiratory waveform Sinha SK, Nicks JJ, Donn SM. Graphic analysis of pulmonary mechanics in neonates receiving assisted ventilation. Arch Dis Child Fetal Neonatal Ed 1996; 75: F213-F218.

20 Flow Waveform - Turbulence Noisy appearance of the waveform Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

21 Volume Waveform Similar to the previously viewed pressure waveform with the exception that the volume waveform should start and end at a baseline of 0 volume Inspiration(red) Expiration(blue) Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

22 Autocycling Rhythmic breaths without a pause and a large ETT leak shown by the expiratory volumes not returning to baseline (0 volume) Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

23 Pressure-Volume Loop Volume Expiration PIP Pressure Inspiration PEEP Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

24 Pressure-Volume Loop Compliance = Volume Pressure Good compliance will have a compliance axis >45 if axes are properly scaled. Compliance Axis Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

25 Pressure-Volume Loop - Compliance Poor compliance Good compliance Slope ~30 Slope ~45 Sinha SK, Nicks JJ, Donn SM. Graphic analysis of pulmonary mechanics in neonates receiving assisted ventilation. Arch Dis Child Fetal Neonatal Ed 1996; 75: F213-F218

26 Pressure-Volume Loop Inadequate PEEP Delay in volume delivery despite increasing pressure, indicating suboptimal opening pressure Sinha SK, Nicks JJ, Donn SM. Graphic analysis of pulmonary mechanics in neonates receiving assisted ventilation. Arch Dis Child Fetal Neonatal Ed 1996; 75: F213-F218

27 Pressure-Volume Loop Lung Overinflation Flattening of the volume curve indicates: -The ventilator delivers volume that is in excess of lung capacity -Excessive pressure without an increase in volume This can be numerically depicted by using the C20/C as shown. Figure courtesy of Dr. Mark Mammel

28 Pressure-Volume Loop Lung Overinflation Image at:

29 Pressure-Volume Loop Inadequate Flow Inadequate flow as evidenced by: -Narrow loop -Little separation between the inspiratory and expiratory limbs - Figure 8 appearance at the end of inspiration Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

30 Flow-Volume Loop Peak inspiratory flow Flow Inspiration(positive) Expiration(negative) Volume Peak expiratory flow Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

31 Flow-Volume Loop - Resistance Increased resistance(lower peak inspiratory and expiratory flows) Decreased resistance(higher peak inspiratory and expiratory flows) Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

32 Flow-Volume Loop ETT Leak The expiratory flow loop does not reach the origin Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

33 Flow-Volume Loop - Turbulence Noisy appearance of the loops Becker MA, Donn SM. Real-time pulmonary graphic monitoring. Clin Perinatol 2007; 34: 1-17

34 Time Constant Time constant (sec) = Resistance (cm H 2 O/L/sec) X Compliance (L/cm H 2 0) One time constant is defined as the time necessary for alveolar pressure to reach 63% of the change in airway pressure.

35 Time Constant % 95% 98% 99% Change in Pressure (%) % Time Constants

36 Time Constant: Healthy Infant Resistance = 30 cm H 2 O/L/sec x Compliance = L/cm H 2 O Time Constant = 0.12 sec For near complete equilibration (5 TC) = 5 x 0.12 sec = 0.6 sec

37 Time Constant: RDS Resistance = 100 cm H 2 O/L/sec x Compliance = L/cm H 2 O Time Constant = 0.05 sec For near complete equilibration (5 TC) = 5 x 0.05 sec = 0.25 sec Lungs with decreased compliance will complete inflation & deflation quicker

38 Time Constant Time constant becomes critical when Ti or Te is so short that it is insufficient for pressure equilibration. If Ti is too short (<5 TC) incomplete tidal volume may be delivered If Te is too short (<5 TC) Incomplete expiration Increase in FRC Inadvertent PEEP

39 Practical Hints Make sure graphs are properly scaled - P and V axes should be equal - Wave forms should not be off scale Check for leaks, condensation, and secretions When all else fails, LOOK AT THE BABY!

40 Pulmonary Graphics You can observe a lot by watching. -Yogi Berra

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