# RESPIRATORY PHYSIOLOGY RELEVANT TO HFOV

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1 RESPIRATORY PHYSIOLOGY RELEVANT TO Physiology of CMV 1

2 What is? Ventilation using a relatively high continuous distending pressure at the airway opening, around which an oscillatory wave is generated to assist with gas exchange CPAP with a wiggle CPAP with a twist Super CPAP = pressure + wiggle 2

3 Role of transpulmonary pressure in the transition to extra-uterine life Important in: clearance of the water-filled lung establishment of an adequate FRC decreasing PVR overcoming the inefficiencies of the bellows overcoming relatively low lung compliance 3

4 Spontaneous breathing Positive pressure ventilation 4

5 What does the pressure do? OVERCOMES AIRWAY AND TISSUE RESISTANCE. P(resist) = R x (V) where R = resistance Energy lost as heat Resistive pressure drop is significant during What does the pressure do? OVERCOMES INERTIA.. P(inert) = I x (V) where I = inertance Work done to accelerate gas and tissue Negligible during CMV Much more important during 5

6 What does the pressure do? INDUCES CHANGE IN LUNG VOLUME P(vol) = 1/C x (V) where C = compliance Work done to overcome the viscoelastic forces of the lung and chest wall Relationship between pressure and volume Lung volume computation - P ln2 V = V max (1 - e h ) V max = maximum lung volume P = applied pressure h = half opening pressure Salazar & Knowles J Appl Physiol

7 Lung at full term ALVEOLAR VOLUME Micromechanics of the lung Alveolar volume (% of Vmax) Applied pressure (cm H 2 O) Alveolar volume computation - P ln2 V = V max (1 - e h ) V max = maximum alveolar volume P = applied pressure h = half opening pressure 7

8 Halter et al AJRCCM 2003 ALVEOLAR VOLUME Micromechanics of the lung Alveolar volume (% of Vmax) Applied pressure (cm H 2 O) Alveolar opening pressure (inflation): pressure at which alveolus opens from a volume of zero to a volume as determined by the Salazar-Knowles relationship 8

9 ALVEOLAR VOLUME Micromechanics of the lung Alveolar volume (% of Vmax) Applied pressure (cm H 2 O) Alveolar closing pressure (deflation): pressure at which alveolus closes to a volume of zero 9

10 cm H 2 O 14/04/15 Alveolar volume Opening and closing pressures Superimposed pressure Ventilator pressures Alveolar volume (% of Vmax) Applied pressure (cm H2O) J Clin Invest 38:

11 Ventilation within the PV relationship Rimensberger CCM 1999 Ventilation within the PV relationship Volume (%TLC) Pressure (cm H 2 O) Dargaville ICM

12 Measurement of lung volume during CMV CMV at PEEP 6 cm H 2 O 100 Thoracic gas volume (%TLC) CMV at PIP 28 cm H 2 O Pressure Physiology of CMV 12

13 Measurement of lung volume during 100 Thoracic gas volume (%TLC) Paw 22 cm H 2 O for 4 mins Pressure Pre-recruitment Paw 17 cm H 2 O sustained recruitment 100 Thoracic gas volume (%TLC) Pressure During recruitment Paw 35 cm H 2 O Post-recruitment Paw 17 cm H 2 O Pellicano et al Intens Care Med

14 during What does the wiggle do? Conventional ventilation Two mechanisms A volume of gas (tidal volume) is delivered into the airways via convective (bulk) flow When the volume reaches the respiratory bronchioles, CO 2 and O 2 are exchanged by molecular diffusion Expiration occurs secondary to passive recoil of the lung and chest wall For this process to provide effective alveolar ventilation, the volume of gas delivered must be greater than the anatomic dead space of the airways Apnoeic respiration with no tidal ventilation inevitably results in CO 2 retention 14

15 Lunkenheimer Br J Anaesth 1972 Lunkenheimer Br J Anaesth

16 High frequency oscillatory ventilation Six mechanisms Convective (bulk flow) Asymmetrical velocity profiles Taylor dispersion Pendeluft Cardiogenic mixing Molecular diffusion HK Chang J Appl Physiol 1984 Convective (bulk flow) ventilation Even with small tidal volumes, direct alveolar ventilation occurs to short path length units that branch off of the primary airways. 16

17 Asymmetrical velocity profile During inspiration, the high frequency pulse creates a bullet shaped profile, with the central molecules moving further down the airway than those molecules found on the periphery of the airway Asymmetrical velocity profile On exhalation, the velocity profile is blunted so that at the completion of each return, the central molecules remain further down the airway and the peripheral molecules move towards the mouth of the airway 17

18 Taylor dispersion Convective flow superimposed on a diffusive process, results in increased dispersion of the tracer molecules The high velocity spike of gas moves down the center of the tube, leaving the molecules on the periphery unmoved. Gas diffuses evenly through the tube when flow stops Pendeluft At high frequencies, distribution becomes strongly influenced by time constant inequalities. Gas from fast units (short time constants) will empty into the slow (long time constants) units 18

19 Molecular diffusion One of the major mechanisms for gas exchange in the alveolar regions Responsible for the gas exchange across the AC membrane and also contributes to the transport of O 2 and CO 2 in the gas phase near the membrane Cardiogenic mixing The heart beat adds to the the peripheral gas mixing 19

20 Slutsky et al NEJM Summary If you talk too much about convection and diffusion, the result in the end is both defective and confusing & Froese 1981; attributed to HK Chang 20

21 SUMMARY Continuous distending pressure during : Recruits the lung if sufficient pressure is applied on initiation to open most lung units Exploits hysteresis Retains lung volume if sufficient pressure is maintained to keep most lung units open SUMMARY Continuous distending pressure during : Recruits the lung if sufficient pressure is applied on initiation to open most lung units Exploits hysteresis Retains lung volume if sufficient pressure is maintained to keep most lung units open The oscillatory waveform during : Facilitates diffusion Promotes gas exchange by other mechanisms 21

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