Monitoring of Ventilation and Air Leakage during CPAP
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Monitoring of Ventilation and Air Leakage during CPAP. Gerd Schmalisch. Clinic of Neonatology Charité-Universitätsmedizin Berlin. Outline. Ventilation and air leakage measurements during MV Peculiarities of ventilation monitoring during CPAP Theoretical background

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Monitoring of Ventilation and Air Leakage during CPAP

Gerd Schmalisch

Clinic of Neonatology

Charité-Universitätsmedizin Berlin


Outline

  • Ventilation and air leakage measurements during MV

  • Peculiarities of ventilation monitoring during CPAP

  • Theoretical background

  • Air leakages and volume correction

  • Clinical studies

  • Conclusions and outlook


Volume monitoring during MV

Displayed volume:

Vexp

Displayed air leakage:


Relationship between volume error and displayed leak during MV

Mahmoud R, et al. Acta Paediatr. 98 (2009) 1116-1122


Endotracheal tube leakage in newborns MV

Frequency distribution of ET leakage of 163 ventilated (>5h) newborns

No ET leakage:

79/163 (48%)

ET leakage < 20%:

125/163 (77%)

ET leakage >40%:

12/163 (7.4%)

Temporarily ET leakage >40% during MV

59/163 (36%)


Peculiarities of ventilation monitoring during CPAP MV

  • Different aims of monitoring

  • Different patient interfaces

  • Much higher air leakages

  • Spontaneous breathing (breath detection)

  • Worse signal-to-noise ratio

No suitable equipment !


Current ventilation monitoring during CPAP MV

Indirect methods

  • Breathing belts (inductive (RIP), capacitive)

  • Transthoracic impedance

  • Pressure capsules

    Advantages:

  • No influence on breathing (resistance, dead space)

  • Measurement of thoraco-abdominal synchrony

    Disadvantage:

  • No reliable measurement of VT, V’E,…

  • No information about air leakages


Direct ventilatory measurements during CPAP MV

Interface

  • Oro- /nasopharyngeal tube

  • Endotracheal tube

  • Face mask

  • Binasal prongs

  • Head box

  • Benveniste valve

  • Infant Flow™ nCPAP System

Schmalisch G. Yearbook equipments and technology in NIPPV - 2009


Ventilation and leak flow MV

How we can separate breathing flow and leakage flow?

(Prerequisite for breath detection and ventilation measurements)


Bubble CPAP and variable leak flow MV

Under this conditions is the separation of breathing flow and leakage flow is a big challenge!


Quantification of the air leakage - 1 MV

Schmalisch G. Year book of NIPPV 2009


Quantification of the air leakage - 2 MV

The quantification of air leakages by the leak flow is more informative than by the currently use of percentages.


Relationship between air leakage and volume error MV

- modeling and in-vitro measurements -

Volume error

V`E - measured minute ventilation

maxV‘CPAP - maximal CPAP flow

Tin/Tex - inspiratory/expiratory time

Schmalisch G, et al. Med. Eng Phys. 31 (2009) 124-130

Fischer HS,, et al. Physiol. Meas. 29 (2008) 95-107


Volume correction during CPAP MV

- in vitro study -


Clinical applications – 1 MV

Hückstädt T et al. Intens. Care Med. 29 (2003) 1134-1140

Clinical cross-over study N=69

  • Comparison of Infant Flow system vs. Babylog 8000 by TB parameters

  • Custom-made equipment (Flow-Through Technique)

  • 49/69 (72%) infants excluded due to incompensable air leaks


Clinical applications – 2 MV

Fischer HS, et al. Intens. Care Med. (2009) (in press)

Clinical cross-over study N=32

  • Air leaks during mononasal CPAP with and without nostril occlusion

  • Commercial Ventilator (Leoni M, Heinen&Löwenstein)

  • 11/32 (34.4%) infants excluded due to air leaks >90%

* After BTPS Correction

1) Schmalisch G, et al. BMC Pediatrics 2009



Effect of mouth opening on measured leak MV

Nasopharyngeal CPAP with occluded contralateral nostril

Fischer HS, et al. Intens. Care Med. 2009 (in press)


Clinical impact of air leakages during CPAP MV

Consequences of air leakages during nasal mask ventilation in adults

Rabec CA et al. Leak Monitoring in Noninvasive Ventilation. Arch Bronconeumol 2004;40(11):508-17

What is relevant for the CPAP treatment in newborns?


Conclusion MV

  • Monitoring of ventilation and air leakages during CPAP is much more difficult compared to mechanical ventilation

  • For most CPAP interfaces used in neonates no suitable measuring technique is available

  • Air leakages during CPAP (e.g. mouth leaks) are very common and should be quantified by the leak flow.

  • To which extent a breath detection (e.g. for CPAP triggering) and volume monitoring is possible in the presence of large air leakages is still unknown.

  • New clinical studies are necessary to investigate the effect of air leakages on the efficiency of the CPAP treatment.


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