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Humidification during high-frequency oscillation ventilation is affected by ventilator circuit and ventilatory setting.
Paediatr Anaesth. 2009 Aug; 19(8):779-83.PA

Abstract

BACKGROUND

High-frequency oscillation ventilation (HFOV) is an accepted ventilatory mode for acute respiratory failure in neonates. As conventional mechanical ventilation, inspiratory gas humidification is essential. However, humidification during HFOV has not been clarified. In this bench study, we evaluated humidification during HFOV in the open circumstance of ICU. Our hypothesis is that humidification during HFOV is affected by circuit design and ventilatory settings.

METHODS/MATERIALS

We connected a ventilator with HFOV mode to a neonatal lung model that was placed in an infant incubator set at 37 degrees C. We set a heated humidifier (Fisher & Paykel) to obtain 37 degrees C at the chamber outlet and 40 degrees C at the distal temperature probe. We measured absolute humidity and temperature at the Y-piece using a rapid-response hygrometer. We evaluated two types of ventilator circuit: a circuit with inner heating wire and another with embedded heating element. In addition, we evaluated three lengths of the inspiratory limb, three stroke volumes, three frequencies, and three mean airway pressures.

RESULTS

The circuit with embedded heating element provided significantly higher absolute humidity and temperature than one with inner heating wire. As an extended tube lacking a heating wire was shorter, absolute humidity and temperature became higher. In the circuit with inner heating wire, absolute humidity and temperature increased as stroke volume increased.

CONCLUSION

Humidification during HFOV is affected by circuit design and ventilatory settings.

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Authors+Show Affiliations

Chikata Y
Department of Emergency and Critical Care Medicine, The University of Tokushima Graduate School, Tokushima 770-8503, Japan.
Imanaka H
No affiliation info available
Onishi Y
No affiliation info available
Ueta M
No affiliation info available
Nishimura M
No affiliation info available

MeSH

HeatingHigh-Frequency VentilationHumansHumidityInfant, NewbornInhalationIntensive Care, NeonatalRespiratory InsufficiencyTemperatureVentilators, Mechanical

Pub Type(s)

Evaluation Study
Journal Article

Language

eng

PubMed ID

19624365

Citation

Chikata, Yusuke, et al. "Humidification During High-frequency Oscillation Ventilation Is Affected By Ventilator Circuit and Ventilatory Setting." Paediatric Anaesthesia, vol. 19, no. 8, 2009, pp. 779-83.
Chikata Y, Imanaka H, Onishi Y, et al. Humidification during high-frequency oscillation ventilation is affected by ventilator circuit and ventilatory setting. Paediatr Anaesth. 2009;19(8):779-83.
Chikata, Y., Imanaka, H., Onishi, Y., Ueta, M., & Nishimura, M. (2009). Humidification during high-frequency oscillation ventilation is affected by ventilator circuit and ventilatory setting. Paediatric Anaesthesia, 19(8), 779-83. https://doi.org/10.1111/j.1460-9592.2009.03068.x
Chikata Y, et al. Humidification During High-frequency Oscillation Ventilation Is Affected By Ventilator Circuit and Ventilatory Setting. Paediatr Anaesth. 2009;19(8):779-83. PubMed PMID: 19624365.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Humidification during high-frequency oscillation ventilation is affected by ventilator circuit and ventilatory setting. AU - Chikata,Yusuke, AU - Imanaka,Hideaki, AU - Onishi,Yoshiaki, AU - Ueta,Masahiko, AU - Nishimura,Masaji, PY - 2009/7/24/entrez PY - 2009/7/25/pubmed PY - 2009/10/23/medline SP - 779 EP - 83 JF - Paediatric anaesthesia JO - Paediatr Anaesth VL - 19 IS - 8 N2 - BACKGROUND: High-frequency oscillation ventilation (HFOV) is an accepted ventilatory mode for acute respiratory failure in neonates. As conventional mechanical ventilation, inspiratory gas humidification is essential. However, humidification during HFOV has not been clarified. In this bench study, we evaluated humidification during HFOV in the open circumstance of ICU. Our hypothesis is that humidification during HFOV is affected by circuit design and ventilatory settings. METHODS/MATERIALS: We connected a ventilator with HFOV mode to a neonatal lung model that was placed in an infant incubator set at 37 degrees C. We set a heated humidifier (Fisher & Paykel) to obtain 37 degrees C at the chamber outlet and 40 degrees C at the distal temperature probe. We measured absolute humidity and temperature at the Y-piece using a rapid-response hygrometer. We evaluated two types of ventilator circuit: a circuit with inner heating wire and another with embedded heating element. In addition, we evaluated three lengths of the inspiratory limb, three stroke volumes, three frequencies, and three mean airway pressures. RESULTS: The circuit with embedded heating element provided significantly higher absolute humidity and temperature than one with inner heating wire. As an extended tube lacking a heating wire was shorter, absolute humidity and temperature became higher. In the circuit with inner heating wire, absolute humidity and temperature increased as stroke volume increased. CONCLUSION: Humidification during HFOV is affected by circuit design and ventilatory settings. SN - 1460-9592 UR - https://www.unboundmedicine.com/medline/citation/19624365/Humidification_during_high_frequency_oscillation_ventilation_is_affected_by_ventilator_circuit_and_ventilatory_setting_ L2 - https://doi.org/10.1111/j.1460-9592.2009.03068.x DB - PRIME DP - Unbound Medicine ER -