Compensating for the Effect of Inlet Gas Temperature on Heated Humidifier Performance

Bg, Carter; Kemp, Thomas F.; Mynard, Jonathan P.; Hochmann, M; Osborne, A. D.

doi:10.1177/0310057x0303100111

Cited by 3 publications

(8 citation statements)

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“…The effect of high inlet gas temperature on humidifier performance has only recently been recognized 1 . This effect can result in a significant reduction in the production of humidification as inlet gas temperature increases above approximately 26°C.…”

Section: Discussionmentioning

confidence: 99%

“…While this may still result in absolute humidities above the recommended minimums 3-6 , humidity production is still compromised and less than maximal. A drop below the recommended minimum humidity levels does occur in particular circumstances 1 . This results from failure to maintain chamber temperatures sufficiently above inlet gas temperature to allow the humidifier to heat the water in order to produce adequate humidity.…”

Section: Discussionmentioning

confidence: 99%

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confidence: 99%

“…We have recently shown that the performance of heated humidifiers decreases as the temperature of incoming gas is increased 1 . This can result in humidity outputs below those recommended for intubated patients 1 . A recently produced heated humidifier has become available that is designed to compensate for this effect and maintain humidity output despite high incoming gas temperatures.…”

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confidence: 99%

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Compensating for the Effect of Inlet Gas Temperature on Heated Humidifier Performance

Kemp

Mynard

et al. 2003

Anaesth Intensive Care

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The humidity output of heated humidifiers may be compromised by inlet gas temperatures exceeding approximately 26°C, with humidity dropping below the recommended levels for intubated patients. A new version of the Fisher & Paykel MR850 humidifier claims to deal with this problem by offering a humidity compensation option. The present study tested this feature by measuring humidity output using the gravimetric method and a hygrometer at different inlet gas temperatures (16.6°C to 40.0°C) with compensation on and off. It was found that the compensation is effective in maintaining humidity levels despite high inlet gas temperatures.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

mentioning

confidence: 99%

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confidence: 99%

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Compensating for the Effect of Inlet Gas Temperature on Heated Humidifier Performance

Kemp

Mynard

et al. 2003

Anaesth Intensive Care

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“…There is very little information available in the public domain regarding the performance of laparoscopic humidifiers, with most data available on humidifiers for breathing circuits (7)(8)(9)(10). In laparoscopic surgery CO 2 is insufflated at very variable flow rates in contrast to breathing circuit humidifiers that tend to work with Air/O 2 at much more constant flow rates at any given time.…”

Section: Introductionmentioning

confidence: 99%

Independent testing of the Fisher & Paykel Healthcare MR860 Laparoscopic Humidification System

Sammour

Kahokehr

Hill

2010

Minimally Invasive Therapy & Allied Technologies

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In laparoscopic surgery CO2 is commonly insufflated at room temperature, with a relative humidity approaching 0%. There has been an increase in utilization of devices to warm and humidify the insufflated gas to avoid potential detrimental effects caused by desiccation. Available data on the performance of these devices are limited. We aimed to conduct independent testing of the Fisher & Paykel MR860 Laparoscopic Humidification System at variable flow rates. A 2.5l insulated chamber was constructed and a digital thermo-hygrometer placed inside it. The humidifier water vessel was weighed and exactly 30.0g of water poured in. 50.0L of CO2 was insufflated into the chamber via the humidifier at 2.0L/min, 4.0l/min, 6.0l/min, 8.0l/min, and 10l/min using a laparoscopic insufflator. Measurements of temperature and humidity in the chamber were taken at 30 second intervals. After 50.0l of gas was insufflated the water left in the humidifier was weighed, and this was used to calculate the mean absolute humidity of the insufflated gas by the gravimetric method. At every flow rate, > 98.0% relative humidity was achieved in the chamber after less than 30 seconds of insufflation. Using the gravimetric estimate, the humidifier was able to saturate 50.0l of CO2 to close to saturation humidity at every flow rate tested. The Fisher & Paykel MR860 Laparoscopic Humidification System effectively humidifies insufflated CO2 at a range of flow rates commonly used in the surgical setting.

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Estudo comparativo entre os sistemas de umidificação aquoso aquecido e trocador de calor e de umidade na via aérea artificial de pacientes em ventilação mecânica invasiva

Galvão¹,

Filho²,

Marinho³

et al. 2006

Rev. bras. fisioter.

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RESUMOContexto: Nos pacientes recebendo suporte ventilatório invasivo através de tubos endotraqueais é essencial o uso de umidificadores. Objetivo: avaliar os níveis de temperatura (T°C) e de umidade relativa (UR) do gás administrado ao paciente em ventilação mecânica através da umidificação aquosa aquecida (UAA) e do filtro trocador de calor e de umidade (FTCU). Método: Este foi um estudo prospectivo, randomizado, onde foram estudados 20 pacientes divididos em dois grupos: um grupo usou a UAA (n=10) e o outro grupo (n=10) usou FTCU Hygrobac "S", marca Mallinckrodt ® . As variáveis analisadas foram: níveis de temperatura (T) e umidade relativa (UR) do gás, volume minuto (VM), volume corrente (VC) e volume de condensação. Resultados: Verificou-se que o sistema de umidificação aquosa aquecida atingiu temperaturas mais baixas que o filtro trocador (29,01 ± 1,33 °C, versus 30,14 ± 1,24 °C; p<0,001). A umidade relativa foi maior na UAA do que no FTCU (97,45 ± 5,22 %, versus 89,87 ± 11.04 %, p < 0,021). O volume de condensação do circuito do grupo usando UAA foi maior que o do grupo usando o FTCU (p < 0,05). Conclusão: Os resultados demonstram que ambos os sistemas, UAA e o FTCU forneceram umidades absolutas abaixo do valor recomendado, sendo que o sistema de UAA ofereceu uma umidade relativa maior, enquanto que o aquecimento do gás com o FTCU obteve um melhor desempenho.Palavras-chave: umidificadores, trocadores de calor e de umidade, ventilação mecânica. ABSTRACT Comparative Study Between Heated Water Humidifiers and Hygroscopic Heat and Moisture Exchangers in Artificial Airways for Patients Undergoing Invasive Mechanical VentilationBackground: In patients receiving invasive mechanical ventilation through endotracheal tubes, the use of humidifiers is essential. Objective: To evaluate temperature and relative humidity levels in the gas administered to patients undergoing mechanical ventilation by means of heated water humidifiers (HWH) and hygroscopic heat and moisture exchangers (HHME). Method: This was a prospective randomized study on 20 patients divided into two groups: one group using HWH (n=10) and the other using the Hygrobac "S" model of HHME, made by Mallinckrodt ® (n=10). The variables analyzed were: temperature and relative humidity levels of the gas, minute volume (MV), tidal volume (V T ) and condensation volume. Results: It was found that HWH attained lower temperatures than did HHME (29.01 ± 1.33 °C versus 30.14 ± 1.24 °C; p<0.001). The relative humidity was higher in HWH than in HHME (97.45 ± 5.22% versus 89.87 ± 11.04%; p<0.021). The condensation volume in the ventilator circuit for the group using HWH was greater than for the HHME group (p<0.05). Conclusion: The results demonstrate that both systems (HWH and HHME) supplied absolute humidity that was below recommended values, while the HWH offered higher relative humidity. On the other hand, HHME produced better performance regarding gas heating.

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Compensating for the Effect of Inlet Gas Temperature on Heated Humidifier Performance

Cited by 3 publications

References 2 publications

Compensating for the Effect of Inlet Gas Temperature on Heated Humidifier Performance

Compensating for the Effect of Inlet Gas Temperature on Heated Humidifier Performance

Independent testing of the Fisher & Paykel Healthcare MR860 Laparoscopic Humidification System

Estudo comparativo entre os sistemas de umidificação aquoso aquecido e trocador de calor e de umidade na via aérea artificial de pacientes em ventilação mecânica invasiva

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