Comparison of conventional heated humidification to a new active heat and moisture exchanger in the ICU

Branson, R. D.; Campbell, RS; Ottaway, Michael; Johannigman, JA

doi:10.1186/cc392

Cited by 9 publications

(10 citation statements)

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“…This indicates that the HME in the device can deal with the extra water load without becoming obstructed. Our results agree well with a very recently published study [14] that also examined the performance of the Humid-Heat in ventilator-treated patients.…”

Section: Discussionsupporting

confidence: 92%

A new device for 100 per cent humidification of inspired air

Larsson

Gustafsson²,

Svanborg

2000

Crit Care

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A new humidifier for use during mechanical ventilation in endotracheally intubated patients is described and tested. The humidifier is based on a heat-moisture exchanger, which absorbs the expired heat and moisture and releases it into the inspired air. External heat and water are then added at the patient side of the heat-moisture exchanger, so that the inspired gas should reach 100% humidity (44 mg/l) at 37°C. In bench tests using constant and decelerating inspiratory flow and minute volumes of 3-25 l the device gave an absolute humidity of 41-44 mg/l, and it reduced the amount of water consumed in eight mechanically ventilated patients compared with a conventional active humidifier. During a 24-h test period there was no water condensation in the ventilator tubing with the new device.Keywords: airway humidification, heated humidifier, intensive care, mechanical ventilation Abstract

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Section: Discussionsupporting

confidence: 92%

A new device for 100 per cent humidification of inspired air

Larsson

Gustafsson²,

Svanborg

2000

Crit Care

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“…Similar in design to the Performer is the Humid-Heat, in which external water and heat are added to the patient side of a HME circuit. The Humid-Heat can boost temperature and AH up to 37°C and 44 mgH 2 O/l, which are close to the levels achieved with conventional hot water humidifiers [8,26,27]. In addition, if the water supply runs out, all of these devices continue to work as passive HMEs, avoiding the possibility that dry gases will be delivered.…”

Section: Discussionmentioning

confidence: 68%

In vitro and in vivo evaluation of a new active heat moisture exchanger

et al. 2004

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IntroductionIn order to improve the efficiency of heat moisture exchangers (HMEs), new hybrid humidifiers (active HMEs) that add water and heat to HMEs have been developed. In this study we evaluated the efficiency, both in vitro and in vivo, of a new active HME (the Performer; StarMed, Mirandola, Italy) as compared with that of existing HMEs (Hygroster and Hygrobac; Mallinckrodt, Mirandola, Italy).MethodsWe tested the efficiency by measuring the temperature and absolute humidity (AH) in vitro using a test lung ventilated at three levels of minute ventilation (5, 10 and 15 l/min) and at two tidal volumes (0.5 and 1 l), and in vivo in 42 patients with acute lung injury (arterial oxygen tension/fractional inspired oxygen ratio 283 ± 72 mmHg). We also evaluated the efficiency in vivo after 12 hours.ResultsIn vitro, passive Performer and Hygrobac had higher airway temperature and AH (29.2 ± 0.7°C and 29.2 ± 0.5°C, [P < 0.05]; AH: 28.9 ± 1.6 mgH2O/l and 28.1 ± 0.8 mgH2O/l, [P < 0.05]) than did Hygroster (airway temperature: 28.1 ± 0.3°C [P < 0.05]; AH: 27 ± 1.2 mgH2O/l [P < 0.05]). Both devices suffered a loss of efficiency at the highest minute ventilation and tidal volume, and at the lowest minute ventilation. Active Performer had higher airway temperature and AH (31.9 ± 0.3°C and 34.3 ± 0.6 mgH2O/l; [P < 0.05]) than did Hygrobac and Hygroster, and was not influenced by minute ventilation or tidal volume. In vivo, the efficiency of passive Performer was similar to that of Hygrobac but better than Hygroster, whereas Active Performer was better than both. The active Performer exhibited good efficiency when used for up to 12 hours in vivo.ConclusionThis study showed that active Performer may provide adequate conditioning of inspired gases, both as a passive and as an active device.

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“…Umidade absoluta (mg H 2 O/L) 0 4,8 5 6,8 10 9,4 15 12,8 16 13,6 17 14,5 18 15,4 19 16,3 20 17,3 21 18,4 22 19,4 23 20,6 24 21,8 25 23,0 26 24,4 27 25,8 28 27,2 29 28,8 30 30,4 31 32,0 32 33,8 33 35,6 34 37,6 35 39,6 36 41,7 37 43,9 38 46,2 39 48,6 40 51,1 41 53,7 42 56,5 43 59,5 44 62,5 100 598,0…”

Section: Temperatura (°C)unclassified

“…Sendo assim, a via aérea superior é responsável por fornecer gás a aproximadamente 32 ºC e umidade relativa maior que 90 % para o trato respiratório inferior, no nível da carina 15 . Ao atingir os alvéolos, o ar inspirado se encontra aquecido à temperatura do corpo (cerca de 37 °C) e saturado de vapor d'água (44 mg/L) 1,10,14,16 . O ponto em que os gases igualam a temperatura corporal e se encontram saturados de vapor d'água é conhecido como limite de saturação isotérmica (ISB -Isothermic Saturation Boundary) 13 , localizado em condições normais aproximadamente 5 cm abaixo da carina 17 .…”

Section: Umidificação E Aquecimento Das Vias Aéreasunclassified

“…O princípio básico dos UAs é fazer passar o gás seco e frio através de uma câmara preenchida parcialmente com água aquecida onde, através de evaporação, o vapor d'água é misturado ao gás, elevando sua temperatura e umidade 2 . Entretanto os UAs apresentam algumas desvantagens, tais como: relativo alto custo 24,27,[29][30][31][32] e condensação do vapor d'água no circuito de ventilação (levando a um potencial de contaminação bacteriana) 27, 33 ; necessitando ainda de fornecimento de energia 17,29 e de constante suprimento de água 16,29,34 .…”

Section: Umidificadores Aquecidosunclassified

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"Avaliação e comparação de diferentes tipos de trocadores de calor e umidade"

Lucato¹

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Resumo Para uma marcha estável do Alto-Forno é necessário o controle de inúmeras variáveis de sua matéria prima, no nosso caso a discussão é o Coque, elemento resultante de um processo Pirolítico do Carvão mineral, que tem um papel fundamental no processo de Redução do Alto-Forno, onde uma de suas fraquezas é a umidade, pois a sua eliminação propicia uma reação endotérmica, roubando calor do forno, com isso perde-se nos balanços de massa e Abstract For a blast furnace stable gait is necessary to control a number of variables of its raw material, in this case the discussion is the coke, resulting element of a Pyrolytic Process Coal, which has a key role in the High Reduction process furnace, where one of his weaknesses is moisture because its elimination provides an endothermic reaction, stealing oven heat with it is lost in the mass balances and production of pig iron. Show instructively the operating principle of a Moisture Analyzer, Laboratory Analysis, among others.

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Comparison of conventional heated humidification to a new active heat and moisture exchanger in the ICU

Cited by 9 publications

References 0 publications

A new device for 100 per cent humidification of inspired air

A new device for 100 per cent humidification of inspired air

In vitro and in vivo evaluation of a new active heat moisture exchanger

"Avaliação e comparação de diferentes tipos de trocadores de calor e umidade"

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