Purpose: We assessed the performance of heated wire humidifiers (HWHs), which should avoid water condensation in the circuit. Methods: We evaluated the efficiency of 3 HWHs, MR850 (Fisher & Paykel, Auckland, New Zealand), CONCHATHERM IV (Hudson RCI, Temecula, Calif), and DAR HC 2000 (Mallinckrodt DAR, Mirandola, Italy), in comparison with that of the MR730 heated humidifier (HH), which has a standard circuit. We measured gas temperature and absolute humidity (AH) at the Y piece of the ventilatory circuit using a test lung ventilated at 2 minute ventilation volumes (5 and 15 L/min). Temperature levels at the Y piece of the ventilatory circuit of the HHs were set at 35°C, 37°C, and 39°C with different gradients (-2°C, 0°C, and +2°C) between the outlet chamber and the Y piece of the ventilatory circuit. Results: At the set temperature levels of 35°C, 37°C, and 39°C with a gradient of 0°C, the MR850 and CONCHATHERM IV had lower gas temperature and AH levels as compared with the DAR HC 2000 and MR730 HH. With increasing temperature gradient, gas temperature increased only with the CONCHATHERM IV but AH increased with all the HWHs. The MR850 showed lower gas temperature and AH levels as compared with CONCHATHERM IV. The condensate was abolished inside the inspiratory circuit with the HWHs. Conclusions: Heated wire humidifiers eliminate water condensation but present significant differences in gas temperature and AH levels that are lower than the expected settings. © 2007 Elsevier Inc. All rights reserved.

Performance of heated wire humidifiers : An in vitro study / P. Pelosi, D. Chiumello, P. Severgnini, C.E. De Grandis, L. Landi, L.M. Chierichetti, A. Frigerio, M. Munaro, G. Park, M. Chiaranda. - In: JOURNAL OF CRITICAL CARE. - ISSN 0883-9441. - 22:3(2007), pp. 258-264.

Performance of heated wire humidifiers : An in vitro study

D. Chiumello;C.E. De Grandis;L. Landi;A. Frigerio;
2007

Abstract

Purpose: We assessed the performance of heated wire humidifiers (HWHs), which should avoid water condensation in the circuit. Methods: We evaluated the efficiency of 3 HWHs, MR850 (Fisher & Paykel, Auckland, New Zealand), CONCHATHERM IV (Hudson RCI, Temecula, Calif), and DAR HC 2000 (Mallinckrodt DAR, Mirandola, Italy), in comparison with that of the MR730 heated humidifier (HH), which has a standard circuit. We measured gas temperature and absolute humidity (AH) at the Y piece of the ventilatory circuit using a test lung ventilated at 2 minute ventilation volumes (5 and 15 L/min). Temperature levels at the Y piece of the ventilatory circuit of the HHs were set at 35°C, 37°C, and 39°C with different gradients (-2°C, 0°C, and +2°C) between the outlet chamber and the Y piece of the ventilatory circuit. Results: At the set temperature levels of 35°C, 37°C, and 39°C with a gradient of 0°C, the MR850 and CONCHATHERM IV had lower gas temperature and AH levels as compared with the DAR HC 2000 and MR730 HH. With increasing temperature gradient, gas temperature increased only with the CONCHATHERM IV but AH increased with all the HWHs. The MR850 showed lower gas temperature and AH levels as compared with CONCHATHERM IV. The condensate was abolished inside the inspiratory circuit with the HWHs. Conclusions: Heated wire humidifiers eliminate water condensation but present significant differences in gas temperature and AH levels that are lower than the expected settings. © 2007 Elsevier Inc. All rights reserved.
condensation; heated wire humidifier; mechanical ventilation; analysis of variance; equipment design; heating; humans; in vitro techniques; random allocation; respiration, artificial; technology assessment, biomedical; temperature; humidity; critical care and intensive care medicine
Settore MED/41 - Anestesiologia
JOURNAL OF CRITICAL CARE
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2434/513971
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