British Journal of Anaesthesia, 1984, Vol. 56, No. 6 637-643
© 1984 The Board of Management and Trustees of the British Journal of Anaesthesia
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INCREASE IN RESISTANCE OF IN-LINE BREATHING FILTERS IN HUMIDIFIED AIR
Intensive Therapy Unit, Royal Liverpool Hospital Prescot Street, Liverpool
A study has been performed to measure the resistance of Pall Ultipor BB50 filters when exposed to humidified air for 48 h during artificial ventilation by an Engstrom Erica ventilator fitted with a Bennett Cascade Mk2 humidifier. A marked increase in resistance wax demonstrated. A hypothesis it presented as to the aetiology of these findings together with details of minor modifications to the system which allow the use of these filters under clinically acceptable conditions.
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