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British Journal of Anaesthesia, 1992, Vol. 69, No. 6 640-642
© 1992 The Board of Management and Trustees of the British Journal of Anaesthesia

other

AN ACTIVE HEAT AND MOISTURE EXCHANGER

F. KAPADIA, M.D., M.R.C.P.1, M. P. SHELLY, F.R.C.ANAES.2, J. M. ANTHONY3 and G. R. PARK, M.D., F.R.C.ANAES.1,*

1The John Farman Intensive Care Unit, Addenbrooke's Hospital Hills Road, Cambridge CB2 2QQ
2Intensive Care Unit, University Hospital of South Manchester Withington, Manchester M20 8LR
3Tomtec NV Vogelkerslaan 18-20, 2950 Kapellen, Belgium

*Correspondence to G. R. P.

We have carried out a laboratory evaluation of an active heat and moisture exchanging filter (aHMEF). The device consists of a conventional heat and moisture exchanging filter (HMEF) with an additional heating element and water supply. It was compared with a standard HMEF using a model lung. The aHMEF with the heating element alone, reduced 2-hourly water loss compared with the HMEF (P < 0.001); with both the heating element and additional water, this was reduced further (P < 0.001). The mean catheter mount temperature with the HMEF and heater was 32.7 (SD 1.8) 0C and with the complete aHMEF was 34.6 (1.6) 0C. The maximum temperature with the heating element in use was 37.7 0C. We conclude that the aHMEF provided effective, controllable and convenient humidification of inspired gases.


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