2Johansson A, Lundberg D, Luttropp HH. The effect of heat and moisture exchanger on humidity and body temperature in a low-flow anaesthesia system. Acta Anaesthesiol Stand ,2003,47:564-568.
3Williams DJ, Stacey MR. Rapid and complete occlusion of a heat and moisture exchange filter by pulmonary edema. Can J Anaesth, 2002,49: 126-131.
4Casta A, Houck CS. Acute intraoperative endotracheal tube obstruction associated with a heat and moisture exchanger in an infant. Anesth Analg, 1997,84 : 939-940.