Hydro-Therm Why do we need to us a Hydro-Therm? In normal respiration the upper airway helps to warm and humidify inspired air and to retain the warmth and moisture contained in expired air. During inspiration even cold or dry air is typically heated to 37C and fully saturated, containing 44mg H2O per litre. The drying and cooling effect is exacerbated by the presence of the tracheal tube, the normal process of re-absorption of heat and moisture by the upper airway during expiration is lost. To combat this during long surgery times the use of a passive humidification (hydro-therm) requires a heat and moisture exchanger to be positioned at the patient connection of a basic two limb breathing system. As prolonged exposure to dry ventilatory gases can lead to the following problems: Localised inflammation of the trachea A reduction in ciliary function Retention and thickening of secretions Lowering of patient temperature Reduction in Cardiopulmonary function Increased risk of tracheostomy tube occlusion Hydro-Therm 1560000 Moisture return: 31.6mg H20/l Resistance at 30L/min: 0.2 cm H20 Resistance at 60L/min: 0.8 cm H20 Compressible volume: 59ml Weight: 31g Connectors: 22F/15M-22M/15F Minimum tidal volume: 200ml

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