[Effect of a heat and humidity exchanger (Humid-Vent-Mini) on the carbon dioxide washout effect of a neonatal ventilation model].
The influence of the heat-und humidity-exchanger Humid-Vent-Mini on CO2-washout was examined in an neonate lung model varying leakage, pressure and flow. We compared the performance of Humid-Vent-Mini to an exchanger modified and simplified by us in which the filter has been attached directly to the connector of the tracheal tube and to a system without any exchanger. In order to examine the influence of dryness and humidity we examined the exchanger in both states. Under all conditions the heat- and humidity exchanger Humid-Vent-Mini exhibited a significant CO2-retention (p less than 0.01). The modified type also showed a CO2-retention which was markedly lower compared to Humid-Vent-Mini (p less than 0.01). The CO2-washout effect (when measured under conditions of small leakage, reduced pressure and flow) was slightly better in a moist state of the filter compared to complete dryness (p less than 0.01). These results show, that the use of heat- and humidity-exchanger is not advisable.
Nikischin
W
W
Abteilung Allgemeine Pädiatrie, Universitäts-Kinderklinik, Kiel.
D002245:Carbon Dioxide / Q000502:physiology*; D006801:Humans; D006813:Humidity; D007231:Infant, Newborn / Q000502:physiology*; D008953:Models, Anatomic; D009330:Nebulizers and Vaporizers; D011659:Pulmonary Gas Exchange / Q000502:physiology*; D012123:Pulmonary Ventilation / Q000502:physiology; D013696:Temperature; D012122:Ventilators, Mechanical
D002245:Carbon Dioxide
Einfluss des Wärme- und Feuchtigkeitsaustauschers (Humid-Vent-Mini) auf den Kohlendioxydauswascheffekt am Neugeborenenbeatmungsmodell.