The temperature and humidity in a low-flow anesthesia workstation with and without thermal insulation of the breathing circuit or heat and moisture exchangerThe Dräger Fabius GS Premium (Germany) has a built-in hot plate to heat the gases in the breathing circuit and the fresh gas flow is (FGF) mixed to the exhaled gases after the soda lime canister. The temperature and the humidity of the inspired gas of this anesthesia machine have not yet been investigated. We hypothesized that the inspiratory temperature and the humidity provided in a low FGF (1L/min) from Dräger Fabius anesthesia workstation is inadequate during surgery. In addition, the operating room temperature influences the temperature of the gases in the breathing circuit. Adding a heat and moisture exchanger (HME) or a thermal insulation of the breathing tubes would increase the inspiratory temperature and humidity to acceptable values.The aim of the study will be to measure the temperature and humidity of the inspired low FGF from the respiratory system of the Dräger Fabius with or without a HME or a thermal insulation of the breathing tubes. Forty patients, who will be scheduled for elective open abdominal surgery under intravenous anesthesia and low FGF, will be randomly divided into four groups: 10 patients will have an HME placed in the breathing circuit; 10 patients willl have a thermal insulation of the breathing tubes; 10 patients will receive thermal insulation of the breathing tubes and an HME ; 10 patients will not receive an HME or thermal insulation of the breathing tubes. Temperature and relative and absolute humidity of the inspired gases will be measured at 15 minutes after respiratory circuit installation and in the next 30, 60, 90 and 120 minutes afterwards.Keywords: heat and moisture exchanger, humidification, breathing circuit, thermal insulation.
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