METABOLIC GAS EXCHANGE DURING NITROUS OXIDE ANAESTHESIA WITH CONTROLLED VENTILATION
| Autor: | H.G. Sonander, B.-Å. Henriksson, K.L. Svensson, Ola Stenqvist |
|---|---|
| Rok vydání: | 1990 |
| Předmět: |
Adult
Male Nitrous Oxide chemistry.chemical_element Oxygen Excretion chemistry.chemical_compound Oxygen Consumption Inspiratory minute volume Humans Mathematics Pulmonary Gas Exchange Nitrous oxide Carbon Dioxide Middle Aged Controlled ventilation Respiration Artificial Anesthesiology and Pain Medicine chemistry Volume (thermodynamics) Anesthesia Carbon dioxide Female Anesthesia Inhalation Respiratory minute volume |
| Zdroj: | British Journal of Anaesthesia. 64:320-326 |
| ISSN: | 0007-0912 |
| Popis: | A system for metabolic gas exchange has been used during nitrous oxide-opioid anaesthesia incorporating a Servo Ventilator 900 C and external analysers for oxygen and carbon dioxide. Oxygen consumption and carbon dioxide excretion were calculated as differences in content between inspired and expired minute ventilation. Nitrous oxide uptake was calculated similarly, assuming it was the only other gas present in addition to oxygen and carbon dioxide. The mean value for oxygen consumption was 3.25 ml kg-1 min-1, declining by 8% during the 2 h of anaesthesia. The formula for the best fit curve of nitrous oxide uptake was 18.3 . t-0.48 ml kg-1 min-1 when FIN2O was 0.7. To simplify measurement procedures and avoid measurements of expiratory volume, we also calculated metabolic gas exchange when expiratory minute ventilation was expressed as a function of inspiratory minute volume and nitrous oxide uptake. The latter value was obtained from the overall best fit curve for nitrous oxide uptake. |
| Databáze: | OpenAIRE |
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