التفاصيل البيبلوغرافية
| العنوان: |
AN EXPERIMENTAL STUDY OF GASEOUS HOMEOSTASIS AND THE MAGILL CIRCUIT USING LOW FRESH GAS FLOWS |
| المؤلفون: |
CONWAY, C. M., DAVIS, F. M., KNIGHT, H. J., LEIGH, J. M., PRESTON, T. D., TENNANT, R. |
| المصدر: |
BJA: British Journal of Anaesthesia; May 1976, Vol. 48 Issue: 5 p447-447, 1p |
| مستخلص: |
Gas concentrations and ventilation levels have been measured within a conventional Magill circuit when conscious volunteers breathed a non-narcotic gas mixture at varying fresh gas flows. When evidence of rebreathing of alveolar gas was detected, the fresh gas flow was kept constant until a steady state developed. All subjects showed evidence of rebreathing when the fresh gas flow approached the predicted alveolar ventilation levels. A variety of subject-circuit interactions was seen and shown to be precipitated by naturally occurring breath-to-breath variations in ventilation. A single large breath could perturb the system. This could have a temporary effect, when the fresh gas flow was sufficient to wash the increased aliquot of expired carbon dioxide from the circuit. At other times a progressive response occurred as ventilatory stimulation as a result of the increased inspired carbon dioxide concentrations caused alveolar gas to reach the reservoir bag and converted the system behaviour from that of a simple added deadspace to that of a total mixing device. Whilst marked changes occurred commonly in both ventilation and inspired gas concentrations, only slight changes in end-tidal gas concentrations occurred. |
| قاعدة البيانات: |
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