Christensen K N, Jensen J K
Acta Anaesthesiol Scand. 1979 Oct;23(5):419-21. doi: 10.1111/j.1399-6576.1979.tb01469.x.
A modified Mapleson D circuit has been used in connection with a Cameco anaesthetic ventilator during neuroradiological procedures in general anaesthesia. In order to increase mobility of the patient, two or three lengths of corrugated rubber tubing were used to connect the patient to the ventilator. Blood gas analysis was carried out in 20 patients after ventilation to steady state with both circuits. The respiratory minute volume and fresh gas flow were preset in Bain's (Bain & Spoerel 1975) predictions. No significant difference could be detected in respect to Paco2 or Po2, whether 2 or 3 lengths of tubing were used. Mean values of Paco2 were higher compared with the results of Bain (0.37 kPa s.d. 0.50). It is concluded that this system gives maximum mobility of the patient during the radiological procedure and offers reliable adjustment of Paco2, even in patients with apparent increase of intracranial pressure.
一种改良的Mapleson D回路已与卡姆科麻醉呼吸机一起用于全身麻醉下的神经放射学检查过程中。为了增加患者的活动灵活性，使用了两或三段波纹橡胶管将患者与呼吸机相连。在使用这两种回路通气至稳态后，对20名患者进行了血气分析。呼吸分钟通气量和新鲜气体流量根据贝恩（Bain & Spoerel，1975年）的预测进行预设。无论使用两段还是三段管道，在动脉血二氧化碳分压（Paco2）或动脉血氧分压（Po2）方面均未检测到显著差异。与贝恩的结果相比，Paco2的平均值更高（标准差为0.50，均值为0.37千帕）。得出的结论是，该系统在放射学检查过程中能使患者获得最大的活动灵活性，并且即使在颅内压明显升高的患者中也能可靠地调节Paco2。
