Sifeddine S, Badaoui R, Hassi N, Taoudi M B, Ossart M
CHG de Compiègne, Département d'Anesthésie-Réanimation.
Cah Anesthesiol. 1994;42(5):583-7.
Early use of magnetic resonance imaging (MRI) excluded patients needing mechanical ventilation. However magnetic resonance imaging is an innocuous investigation and affords important elements to the diagnosis of many pathologies. Improvement of anaesthetic equipment have led to enlarge MRI applications considerably. Ventilations situated outside the MRI room required very long tubing, to 9-11 m. Although the ferromagnetic charge of presently used ventilators is greatly reduced, it is still necessary to keep them at some distance from the patient, with tubing of about 3 m, even in children. Therefore the compressible gas volumes are larger than the usual ones. For a tube length of 3 m, about 2-3 ml.kg-1 should be added to the standard tidal volume (10 ml.kg-1), so as to obtain safe normoventilation.
早期使用磁共振成像（MRI）排除了需要机械通气的患者。然而，磁共振成像是一种无害的检查方法，可为许多疾病的诊断提供重要依据。麻醉设备的改进使得MRI的应用范围大大扩大。位于MRI室外部的通气装置需要很长的管道，长达9至11米。尽管目前使用的呼吸机的铁磁性负荷已大大降低，但即使在儿童患者中，仍需将其与患者保持一定距离，使用约3米长的管道。因此，可压缩气体体积比通常的要大。对于3米长的管道，应在标准潮气量（10 ml.kg-1）的基础上增加约2-3 ml.kg-1，以实现安全的正常通气。
