Woo P, Eurenius S
Ann Otol Rhinol Laryngol. 1982 Nov-Dec;91(6 Pt 1):615-21. doi: 10.1177/000348948209100621.
Venturi jet ventilation with the oxygen injector needle placed within the lumen of the laryngoscope was studied systematically in two dogs undergoing repeated general anesthesia suspension laryngoscopy. Using a total body plethysmograph, the effect of changes of needle angle, position and its effect on tidal volume delivery were measured. The changes of pressure regulator, flow rate and needle size were correlated with the volume delivery. Intratracheal pressure during Venturi ventilation was measured. Correlation of arterial blood gases and minute ventilation with the system was done. While ventilatory capacity is able to be achieved predictably, there are many variables. Optimal placement of the needle tip for maximum safety and efficiency appears to be at the midthird or lower third of the laryngoscope. It is important to center the needle axis to the laryngoscope axis. Other parameters subject to choice are the selection of needle size, regulator pressure setting and flow rate setting. By first selecting the correct needle size that will hyperinflate the subject, the pressure regulator can then be reduced to achieve ventilatory volumes similar to spontaneous tidal volumes. In prolonged use, the Venturi system was able to provide excellent ventilation safely and predictably.
在两只接受反复全身麻醉下喉镜检查的犬中，系统研究了将氧气注入针置于喉镜管腔内的文丘里喷射通气。使用全身体积描记器，测量了针角度、位置的变化及其对潮气量输送的影响。压力调节器、流速和针尺寸的变化与气量输送相关。测量了文丘里通气期间的气管内压力。对该系统的动脉血气和分钟通气进行了相关性分析。虽然通气能力能够可预测地实现，但存在许多变量。为了实现最大安全性和效率，针尖端的最佳放置位置似乎在喉镜的中三分之一或下三分之一处。将针轴与喉镜轴对中很重要。其他可供选择的参数包括针尺寸的选择、调节器压力设置和流速设置。通过首先选择能使受试者过度充气的正确针尺寸，然后可以降低压力调节器以实现与自主潮气量相似的通气量。在长期使用中，文丘里系统能够安全且可预测地提供良好的通气。
