Cox D, Tinloi S F, Farrimond J G
Intensive Therapy Unit, Royal Free Hospital, London, UK.
Intensive Care Med. 1988;14(5):532-7. doi: 10.1007/BF00263526.
We investigated six ventilator systems which were designed to allow spontaneous breathing. The time delay between initiation of inspiratory effort and the beginning of inspiratory gas flow was measured, as was the amount of negative (to ambient) pressure generated in the airway needed to produce the gas flow. We found that the flow-by program of the Puritan-Bennett 7200 caused minimal time delay and virtually no negative pressure was required to instigate gas flow. This should be contrasted with the other ventilator systems, which caused significant delay and inspiratory effort and hence increased work of breathing.
我们研究了六种旨在允许自主呼吸的通气系统。测量了吸气努力开始与吸气气流开始之间的时间延迟，以及产生气流所需气道中产生的（相对于环境的）负压量。我们发现，伟康7200的流速程序导致的时间延迟最小，并且几乎不需要负压来启动气流。这应与其他通气系统形成对比，其他系统会导致明显的延迟和吸气努力，从而增加呼吸功。
