| 摘要 |
An improved system for making an accurate determination of the patient's compliance and airway resistance by ensuring that the flow to and/or from the patient at the end of a ventilator pause is, in fact, reduced to zero flow. The normal ventilator pause occurs at the end of an inspiratory cycle where the ventilator terminates the breathing air delivery to the patient and then enters a pause period. Values are taken for the airway flow and pressure at the beginning of the pause period, that is at peak pressure, and a second set of readings is taken at the end of the pause period, called the plateau pressure. This second set of readings greatly simplifies solving the equations for patient resistance and compliance if the flow at that time is assumed to be zero. The present system monitors the flow at the end of the pause period and continually adjusts the circuit pressure in order to drive the flow at the end of the pause period to a zero flow value, thus improving the accuracy of the patient resistance and compliance calculation and achieving a more ideal pause pressure profile.
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