On-line Non-invasive Determination of Patients and Ventilator Respiratory Work during Proportional Assist Ventilation
The ventilator is a type of clinical life support apparatus which can help patients to enhance lung ventilation and accelerate metabolization.Proportional Assist Ventilation (PAV) is proposed with the concept of proportionally amplifying patients breathing effort.Knowing the patient component and ventilator component of work can help the physician to adjust the proportion of support by the ventilator and improve the patient s therapeutic effect.According to the definition of the work,an algorithm that estimates the patient and ventilator work components of proportional assist ventilated patients is presented. The integral result of the product of pressure and flow in the inspiratory period is the work.The algorithm requires estimating the patients airway resistance(R)and elastance(E).The controlled mechanical ventilation method,the least squares method and the physiological method are analysed.Their deficiencies are pointed and an improved physiological method is used ultimately to estimate R and E.The algorithm and the estimate of E and R require the continuous measurement of inspiratory airflow rate and mouth pressure and it is suitable to be incorporated in ventilators for on-line non-invasive determination of the patient and the ventilator contributions to the total work of breathing.Test results of our mechanical ventilator Shangrila590 and active servo lung ASL5000 are also reported for the algorithm and show that the proposed algorithm is non-invasive and can be used in ventilators for continuous on- line determination of work component.
Yi Weiwei Zhang Qi Wang Yueke Qin Haiyan
Mechatronic and Automation School National University of Defense Technology Changsha,Hunan Province,China
国际会议
2008 IEEE International Conference on Onformation and Automation(IEEE 信息与自动化国际会议)
张家界
英文
1163-1167
2008-06-20（万方平台首次上网日期，不代表论文的发表时间）