Blood pressure control during anaesthesia with and without transport delay

Abstract

Regular monitoring of the anaesthetic drug dosage during a surgery is required to avoid the patient’s inter operative awareness due to inadequate levels of anaesthesia. The traditional methods of assessing the anaesthetic depth levels such as heart rate, blood pressure, pupil size, sweating, etc are not very accurate as these responses may differ from patient to patient depending on the type of surgery and the anaesthetic drug administered. Sometimes during the process of anesthesia some time delay may occurs and this time delay is very dangerous for our life during anesthesia. In this paper Transport delay that comes in the process of annesthesia have investigated and analysed. Z-Transform have been shown its incapability for fractional time delay processes. So, Modified Z-Transform is preffered for fractional time delay processes. Further effect of this time lag (Transportation delay) on system performance is minimized with PID controller. Relative, absolute stability have been calculated through which blood pressure is effectivly controlled during annesthesia.