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Computer Aided Patient Monitoring System

IP.com Disclosure Number: IPCOM000086177D
Original Publication Date: 1976-Aug-01
Included in the Prior Art Database: 2005-Mar-03
Document File: 2 page(s) / 14K

Publishing Venue

IBM

Related People

Cavanaugh, DJ: AUTHOR [+7]

Abstract

This system permits continuous noninvasive monitoring of the physiological status of a patient receiving dialysis treatment, to detect the onset and track the progress of hypovolemic shock.

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Computer Aided Patient Monitoring System

This system permits continuous noninvasive monitoring of the physiological status of a patient receiving dialysis treatment, to detect the onset and track the progress of hypovolemic shock.

The key elements in the system are a computer and transducers which continuously sense patient variables, such as blood pressure, heart rate and circulating blood volume. Computer logic is used to detect significant changes in these variables and to interpret the medical significance in various combinations of changes of variables, and to thus detect the physiological status of the patient with respect to hypovolemic shock.

The individual measurements of these variables and some of their changes may have no significance in a determination of the patient's physiological well being for they can vary with the patient's emotional status, activity level and other nonpertinent factors. A combination of the actual variables together with their changes is, however, quite important in the assessment of the physiological condition. A computer using both logic and memory is used to analyze the combination of these factors against a data base of characteristic patterns for various classes of patients or for the individual patient.

The system is especially suited to the detection of hypovolemic shock of a patient which may occur during a dialysis treatment. The common clinical criteria for hypovolemic shock is a precipitous fall in blood pressure. Measurement of blood pressure in the dialysis clinic is usually done manually at infrequent intervals.

Implementation of the method in the dialysis process will be with noninvasive monitoring techniques. Continuous noninvasive blood pressure measurement is not possible with today's technology, and even the intermittent measurements possible with a sphygmomanometer becomes erroneous if repeated at too frequent intervals due to reaction of the arterial vessel walls. However, in the dialysis environment an absolute pressure measurement is not required, for it is the rate of change which is important and this permits the use of an analog of blood pressure. A pressure sensor can be positioned over the patient's radial artery. The measured pressure will not be the true arterial pressure but will follow it and the sensor can be continuously monitored by the computer.

The heart rate can be measured with optical techniques, electrical techniques such as the R wave of an EKG, or through computer analysis of the measured pressure.

Blood volume changes can be measured in several ways. Electrical impedance of the patient's mu...