Desenvolvimento de um sistema de alarme inteligente para equipamentos de monitorização multiparamétrica de pacientes. / Development of an intelligent alarm system for patient multiparametric monitoring equipaments.

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

The objective of this work is the development of an Intelligent Alarm System architecture aiming at its application on a Multiparameter Patient Monitoring Equipment, which must be in compliance to international electrical medical equipment safety standards. This theme was raised during the project of a Multiparameter Patient Monitoring Equipment developed at Intermed Equipamento Médico Hospitalar Ltda. This architecture proposes a robust method for sensor fusion using a Kalman Filter as presented by Ebrahim, Feldman and Bar-Kana (1997), in which sensor measurements of heart rate are used to derive a predicted value for this parameter free of artifacts and more precise than any of the individual measurements. The patient vital signs are then, together with the predicted value of the heart rate, transformed into semantic variables and analyzed through fuzzy logic in order to identify alarm conditions. The proposed system is detailed for a clinic scenario, corresponding to a Cardiac Intensive Care Unit, where the main configuration parameters were obtained through interviews with health care professionals. The system development was focused on the compliance to International Standards at present day, which allow the use of Intelligent Alarm Systems since 2003. The system was simulated for the detailed clinic scenario with three patients in different cases. The simulations show the influence of a minimal grade of coincidence value for the validation of the alarm conditions, where we obtained good results using a value of 50%. At the end of this work, it is shown the importance of considering the alarm priority, which not only is a standard requirement, but also interferes directly on the system behavior, and consequently, on the operator´s expected response to the message.

ASSUNTO(S)

biomedic engineering expert sytems filtros de kalman biomedic signals kalman filters fuzzy sistemas especialistas fuzzy sinais biomédicos engenharia biomédia

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