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A master thesis from Aalborg University

Blodsukker regulerende beslutningsstøtte system

[Decision Support for treatment of critically ill patients in intensive care]

Author(s)

Term

4. term

Education

Publication year

2008

Submitted on

2008-05-30

Pages

138 pages

Abstract

Background: Hyperglycaemia is prevalent in critically ill patients and can increase mortality. This report presents and validates a glycaemic control system using a physiologically based metabolic control model (Glucosafe) and an associated integral based parameter identification method. The intended application for this glycaemic control system, and the associated model and parameter identification method is glycaemic control of critically ill patients. Methods: The glycaemic control system uses the Glucosafe glucose-insulin metabolic model. Time varying insulin sensivity, SI , is determined between measurements using an integral-based method. The glycaemic control system is validated by its ability to keep patients in a normoglycaemic range (4.4-7.75 mmol/L). Clinical control interventions are determined by optimization over a series of penalty functions. The system is validated against 20 virtual patients by using patient specific insulin sensivity profiles based on clinical data from 20 critical care patients at Christchurch Hospital (New Zealand). Results: The overall median blood glucose concentration for all 20 patients is 6.05 mmol/L, and the IQR is 5.54-6.62 mmol/L. The overall number of hypoglycaemic measurements per patient is 0 (blood glucose measurements below 2.2 mmol/L). The overall mean percent of measurements inside the normoglycaemic range (4.4-7.75 mmol/L) is 87.7 %. Conclusions: The results for the glycaemic control validation presented are comparable to other similar studies by Chase et al. (2008) and are acceptable for later use in clinical pilot trials.

Baggrund: Hyperglykemi er udbredt i kritisk syge patienter og kan øge dødeligheden. Dette Rapporten præsenterer og validerer en glykæmisk kontrol system ved hjælp af en fysiologisk baseret metabolisk kontrol model (Glucosafe) og en tilhørende integrerende baseret parameter identifikation metode. Den påtænkte anvendelse for denne glykæmisk kontrol system, og de associerede model og parameter identifikation metode er glykæmisk kontrol af kritisk syge patienter. Metoder: Den glykæmiske kontrolsystem bruger Glucosafe glucose-insulin metabolisk model. Time varierende insulin sensivity, SI, afgøres mellem målinger ved hjælp af en integrerende-baseret metode. Den glykæmiske kontrol Systemet er valideret af sin evne til at holde patienterne i en normoglycaemic interval (4.4-7.75 mmol / L). Klinisk kontrol interventioner er fastlagt ved optimering over en række straf funktioner. Systemet er valideret mod 20 virtuelle patienter ved at bruge patientens specifikke insulin sensivity profiler baseret på kliniske data fra 20 kritiske pleje patienter i Christchurch Hospital (New Zealand). Resultater: Det samlede median blodsukker koncentration for alle 20 patienter er 6,05 mmol / L, og Det IQR er 5.54-6.62 mmol / L. Det samlede antal af hypoglykæmiske målinger per patient er 0 (blodsukker målinger under 2,2 mmol / L). Den samlede gennemsnitlige procent af målinger inde Det normoglycaemic interval (4.4-7.75 mmol / L) er 87,7%. Konklusioner: Resultaterne for den glykæmiske kontrol validering præsenteret er sammenlignelige til andre lignende undersøgelser fra Chase et al. (2008) og er acceptabel til senere brug i kliniske pilot forsøg.

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