Extraction of ECG, EGG and respiratory signal from single composite abdominal signal
Date Issued
2009
Date
2009
Author(s)
Chiu, Shao-Yu
Abstract
The lack of integrated bio-signal detection instruments made monitor patients’ multiple physiology parameters rather complicated in the past. Many electrodes need be applied to the body surface at the same time. Those recording devices may have interference with by each other. In addition, patients at home may have sudden attack of discomfort, an easy implemented device that can record a variety of essential physiological signals through simple operation will be extremely helpful. These signals can also be transferred through the network to health care specialists.or above purposes, we implemented a portable device using few electrodes on abdominal wall to measure various patients’ electrophysiology signals simultaneously. The signals were acquisited through three electrodes placed on abdomen wall and were separated into Electrocardiogram (ECG), Electrogastrogram (EGG) and respiratory rhythm according to their individual rhythmic characters. n this thesis, it set up a combinatory ECG, EGG and respiratory signal system which includes the hardware for data acquisition and storage. In ECG signal processing, dynamic window with the baseline wandering fitting algorithm was noted to solve the drifting problem caused by respiration. The validation of our combinatory monitoring system was verified by synchronous recording using commercial available individual system. Good ECG correlation was demonstrated in 17 subjects in a long duration (1 hour) or short time (5 minutes) analysis. In EGG signal processing, a special designed electrode was used to ensure simultaneously recording. In a 10 subjects study, a long duration (1 hour) or short time(20 minutes) analysis are both show good correlation. The respiratory signal component was verified by twice down-sampling processing and the usage of twice filtering. A good respiratory signal correlation was demonstrated in 10 subjects.n brief. We had set up a system which can accurately record three sets of physiological signals with three electrodes on upper abdomen. High frequency high amplitude ECG signals and low frequency low amplitude ECG signals in accompany with respiratory movement signal can be simultaneously recorded. The mixed tracing can then be separated according to their characteristics. This simple design is very user friendly and can be applied to ambulatory physiological monitoring especially for the purpose of symptom correlation.
Subjects
ECG
EGG
Respiratory Signal
Baseline wandering fitting
Digital Filtering
Type
thesis
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