- 學位論文
建構於無線感測器網路之不整脈監測系統
An Arrhythmia Monitoring System with Wireless Sensor Network
摘要
心臟疾病的診斷常使用心電圖作為輔助診斷的工具，但心律不整往往無法在一般心電圖檢查中察覺，隨身設備中常以霍特心電圖、事件（連續）記錄器及護心卡等長期監測心電圖。但除霍特心電圖外，上述設備均需由配戴者手動觸發記錄事件，研究指出即使已教導過如何操作，仍有23%的使用者不會正確使用事件記錄器，且這類儀器無法偵測無症狀之心律不整。 本研究主要目的在於建製一基於無線感測器網路之不整脈監測系統，對於生活固定於同一區域（如醫院、安養院）之對象，提供不整脈監測之功能，並將偵測結果即時回報。如此非但解決手動操作的不便，也實現心臟的即時照護。 系統架構上以模組化之硬體平台實現無線感測器網路節點與心電圖隨身裝置。心電圖隨身裝置將擷取之心電圖進行R波偵測與不整脈偵測，R波偵測演算法採用“So and Chan”以斜率變化方式偵測，以R-R interval與QRS面積作為參數判別PVC與APC之心律不整，發現異常心電圖時將心電圖訊號經由感測器網路回傳至看護端，供專業人員診視。 本研究初步實現一心電圖監測系統，並以MIT-BIH Arrhythmia Database進行測試，R波偵測靈敏度為95.13%，不整脈偵測靈敏度為57.95%。在實際測試後，在五次跳躍傳輸以下，傳輸15秒之心電圖約需10秒。
並列摘要
An electrocardiogram(ECG) is usually used for analyzing heart disease. However, for occasional arrhythmia event, it is not easy to detect during outpatient clinics. Holter monitor has been utilized for long term ECG monitoring. An Event (Loop) Recorder need to triggered by people for recording. In a study of 100 patients, 23% of patients who had symptoms failed to activate their loop recorder properly depite previous education and test transmissions. In this study, an Arrhythmia Monitoring System with Wireless Sensor Network is developed for people who active in an area (ex: hospitals). The system consists of three parts. The one is “ECG Device”, which can acquire and analysis the ECG signal. When potential arrhythmia event detected, it will transmit ECG signal. Another is “Base Station”, which acquire ECG signal and shown for medical staffs. The other is “Sensor Nodes”, which consist of wireless sensor network . It relay Data between ECG device and Base station. The system has been tested with 46 MIT-BIH Arrhythmia Database records. The sensitivity of QRS detection is 95.13%.The sensitivity of arrhythmia event detector is 57.95%. In the Transmission part, when data hops below 5 hops, it costs about 10 seconds for transmitting 15 seconds of ECG data.