Telemetry system of daily life motion and arrhythmia

An ambulatory electrocardiogram (ECG) recording system have been used to record cardiac arrhythmia in daily life. The system can continuously record the ECG waveform so that physicians could diagnose the cardiac disease, together with event recordings which can also provide the recording of activity of daily life (ADL), such as standing, walking, or eating. Patients, however, often forget to record the events. Our first approach to record ADL was AC-100 (GMS Co. Ltd.), which can record the zero-crossing count of three dimensional accelerometer outputs and RR intervals. We have been revised the instrument to make AC-4X, which can transmit an ECG signal, and acceleration wave signals. The signal received by the analyzing host computer is processed with finite impulse response (FIR) filters, and some other real-time filters. Also, the state transition charts and tables are used to recognize the output of filters. ECG signal is recognized by algorithm to indicate some types of arrhythmia, and acceleration signals are recognized to indicate some motion of daily life. The effort is on going to cover as many subjects as possible