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Due to the recent active research activities in the area of wireless sensor networks (WSN), the development and realization of a light-weighted, low-cost and wireless electrocardiogram (ECG) monitor has become feasible. In this paper, we propose an ECG monitor design based on a commercially available WSN device. The device utilizes 868 MHz ISM license free frequency band and operates on TinyOS operating system. The ECG signal from patients is detected and radioed to a PC for monitoring. This paper validates our approach and suggests the feasibility of future enhancements.