On-line Remote EKG as a Web Service
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A 3-leads, non-diagnostic EKG has a role in emergency rescue and homecare. In this paper we introduce the design and a prototype of a service, provided to a doctor and a patient, for the on-line remote visualization of patient's 3-leads EKG. The architecture is based on the HTTP protocol, using commercial off-the-shelf devices to implement the sensor on patient's side, a browser on a laptop PC on the doctor's side as viewer, and a cloud container to connect the two using Websockets. A prototype is built to evaluate signal latency, power consumption of the patient side device, and the quality of the rendering. After some experiments, latency is measured below 1sec, and power consumption is estimated in the 2A*3.3V range; visualization is comparable to commercial, non-diagnostic products. The prototype patient device is portable, and can be operated using rechargeable battery packs. Its cost is below 100, and all the required equipment is commercially available. The architecture is ready for on field evaluation, and we indicate how to improve power consumption while reducing cost.
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