If a small, simple heartbeat recorder, (i.e., a wearable monitoring device that is not as sophisticated or as expensive as a Holter heart monitor) could be attached to an individual, and the heartbeat timing information sent to a health center via the Internet, a significant public health benefit could be achieved. At the health center, sophisticated nonlinear computation could be performed for all the data derived from people connected to the center by such a device. This idea is important because more than 4 in 10 heart attacks (43%) go undiagnosed at the time they occur [1]. Such incidents often take people by surprise. Hence, continuous heartbeat monitoring would be an important technology.

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