Dr Leslie Saxon wants to be able to measure anybody’s heartbeat, no matter where they are in the world.

The cardiologist, from the University of Southern California, specialises in the diagnosis and treatment of heart disease using wearable and implanted devices.

She believes that networked gadgets, such as an iPhone fitted with a heartrate monitor, could be the start of a revolution in healthcare that will allow your doctor to spot problems - and intervene – even if they are thousands of miles away.

She tells BBC Future about what this relatively inexpensive measure could mean for global health.

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