The proven health trackers saving thousands of lives
It was when Vic Gundotra's father suffered serious heart problems and nearly died that the former Google executive decided to move into healthcare tech.
He now runs a firm called AliveCor that has developed a heart-monitoring device causing excitement in medical circles.
AliveCor's recently launched Kardia Band, which integrates with Apple's smart watch, takes an electrocardiogram (ECG) of your heart, measuring its electrical activity as it pumps away.
Medical experts believe it could potentially save thousands of lives.
It can spot atrial fibrillation (AF) - one of the most common forms of abnormal heart rhythm and a major cause of stroke.
You place your thumb on the metal sensor in the watchband to complete an electrical circuit and it can take a reading in 30 seconds, sending the data to the watch over high-frequency audio rather than Bluetooth or wi-fi.
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