Apple Adds Electrodes to Turn Watch into Electrocardiograph

Grab the Apple Watch’s stem and record an ECG in 30 seconds

2 min read
Jeff Williams, chief operating officer of Apple Inc., speaks about the Apple Watch during an event at the Steve Jobs Theater in Cupertino, California, U.S., on Wednesday, Sept. 12, 2018.
Photo: David Paul Morris/Bloomberg/Getty Images

Apple’s original Watch shipped with two optical heart rate sensors, mainly for tracking the wearer's heart rate during exercise. Later models added resting heart rate monitoring and alerts, but the device was still basically intended for use with fitness applications. A year ago, the company dipped a wrist into the medical pool, launching a study with Stanford to use the sensors to collect data on irregular heart rhythms and notify users who might be having episodes of atrial fibrillation, suggesting they contact their doctors for follow-up tests—like an electrocardiogram (ECG).

Today, Apple announced that it is building the ability to generate ECGs into its watch. The new Apple Watch Series 4 includes electrodes on the back of the watch (where it touches the wrist) and on the watch stem. To take an ECG, the person wearing the watch launches the app, then touches the watch stem with a finger for 30 seconds. (Putting one of the electrodes on the stem addresses one challenge wearable electrocardiographs have wrestled with—electrodes that are too close together don’t get a good signal.)

The watch then displays its interpretation of the ECG—either a normal rhythm or atrial fibrillation; the full ECG (those tracings we’re familiar with) can be stored as a PDF on the user’s iPhone and sent to a doctor for further interpretation. The device, reported Apple’s Chief Operating Officer Jeff Williams, is certified by the U.S. Food and Drug Administration (FDA); he said that it’s the first certified ECG monitor to be sold over the counter, directly to consumers.

Williams brought American Heart Association president Ivor Benjamin to the stage for an endorsement. Benjamin said, “Capturing heart rate data in real time is changing way we practice medicine. People often report symptoms that are absent during medical visits. The ability to access health data on demand is game changing.”

Apple’s Series 4 Watches with built-in ECG capability will sell from US $399 to $499, depending on other features.

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