Apple Watch Series 4
Apple Watch Series 4
AI-equipped Apple Watch Can Detect Irregular Heartbeat and Signs of a Stroke
The Apple Watch may become a useful tool in detecting an abnormal heartbeat, according to a study by heart rate app-maker Cardiogram and the UCSF Health lab. They determined that the wearable, when paired with neural network algorithms, is 97 percent accurate in detecting paroxysmal atrial fibrillation (AF), the most common type of heart rhythm problem. With further work, the Watch and other wearables might help prevent strokes in susceptible patients.
Apple has been pitching the Watch with ResearchKit to doctors and scientists as a serious health tool. Cardiogram initiated the research last year to figure out whether it could detect the signs of a stroke, a quarter of which are caused by irregular heartbeats.
The study drew 6,158 Apple Watch users via the Cardiogram app -- most had normal EKG readings, but 200 had an existing AF condition that made their hearts beat erratically. Engineers used those subjects to train a deep learning system to discern patients with arrhythmia vs. those with normal heartbeats.
They then tested the system on 51 patients scheduled for a procedure to restore normal heart rhythms. All used an Apple Watch and 12-lead ECG prior to and after the procedure. The AI algorithm and Apple Watch were able to identify AF with 97 percent accuracy and 98 percent sensitivity, according to the study.
The research holds a lot of promise, especially since the algorithm is just an early version and could easily be made more accurate. Two-thirds of strokes can be prevented with cheap drugs, but the onset of one is difficult to detect -- so doctors could save the lives of susceptible patients with just an off-the-shelf wearable.
The team plans to tweak the algorithm and validate it against "gold standard" EKG tests. It will then incorporate it into the Cardiogram app, and "investigate the ability to detect health conditions beyond atrial fibrillation," Cardiogram says. With that test a success, it could also push more hospitals and research groups onto ResearchKit and other wearables for patient monitoring and research.
- GPS
- Over 30% larger display and 50% louder speaker
- Electrical and optical heart sensors
- Digital Crown with haptic feedback
- 50% louder speaker
- S4 SiP with faster 64-bit dual-core processor
- Improved accelerometer and gyroscope for fall detection
Case Size : 40mm, 44mm
Display Area : 759 sq mm or 977 sq mm display area
Case Thickness : 10.7mm
Processor : 64-bit dual-core S4 processor; Up to 2x faster than S3 processor
Electrical Heart Sensor : Electrical heart sensor (ECG app); ECG app coming later this year
Optical Heart Sensor : Second-generation optical heart sensor
Technical Details
Apple Watch Series 4 (GPS)
Case Size
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40mm, 44mm
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Features
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GLONASS, Galileo, and QZSS, Barometric altimeter, Optical heart sensor, Electrical heart sensor, Improved accelerometer up to 32 g‑forces, Improved gyroscope, Ambient light sensor, LTPO OLED Retina display with Force Touch (1000 nits), Digital Crown with haptic feedback, Louder speaker, Ion-X strengthened glass, Sapphire crystal and ceramic back
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