How accurate are smartwatches in detecting Afib?

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Several smartwatches claim to be able to detect atrial fibrillation in wearers. But how accurate are they?

That was the focus of an October meta-analysis in JACC: Advances that reviewed 28 studies spanning 17,349 patients. Here is where the devices ranked for accuracy:

Sensitivity

1. Amazfit: 99%

2. Seiko Epson PWM: 98%

3 (tie). Garmin Forerunner: 97%

3 (tie). Samsung: 97%

5. Apple Watch: 94%

6. Withings ScanWatch: 89%

7. Fitbit: 66%

Specificity

1. Amazfit: 99%

2. Garmin Forerunner: 98%

3. Apple Watch: 97%

4. Samsung: 96%

5. Withings ScanWatch: 95%

6. Seiko Epson PWM: 91%

7. Fitbit: 79%

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