Key result
Apple Watch Series 8 shows excellent correlation with 12-lead ECG for resting heart rate and intervals.
Why the study?
The Apple Watch has recently been used to measure heart electricity via 30 seconds of ECG monitoring, but its validity is not known.
Does the Apple Watch accurately measure resting ECG parameters (HR, PR, QT, QRS, RR) compared to a standard 12-lead ECG in patients with cardiac and chronic diseases?
Cross-Sectional (n=112)
No
Does the Apple Watch accurately measure resting ECG parameters (HR, PR, QT, QRS, RR) compared to a standard 12-lead ECG in patients with cardiac and chronic diseases?
The Apple Watch Series 8 provides highly accurate 30-second resting ECG measurements (HR, PR, QRS, QT, RR) compared to a standard 12-lead ECG in patients with cardiac and chronic diseases.
Answers are grounded in this paper and cite their sources.
Supports Apple Watch accuracy for resting intervals in cardiac patients; leaves open prospective validation before clinical adoption.
Background: Electrocardiography (ECG) is a standard method for studying the heart rate and heart electricity. The Apple Watch has recently been used to measure heart electricity via 30 seconds of ECG monitoring, but its validity is not known. Methods: A cross-sectional study included a sample of 112 patients with chronic disorders, including cardiac patients with sinus rhythm, cardiac patients with irregular heart rhythm, and patients with diabetes, hypertension, and dyslipidemia; their cardiac activity was investigated using the Apple Watch and ECG. Results: The correlations were strong between the Apple Watch and the 12-lead ECG in the heart rate, PR intervals, QT intervals, QRS complex, and RR intervals in all patients' subcategories (cardiac, hypertension, diabetic, and dyslipidemia patients). Conclusion: The Apple Watch is valid for carrying out ECG in measuring the heart rate, PR intervals, QT intervals, QRS complex, and RR intervals of patients with cardiac and chronic diseases at rest; this may help in initial diagnosis for patients with cardiac diseases or those who are at risk of developing cardiac disease in the future.
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Khushhal et al. (2025) conducted a cross-sectional in Cardiac diseases and chronic comorbidities (hypertension, diabetes, dyslipidemia) (n=112). Apple Watch Series 8 (30-second resting ECG) vs. 12-lead ECG was evaluated on Intraclass correlation coefficient (ICC) for heart rate and ECG intervals (PR, QRS, QT, RR) (ICC 0.99 to 1.00, p=<0.001). The Apple Watch Series 8 demonstrated excellent correlation (ICC 0.99 to 1.00) with a standard 12-lead ECG for measuring heart rate, PR, QRS, QT, and RR intervals at rest.
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