The ECG app uses the electrical heart sensor built into the Digital Crown and the back crystal to record a single-lead ECG similar to a Lead I ECG. This real-world data can enable you to make more informed and timely decisions regarding further evaluation and care. With the ECG app, patients who experience symptoms such as rapid or skipped heartbeat, or receive the irregular rhythm notification, can capture an ECG and record their symptoms. Learn more about irregular rhythm notifications The irregular rhythm notification feature received 510(k) clearance from the FDA for users 22 years and older with no prior history of AFib. In a clinical study using an FDA‑cleared patch ECG as a reference device, the irregular rhythm notification feature demonstrated a sensitivity of 88.6% and a detection specificity of 99.3%. If the algorithm repeatedly detects an irregular rhythm suggestive of AFib, your patient will receive a notification and the date, time, and beat‑to‑beat heart rate will be recorded in the Health app. Irregular rhythm notifications use the optical heart sensor to detect the pulse wave at the wrist and look for variability in beat‑to‑beat intervals when the user is at rest. This feature won’t detect all instances of AFib, but may catch something that can provide your patients with an early indication that further evaluation may be warranted. Real world use of the ECG app may result in a greater number of strips being deemed inconclusive and not classifiable.The irregular rhythm notification occasionally checks for signs of irregular rhythms that may be suggestive of atrial fibrillation (AFib). The clinical validation results reflect use in a controlled environment. The ability of the ECG app to accurately classify an ECG recording into AFib and sinus rhythm was tested in a clinical trial of approximately 600 subjects, and demonstrated 99.6% specificity with respect to sinus rhythm classification and 98.3% sensitivity for AFib classification for the classifiable results. In studies comparing the ECG app on Apple Watch to a standard 12-lead ECG taken at the same time, there was agreement between the ECG app classification of the rhythm as sinus or AFib compared to the standard 12-lead ECG. Single-lead ECGs are often prescribed by doctors for people to wear at home or within the hospital so that the doctor can get a better look at the underlying rate and rhythm of the heart. However, the ECG app on Apple Watch Series 4, Series 5, Series 6, or Series 7 allows you to generate an ECG similar to a single-lead ECG without a prescription from your doctor. However, a single-lead ECG cannot be used to identify some other conditions, like heart attacks. The ECG app on Apple Watch measures a waveform similar to one of those twelve waveforms. A single-lead ECG is able to provide information about heart rate and heart rhythm and enables classification of AFib. This 12-lead ECG records electrical signals from different angles in the heart to produce twelve different waveforms. In a doctor’s office, a standard 12-lead ECG is usually taken. The ECG app on Apple Watch Series 4, Series 5, Series 6, Series 7, Series 8, or Ultra generates an ECG that is similar to a single-lead (or Lead I) ECG. To ensure the best reading after swimming, showering, heavy perspiration, or washing your hands, clean and dry your Apple Watch. It may take one hour or more for your Apple Watch to completely dry. Make sure that your wrist and hands are thoroughly dry before attempting a reading. Use of the ECG app may be impacted if the Apple Watch and/or skin aren't entirely dry. Liquid-free contact is required for the ECG app to work properly. Move away from any electronics that are plugged into an outlet to avoid electrical interference.Ī small percentage of people may have certain physiological conditions preventing the creation of enough signal to produce a good recording - for example, the positioning of the heart in the chest can change the electrical signal levels, which could impact the ECG app’s ability to obtain a measurement.Make sure that your Apple Watch is on the wrist that you selected in the Apple Watch app. To check, open the Apple Watch app, tap the My Watch tab, then go to General > Watch Orientation.Make sure that your wrist and your Apple Watch are clean and dry.The band should be snug, and the back of your Apple Watch needs to be touching your wrist. Make sure that your Apple Watch isn’t loose on your wrist.Rest your arms on a table or in your lap while you take a recording.
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