Measuring Your ECG on the Apple Watch Series 4

The ECG app on the Apple Watch Series 4 is the first direct-to-consumer product that allows recording an electrocardiogram directly from the wrist. Using this app, you can capture your heart rhythm as soon as you experience symptoms of a rapid heart beat or a skipped beat. Using this app can provide important information to your physician or health care provider. Apple worked closely with the FDA to get clearance for the ECG app. The ECG app is not intended for use by people under the age of 22, and the Atrial Fibrillation detection of the ECG app should not be used by anyone who has already been diagnosed with Atrial Fibrillation.

The Apple Watch Series 4 has one electrode for the ECG on the back of the watch, and a second electrode on the Digital Crown. To record an ECG, run the ECG app on the Apple Watch, and hold your finger on the Digital Crown for 30 seconds.

The first time that you run the ECG app on the Apple Watch, you will be prompted to run the Health app on the iPhone in order to set up the ECG. You will be asked to enter your Date of Birth, and then you will be given some explanations about the ECG app and its usage. Once you have completed the initial setup, you are ready to record your ECG.

Recording an ECG on the Apple Watch Series 4

In order to record an ECG, run the ECG app on your Apple Watch, rest your arms on a table, or in your lap, and hold your finger on the Digital Crown for 30 seconds while the ECG is being recorded.

In order to get the most accurate ECG, your Apple Watch needs to be snug on your wrist. While the ECG is being recorded, it will be displayed in real-time on the Apple Watch.

Once the ECG recording is completed (after 30 seconds), your ECG will be analyzed and the watch will display the results of the analysis. It will show the average heart rate of the ECG, and it will show one of four possible results:

Sinus Rhythm

A sinus rhythm result means the heart is beating in a uniform pattern.

Atrial Fibrillation (AFib)

An AFib result means the heart is beating in an irregular patter. AFib is the most common form of serious arrhythmia.

Low or High Heart Rate

A heart rate under 50 BPM or over 120 BPS affects the ECG app’s ability to check for AFib and the recording is considered inconclusive.

Inconclusive

An inconclusive result means the recording can’t be classified. This can happen for many reasons such as not resting your arms on a table during a recording or your Apple Watch is too loose.

In order to view the ECG on the iPhone, run the Health app, and select Health Data at the bottom of the screen. Then choose the Heart category. Scroll down until you see Electrocardiogram (ECG) and tap on it to get to the Electrocardiogram (ECG) screen. On the Electrocardiogram (ECG) screen, you will see the three most recent ECGs that you recorded. You can see a list of all the ECGs by selecting All Data.

Alternatively, you can see the ECGs grouped by their results. You can select Sinus Rhythm, Atrial Fibrillation, Low and High Heart Rate, or Inconclusive. Tapping on any of those labels will show you a list of all the ECGs in that category.

In the list of ECGs, you will see each ECG and the result of the ECG analysis – Sinus Rhythm, Atrial Fibrillation, Low and High Heart Rate, or Inconclusive. In addition, you’ll see the time and date, the average heart rate and part of the ECG itself.

Tap on any individual ECG to view the full details for that ECG recording. On the ECG Detail screen you will see the full ECG. You can see the complete 30 second ECG recording by swiping right or left on the ECG itself. Scroll down to see additional information about that ECG. This includes the Start Time and End Time of the ECG, as well of the details about the source of the ECG.

Exporting the ECG

From the ECG Detail screen, you can export the ECG. This can be done in one of two ways. You can tap the Share button in the upper right corner, or tap the label Export a PDF for Your Doctor. In either case you get the standard options for sharing the ECG, and from there you can choose to email the ECG. The ECG will be sent as a PDF file. This PDF will have the ECG waveform itself, your name and date of birth, the time of the ECG and the results of the ECG analysis. Below the waveform, are additional details about the ECG.

Conclusion

The ECG feature of the Apple Watch Series 4 is one of the most important features that has been added to the Apple Watch, and will revolutionize the use of the Apple Watch as a life saving health accessory. If you don’t have an Apple Watch Series 4, the ECG feature might just be the reason to get one now, either for yourself, or for a loved one.