What Sinus Rhythm Looks Like on Your Watch ECG

Sinus Rhythm ECG
Qaly Heart
Qaly is built by Stanford engineers and cardiologists, including Dr. Marco Perez, a Stanford Associate Professor of Medicine, Stanford Cardiac Electrophysiologist, and Co-PI of the Apple Heart Study.

Key Takeaways

  • Tell-tale signs of Sinus Rhythm include a regular heart rhythm, a heart rate between 60 and 100 beats-per-minute, normal P waves, a normal PR interval, and a normal QRS complex.
  • Sinus Rhythm is the rhythm of a healthy heart and isn't a cause for concern.
  • If you're in Sinus Rhythm, you're staying heart healthy.

Got other questions on Sinus Rhythm? See the Qaly guides on Sinus Rhythm:

Introduction

Hello, heart hero. In your quest to identify that irregular heart rhythm you just felt, you may have come across the term Normal Sinus Rhythm, or Sinus Rhythm. With your trusty watch ECG now in hand, you may be wondering, "What does Sinus Rhythm look like on my watch ECG?" In this guide, we'll help you see Sinus Rhythm on your watch ECG. Let's dive in.

What's Sinus Rhythm?

Before trying to identify Sinus Rhythm on your ECG, it's helpful to remind yourself what Sinus Rhythm actually is. (If you're confident in your Sinus Rhythm knowledge, though, skip on ahead to the next section for some visual examples of a Sinus Rhythm ECG).

To start, remember how your heart beats? It produces an electrical signal, which squeezes and unsqueezes your heart, which in turn pumps your blood to your lungs for oxygen and then out to the rest of your body.

With Sinus Rhythm, that electrical signal is produced completely normally and correctly by your heart's "sinus node." You can think of your heart's sinus node as your heart's natural pacemaker.

Sinus Rhythm is the rhythm of a normal, healthy heart. It means the electrical pulse generated by your heart's sinus node moves properly through the rest of your heart, causing it to squeeze and unsqueeze smoothly and healthily.

So What Does Sinus Rhythm Look Like on My Watch ECG?

To identify Sinus Rhythm on your ECG, look for these tell-tale signs:

  • A heart rate between 60 and 100 beats-per-minute (bpm).
  • A regular R-R interval, or the distance between the peaks of your QRS complexes.
  • A normal P wave, that comes immediately before your QRS complex.
  • A normal PR interval, which is normally between 0.12 and 0.20 seconds long.
  • A normal QRS complex, which is normally between 0.08 and 0.12 seconds long.

For visual examples, take a look at Sinus Rhythm seen on Qaly members' watch ECGs.

Here's Sinus Rhythm on a Qaly member's Apple Watch ECG. Notice the regular R-R interval, the normal and visible P waves that come immediately before the normal QRS complexes, and a heart rate that isn't too fast or too slow.
Here's Sinus Rhythm on a Qaly member's Apple Watch ECG. Notice the regular R-R interval, the normal and visible P waves that come immediately before the normal QRS complexes, and a heart rate that isn't too fast or too slow.

Here's Sinus Rhythm on a Qaly member's KardiaMobile ECG. Again here, notice the regular R-R interval, the normal and visible P waves that come immediately before the normal QRS complexes, and a heart rate that isn't too fast or too slow.
Here's Sinus Rhythm on a Qaly member's KardiaMobile ECG. Again here, notice the regular R-R interval, the normal and visible P waves that come immediately before the normal QRS complexes, and a heart rate that isn't too fast or too slow.

Get your ECG checked by certified experts within minutes on the Qaly app.

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Here's Sinus Rhythm on a Qaly member's Apple Watch ECG and interpreted by cardiographic technicians on the Qaly app. Beyond the regular R-R interval, notice that the PR interval is 0.183 seconds and the QRS complex is 0.082 seconds, both within normal ranges.
Here's Sinus Rhythm on a Qaly member's Apple Watch ECG and interpreted by cardiographic technicians on the Qaly app. Beyond the regular R-R interval, notice that the PR interval is 0.183 seconds and the QRS complex is 0.082 seconds, both within normal ranges.

What's the Difference Between Sinus Rhythm and Heart Rate?

Your heart rate is the number of times your heart beats per minute. A resting heart rate of 60 to 100 bpm is considered normal for most people, although athletes or people who stay fit with frequent exercise can see a lower resting heart rate in the 40s and 50s.

Sinus rhythm, on the other hand, refers to your heart rhythm. Your heart rhythm is the pattern of how your heart beats, beyond simply your heart rate. Your heart rhythm includes other clues, like your PR interval, your QRS interval, your QT interval, and the presence of irregular heartbeats or ectopic beats.

Is Sinus Rhythm a Cause for Concern?

Not at all. Sinus Rhythm means your heart is functioning properly and healthily 🙂

Conclusion

Well, that just about wraps up our guide on what Sinus Rhythm looks like on your watch ECG. We hope this could be of some help to you.

If you still need help interpreting your ECGs, don't worry, we understand how scary and confusing it can be to experience irregular heartbeats. That's why we created the Qaly app for you and for the hundreds of millions of people around the world who live with heart palpitations and abnormal heart rhythms. On the Qaly app, human experts will interpret your ECGs within minutes for clarity and peace of mind.

To get started with the Qaly app for free, grab the Qaly app from the App Store or Play Store today. If you have any more questions, or if you need our help in any other way, don't hesitate to reach out to us at support@qaly.co.

As always from the team at Qaly, stay heart healthy ❤️

Wondering if it's Sinus Rhythm? On the Qaly app, human experts will interpret your ECGs for Sinus Rhythm within minutes. Get started for free today.

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Wondering if it's Sinus Rhythm? On the Qaly app, human experts will interpret your ECGs for Sinus Rhythm within minutes. Get started for free today.

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