What Sinus Bradycardia Looks Like on Your Watch ECG

Sinus Bradycardia 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

  • Sinus Bradycardia is a heart rhythm where the electrical signal from your heart's sinus node occurs less than 60 times per minute, resulting in a heart rate below 60 beats per minute (bpm). A normal heart rate typically falls within 60-100 bpm.
  • To recognize Sinus Bradycardia on your watch ECG, look for normal and constant P waves and PR intervals, along with a heart rate below 60 bpm and a regular heart rhythm.
  • Sinus Bradycardia is often normal, especially in young athletes or during sleep with a resting heart rate of 40-60 bpm. However, it can also be caused by medications like beta-blockers or calcium channel blockers, electrolyte imbalances, aging-related scarring of the sinus node, thyroid disorders, or sleep apnea. If you're experiencing signs of Sinus Bradycardia, consult a healthcare provider to rule out any harmful underlying conditions.

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

Introduction

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

What's Sinus Bradycardia?

Before trying to identify Sinus Bradycardia on your ECG, it's helpful to remind yourself what Sinus Bradycardia actually is. (If you're confident in your Sinus Bradycardia knowledge, though, skip on ahead to the next section for some visual examples of a Sinus Bradycardia 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 Bradycardia, that electrical signal is produced from your heart's "sinus node" as it should be. You can think of your heart's sinus node as your heart's natural pacemaker.

But with Sinus Bradycardia, that electrical impulse from your sinus node is happening less than 60 times per minute, or in other words, at a heart rate of less than 60 beats-per-minute (bpm).

A normal heart rate typically falls within 60-100 bpm.

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

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

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

Here's Sinus Bradycardia caught on a Qaly member's Apple Watch ECG. Note the regular rhythm, the heart rate below 60 bpm, and the normal PR Interval.
Here's Sinus Bradycardia caught on a Qaly member's Apple Watch ECG. Note the regular rhythm, the heart rate below 60 bpm, and the normal PR Interval.

Here's Sinus Bradycardia caught on a Qaly member's Apple Watch ECG. Notice here, too, this ECG shows a heart rate below 60 bpm.
Here's Sinus Bradycardia caught on a Qaly member's Apple Watch ECG. Notice here, too, this ECG shows a heart rate below 60 bpm.

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Here's Sinus Bradycardia caught on a Qaly member's Samsung Watch ECG. Notice that the Samsung ECG app labeled this as a Sinus Rhythm ECG, which can be confused with Sinus Bradycardia.
Here's Sinus Bradycardia caught on a Qaly member's Samsung Watch ECG. Notice that the Samsung ECG app labeled this as a Sinus Rhythm ECG, which can be confused with Sinus Bradycardia.

Is Sinus Bradycardia a Cause for Concern?

The good news is that, most of the time, Sinus Bradycardia is normal, especially in young athletes. A resting heart rate of 40-60 bpm during sleep is also normal in healthy people. However, sometimes Sinus Bradycardia can be caused by medication such as beta-blockers or calcium channel blockers. Other causes of Sinus Bradycardia include electrolyte imbalances and scarring of the sinus node in the heart as people get older, thyroid disorder, and sleep apnea.

As always, if you show signs of Sinus Bradycardia, contact your healthcare provider immediately to rule out the presence of harmful underlying conditions.

Conclusion

Well, that just about wraps up our guide on what Sinus Bradycardia 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 Bradycardia? On the Qaly app, human experts will interpret your ECGs for Sinus Bradycardia within minutes. Get started for free today.

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

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