What Second-Degree AV Block Type 2 Looks Like on Your Watch ECG

Second Degree AV Block Type 2 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 Second-Degree AV Block Type 2 include P waves without QRS complexes, a constant P-P interval, and a constant PR interval.
  • Second-Degree AV Block Type 2 can become Complete Heart Block, which can lead to sudden cardiac arrest or heart failure.
  • If you believe you have Second-Degree AV Block Type 2, contact your healthcare provider immediately.

Got other questions on Heart Block? See the Qaly guides on Heart Block:

Introduction

Hello, heart hero. In your quest to identify that irregular heart rhythm you just felt, you may have come across the terms Second-Degree Atrioventricular Block Type 2, Second-Degree AV Block Type 2, Second-Degree Heart Block Type 2, or Mobitz II. Wow, that's a lot of terms for the same abnormal heart rhythm... With your trusty watch ECG now in hand, you may be wondering, "What does Second-Degree AV Block Type 2 look like on my watch ECG?" In this guide, we'll help you see Second-Degree AV Block Type 2 on your watch ECG. Let's dive in.

What's Second-Degree AV Block Type 2?

Before trying to identify Second-Degree AV Block Type 2 on your ECG, it's helpful to remind yourself what Second-Degree AV Block Type 2 actually is. (If you're confident in your Second-Degree AV Block Type 2 knowledge, though, skip on ahead to the next section for some visual examples of a Second-Degree AV Block Type 2 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.

Well, your heart has this great structure called the atrioventricular node, or AV node. It's a fancy word for the part of your heart that connects your heart's upper chambers, or atria, with your heart’s lower chambers, or ventricles. This connector lets your heart's electrical signal move from your atria to your ventricles, which is why it's called the "atrioventricular" node. Neat, huh?

Second-Degree AV Block Type 2 is an abnormal heart rhythm where your heart’s electrical signal slows down or gets interrupted on its way from your atria to your ventricles. In other words, your AV node is "blocked."

So What Does Second-Degree AV Block Type 2 Look Like on My Watch ECG?

To identify Second-Degree AV Block Type 2 on your ECG, look for these tell-tale signs:

  • P waves without QRS complexes next to them, known as "non-conducted" P waves.
  • A constant P-P interval, or the distance between the peaks of P waves. This includes non-conducted P waves.
  • A constant, normal PR interval or a constant, prolonged PR interval.
  • A narrow QRS complex, when the heart block is within a part of the heart called the "Bundle of His."
  • Or, in the more likely case, a wide QRS complex, when the heart block is away from a part of the heart called the "Bundle of His."

For visual examples, take a look at Second-Degree AV Block Type 2 seen on Qaly members' watch ECGs.

Here's Second-Degree AV Block Type 2 caught on a Qaly member's Apple Watch ECG. Notice the P waves without QRS complexes? The most visible one is right after the 8s mark and the 9s mark. Also notice the constant P-P interval as the P waves march through.
Here's Second-Degree AV Block Type 2 caught on a Qaly member's Apple Watch ECG. Notice the P waves without QRS complexes? The most visible one is right after the 8s mark and the 9s mark. Also notice the constant P-P interval as the P waves march through.

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Here's another Second-Degree AV Block Type 2 caught on a Qaly member's Apple Watch ECG. Here, you can see P waves without QRS complexes between 1s and 2s, as well as right before the 7s mark.
Here's another Second-Degree AV Block Type 2 caught on a Qaly member's Apple Watch ECG. Here, you can see P waves without QRS complexes between 1s and 2s, as well as right before the 7s mark.

Here's another Second-Degree AV Block Type 2 caught on a Qaly member's Apple Watch ECG. Notice again the constant P-P interval throughout the rhythm, along with P waves without QRS complexes. See that P wave without a QRS complex right after the 4s mark?
Here's another Second-Degree AV Block Type 2 caught on a Qaly member's Apple Watch ECG. Notice again the constant P-P interval throughout the rhythm, along with P waves without QRS complexes. See that P wave without a QRS complex right after the 4s mark?

Is Second-Degree AV Block Type 2 a Cause for Concern?

Yes. Second-Degree AV Block Type 2 can become Complete Heart Block, which can lead to sudden cardiac arrest or heart failure.

If you believe you have Second-Degree AV Block Type 2, contact your healthcare provider immediately.

If you're curious to learn about other heart blocks, here's what First-Degree AV Block looks like on your watch ECG, here's what Second-Degree AV Block Type 1 looks like on your watch ECG, here's what 2:1 AV Block looks like on your watch ECG, and here's what Complete Heart Block looks like on your watch ECG.

Conclusion

Well, that just about wraps up our guide on what Second-Degree AV Block Type 2 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 Second-Degree AV Block Type 2? On the Qaly app, human experts will interpret your ECGs Second-Degree AV Block Type 2 within minutes. Get started for free today.

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Wondering if it's Second-Degree AV Block Type 2? On the Qaly app, human experts will interpret your ECGs Second-Degree AV Block Type 2 within minutes. Get started for free today.

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