Sinus Rhythm Vs. Premature Ventricular Contraction (Multiple) on Your Watch ECG

Sinus Rhythm PVC 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

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

Introduction

The fascinating world of heart rhythms shows itself through electrocardiograms (ECGs), a tool that helps interpret the electrical activity of the heart. With the advent of smartwatches, it is now possible to monitor these rhythms right from your wrist. In this article, we delve into two such rhythms: sinus rhythm and premature ventricular contractions (PVCs). To discern the differences and similarities of sinus rhythm with PAC vs PVC or premature ventricular contraction vs sinus rhythm, one must fully comprehend these heart rhythms.

What’s Sinus Rhythm?

Sinus rhythm, or normal sinus rhythm, is considered the standard rhythm of a healthy heart. In this pattern, electrical signals originate from the sinoatrial (SA) node located in the right atrium, initiating each heartbeat and ensuring they occur at a steady, regular rate.

Sinus Rhythm read on a Fitbit ECG through the Qaly app.
Sinus Rhythm read on a Fitbit ECG through the Qaly app.

On an ECG, sinus rhythm is characterized by a distinct P wave (indicating atrial contraction) followed by the QRS complex (signifying ventricular contraction), then the T wave (representing ventricular relaxation). This cycle repeats at a rate of 60-100 times per minute in adults at rest. Here’s more on what sinus rhythm looks like on your watch ECG.

Sinus Rhythm read on a Fitbit ECG through the Qaly app.
Sinus Rhythm read on a Fitbit ECG through the Qaly app.


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What Are Premature Ventricular Contractions (PVCs)?

Premature ventricular contractions occur when the ventricles — the lower chambers of the heart — beat prematurely. In an ECG, this looks like an early, wide, and bizarre-looking QRS complex that is not preceded by a P wave, and often followed by a compensatory pause. Here’s more on what a PVC looks like on your watch ECG.

PVCs read on a Samsung Watch ECG through the Qaly app.
PVCs read on a Samsung Watch ECG through the Qaly app.

PVCs read on a Kardia ECG through the Qaly app.
PVCs read on a Kardia ECG through the Qaly app.

What’s the Difference Between Sinus Rhythm and PVCs?

When comparing sinus rhythm with PAC vs PVC or premature ventricular contraction vs sinus rhythm, the key difference lies in the origin of the heartbeats. Sinus rhythm is initiated in the sinus node, resulting in a systematic, orderly contraction of the heart chambers. On the other hand, PVCs originate in the ventricles, causing them to contract before receiving signals from the sinus node, which can disrupt the regularity of the heart rhythm.

The impact on health varies as well. Sinus rhythm signifies a healthy heart rhythm. Occasional PVCs in a healthy heart might not cause any symptoms or require treatment. However, frequent PVCs can sometimes signify underlying heart disease and may be associated with symptoms like palpitations, dizziness, or chest discomfort. Any new or increased occurrence of PVCs should prompt medical evaluation.

In conclusion, monitoring these rhythms using a smartwatch ECG can provide valuable information about your heart health and assist in early detection of any rhythm abnormalities. It's essential to remember that these devices do not replace comprehensive medical evaluation and any concerns about your heart rhythm should be discussed with your healthcare provider. Stay informed, stay proactive, and stay heart healthy!

Still Not Sure if It’s Sinus Rhythm or Premature Ventricular Contraction (Multiple) on Your ECG?

Differentiating between sinus rhythm vs PVC on your ECG can be tricky. If you’re still looking for help interpreting your ECG further, check out the Qaly app on App Store or Play Store. On Qaly, human experts will interpret your ECGs within minutes, day or night. Try out the Qaly app for free today!

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

Try free, cancel any time
Try Qaly for Free
App Store - Download Qaly | ECG Reader
Try Qaly for Free
Google Play - Download Qaly | ECG Reader
Try Qaly for Free
3 days free, cancel any time
QALY app - ecg reviews, ecg reader, ecg interpretations, review your ecg

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

Try Qaly for Free