Sinus Rhythm Vs. Wolff-Parkinson-White Syndrome on Your Watch ECG

Sinus Rhythm WPW 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 WPW? See the Qaly guides on Sinus Rhythm and WPW:

Introduction

The accessibility of electrocardiograms (ECGs) has dramatically increased in recent years with the advent of smartwatches and wearable tech. These innovations are a boon for heart health, offering real-time insights and early detection of potential issues. However, understanding the intricate patterns and rhythms can be challenging. Today, we will decode two specific ECG outputs: sinus rhythm and Wolff-Parkinson-White (WPW) syndrome. Understanding sinus rhythm vs WPW can give you a clearer insight into your heart's function and potential anomalies. Let’s dive in.

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

What’s Wolff-Parkinson-White Syndrome?

Wolff-Parkinson-White (WPW) syndrome, on the other hand, is a heart condition characterized by an additional electrical pathway between the heart's upper and lower chambers. This can cause a rapid heart rate, or tachycardia.

Wolff-Parkinson-White read on an Apple Watch ECG through the Qaly app.
Wolff-Parkinson-White read on an Apple Watch ECG through the Qaly app.


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On an ECG, WPW is often identified by a specific sequence called a "delta wave". This is seen as a slurred upstroke in the wide QRS complex, followed by a short PR interval. Understanding WPW, its implications, and what it means for your overall heart health is key. Here’s more on what WPW looks like on your watch ECG.

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

What’s the Difference Between Sinus Rhythm and Wolff-Parkinson-White Syndrome?

When comparing sinus rhythm vs WPW ECG readings, the primary difference lies in the regularity and origin of the electrical impulses. Sinus rhythm is the regular, healthy rhythm of the heart, whereas WPW syndrome indicates an abnormality in the heart's electrical system.

As for the impact on health, sinus rhythm is a sign of a normally functioning heart. WPW syndrome, however, can lead to complications such as rapid heart rate, palpitations, dizziness, or even more serious conditions like cardiac arrest.

Remember, while your smartwatch ECG can provide valuable information, it should not replace professional medical advice. Always consult a healthcare provider if your ECG readings show abnormal results or if you're experiencing cardiac symptoms. Remember, stay informed, stay proactive, and stay heart healthy!

Still Not Sure if It’s Sinus Rhythm or Wolff-Parkinson-White Syndrome on Your ECG?

Differentiating between sinus rhythm vs WPW 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 WPW? On the Qaly app, human experts will interpret your ECGs for Sinus Rhythm and WPW 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

Get 3 days of unlimited ECG reviews for free -->

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

Try Qaly for Free