Cynthia Petersen

ECG QRS Complex: What It Is and Why It Matters

What Is PR Prolongation (First-Degree AV Block)?

What Your ECG Wearable Can and Cannot Detect

Respiratory Sinus Arrhythmia: What It Is and Why It’s Normal

QT Interval Duration: What’s Normal and What’s Not?

AFib vs PVC: Comparing Mechanisms, Symptoms, and Triggers

Inappropriate Sinus Tachycardia and COVID: Causes, Symptoms, and More

What Are Shockable Heart Rhythms and Why Do They Matter?

Afib With PVC: Symptoms, Mechanics, and Possible Triggers