The ECG Blog with Reid

Quick Tip: How to Calculate Heart Rate in Atrial Fibrillation on ECG atrial fibrillation Sep 12, 2025

Atrial fibrillation (AF) gives an irregularly irregular ventricular response, so the usual single-cycle methods (300/large-boxes, 1500/small-boxes) ar...

How Calcium Channel Blockers Slow the Ventricular Response in Atrial Fibrillation atrial fibrillation calcium channel blockers Jun 06, 2025

Atrial fibrillation (AF) is marked by chaotic atrial activity that can drive the ventricles at dangerously high rates. While the atria may be firing a...

Why Atrial Fibrillation with Ventricular Pacing Can Appear Regular atrial fibrillation complete av block pacemaker Jun 02, 2025

Atrial fibrillation (AF) is classically described as an irregularly irregular rhythm, defined by chaotic atrial activity and a ventricular response th...

Atrial Fibrillation with Complete Heart Block: The Physiology of “Regularized” Atrial Fibrillation atrial fibrillation complete av block heart blocks Jan 24, 2025

Atrial fibrillation (AF) is classically characterized by an irregularly irregular ventricular rhythm due to chaotic atrial depolarization and random c...

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