Medicine
Electrocardiogram Interpretation for Cardiac Arrhythmias
Quick fact
Atrial fibrillation, one of the most common arrhythmias, often shows up on an ECG as an irregularly irregular rhythm with no clear P waves — yet many people with it feel completely fine.
Why this is interesting
Your heart beats around 100,000 times a day. How can a 10-second strip of squiggles tell a doctor whether that beat is safe or deadly?