Example #3 . These QRS complexes are less than two large boxes apart, thus the heart rate is between 150 and 300 bpm. Multiply the number of QRS complexes by six for the ventricular rate — that ...

This is Lead I, of the original 3 Leads ECG. The particular tracings are called leads in ECG terminology. Once you have 3 electrodes connected you can get the 6 standard Leads.

Atrial fibrillation occurs when action potentials fire very rapidly within the pulmonary veins or atrium in a chaotic manner. The result is a very fast atrial rate — about 400 to 600 beats per ...

The Apple Watch added electrocardiogram (ECG) heart measurements in 2018, and the feature has been saving lives since. Learn how to use it.

ECG monitors made for at-home use can be a useful tool. Here’s what to consider, plus six to take a closer look at.