A wave of contraction spreads across the heart - to the left atrium and then to the ventricles. This enables the ventricles to contract together. Sometimes, the rhythm of the heart's natural ...

Just as in atrial fibrillation, not all of the P waves are able to conduct through the atrioventricular node, and thus the ventricular rate will not be as fast as the atrial rate. Typically ...

Because the atrial rate is so fast, and the action potentials produced are of such low amplitude, P waves will not be seen on the ECG in patients with atrial fibrillation. At times, the P wave ...

It improves significantly on previous methods of measuring heart rate using radar waves, which take readings from ...