P waves will not be seen on the ECG in patients with atrial fibrillation. At times, the P wave activity may be observed as “coarse fibrillatory waves,” and the term “coarse atrial ...

A premature atrial contraction occurs when a focus in ... or the ectopic PR interval will be prolonged. The ECG will show a premature, ectopic P wave and then no QRS complex afterward.

Routine ECG recorded through noninvasive, cheap and easily available tolls have markers that portend higher stroke risk. Atrial fibrillation ... are currently elusive. Premature complexes ...