Just as in atrial fibrillation, not all of the P waves ... and has a variable appearance on ECG in regards to the flutter waves.

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 ...

The assessment encompasses indications such as atrial fibrillation, sinus rhythm, bradycardia, atrial flutter ... based on the pivotal VALID-ECG study data. This trial involved 198 subjects ...