What is a Fibrillatory wave?

Fibrillatory waves (Fw) are found of the surface 12‐lead electrocardiograms (ECGs) of patients in AF (Figure 1). They are oscillations in amplitude around the baseline and are dependent on the magnitude of the underlying voltage .

In conclusion, a short QT interval can be readily identified based on the first percentile of the new QTc formula. A short QTc is an important marker for the development of atrial arrhythmias, including atrial flutter and atrial fibrillation, with the former predominating.

Atrial fibrillation (AF) is the most common sustained dysrhythmia and is characterised by disorganised atrial electrical activity and contraction resulting in an “irregularly irregular” ventricular response (“fibrillation waves”) AF may be acute, transient, paroxysmal, or chronic and may or may not be rate-controlled.24 Mar 2021

This is because the P waves (flutter waves) in atrial flutter occur at about 250-350 per minute (usually around 300) . At this rate, it can appear that there is a P wave in front of each QRS and a T wave after each QRS.