Atrial Fibrillation
Regularity: R-R intervals are irregular, overall rhythm is irregularly irregular. The ventricles conduct from differnt atrial foci, which is what causes the irregularity.
Rate: Atrial rate usually exceeds 350 The ventricular rate is between 60 and 100 beats/min. This is known as "controlled" A-fib. If the ventricular rate is more than 100, it's consider A-Fib with Rapid Ventricular Response (RVR), also known as uncontrolled A-Fib.
P WAVE: Due to the atria firing so rapidly from multiple foci, there are no obvious P waves in the rhythm. The baseline appears chaotic because the atria are fibrillationg, therefore no P waves are produced.
PRI: Because there are no P waves, PRI cannot be measured.
QRS: Measures less than 0.12 seconds.
