A pacemaker may be needed to relieve symptoms when no reversible cause ... The strip below shows a junctional rhythm with retrograde P waves seen just before the QRS complex.

If there is sinus rhythm, and the heart rate is greater than 100 bpm, then sinus tachycardia is present. The links below take you to examples of each of these. If there are no P waves present ...

If there are no P-waves, the patient is not in sinus rhythm. A common reason for this is atrial fibrillation, in which normal electrical activity in the atria (P-wave) is replaced by chaotic ...

Share on Pinterest An EKG displays P Waves, T Waves, and the QRS Complex. These may have abnormalities in people with A-fib. A “normal” EKG is one that shows what is known as sinus rhythm.