The basic rhythm is sinus. Many premature beats are present, which are all preceded by prematurely occurring P waves (marked by x) and are all PACs. The premature P waves shown in Figure 2 are all ...

The atrial rate is approximately 160 beats per minute (bpm) with inverted P waves in II-III-AVF. The narrow ventricular complexes are regular at 80 bpm, with 2:1 atrioventricular (AV) block. These ...

A young woman in her 20s who was 8 months into her first pregnancy presented with periodic heart palpitations at rest. The patient had been experiencing palpitations that lasted for a few minutes and ...

A 90 year old male with no past medical history to clinic with a complaint of generalized weakness, dizziness, and dyspnea on exertion. Mild lower extremity edema, paroxysmal nocturnal dyspnea, and ...

There is both experimental and clinical evidence 11 that extrasystoles and tachycardia originating in the atrioventricular node often cannot be differentiated from corresponding arrhythmias arising ...