When every other beat conducts through an accessory pathway causing a short PR interval and a delta wave, the term WPW alternans is used. The accessory pathway that is exists is refractory on an ...

Electrical alternans is known to occur in some cases of SVT, atrial flutter, or ventricular tachycardia in the absence of pericardial problems. Electrical alternans, only during sinus rhythm, is ...

In pulsus alternans (also known as mechanical alternans), strong and weak pulses alternate, which signifies severe left ventricular dysfunction. The above figures are arterial pressure tracings taken ...

Implantable cardioverter-defibrillators (ICDs) have had a major impact on the treatment of ventricular tachyarrhythmias. Initially, physicians used ICDs primarily to treat patients who had survived ...

Abstract A 56-year-old woman with a history of stage II cancer of the left breast presented with progressive shortness of breath and fatigue. Transthoracic echocardiography revealed a large ...

Note the beat to beat variation in the QRS amplitude in the V1 rhythm strip with low voltage indicating a pericardial effusion.