Changing QRS Complex Morphology. Kyuhyun Wang, MD. Disclosures. ... If it affects every other beat, the tracing may simulate either ventricular bigeminy or electrical alternans.

The QRS complexes have a normal duration (0.08 sec) and morphology. The axis is very leftward between -30° and -90° (positive QRS complex in lead I and negative in leads II and aVF). This is a ...

Electrical alternans occurs when every other QRS complex has varying amplitudes and is from the heart swaying within a large pericardial effusion. Sinus arrhythmia requires a variation of at least ...

When every other QRS complex is a premature atrial contraction, then the rhythm is referred to as “ atrial bigeminy ” as seen in this strip above.. If a PAC occurs when the AV node has not yet ...

The regular arrhythmia occurring at the beginning of the electrocardiogram was identified as ventricular bigeminy. Single ventricular premature complexes (VPCs), as well as pairs and triplets of ...

Answer Ventricular bigeminy Explanation. There are clearly extra QRS complexes that are of different morphology compared to the QRS complexes with preceding p waves, ie, the sinus beats. The extra QRS ...