Expert ECG Quiz 11 Answer

1. Sinus tacycardia
2. Wolff-Parkinson-White with alternans

This ECG shows every other beat having a short PR interval and a delta wave. This is called WPW-alternans. The accessory pathway that is exists is refractory on an alternating basis creating this appearance. This is a relatively rare ECG finding.

Related Topic Reviews: Sinus Tachycardia, WPW ECG Review