70 yr old male who presented following an episode of syncope. Nil significant medical history or medications. Describe and interpret this ECG. LITFL Top 100 ECG
Can you correctly interpret the ECG findings in a marathon runner with gastroenteritis? What is their significance? Is this AIVR?
ECG features of sinus arrhythmia. Sinus rhythm with beat-to-beat variation in the P-P interval producing an irregular ventricular rate.