A 32-year-old female presents with palpitations and chest tightness 1 week after a cold. Electrocardiogram (ECG) shows second-degree Wenckebach atrioventricular block. What is its characteristic ECG finding?
A 32-year-old female presents with palpitations and chest tightness 1 week after a cold. Electrocardiogram (ECG) shows second-degree Wenckebach atrioventricular block. What is its characteristic ECG finding?