At the AV node ‘every now and then’ a beat is conducted to the ventricles, resulting in an irregular ventricular rate, which is the typical ECG characteristic of atrial fibrillation. … Atrial fibrillationRegularityirregularOriginatria (SVT)P-waveabsentEffect of adenosinereduces heart rateAtrial Fibrillation – ECGpedia en.ecgpedia.org › wiki › Atrial_Fibrillation