Is abnormal response of superior sinoatrial node to sympathetic stimulation a characteristic finding in patients with atrial fibrillation and symptomatic bradycardia?
Superior SAN serves as the EAS during sympathetic stimulation in patients without AF and in most patients with AF without symptomatic bradycardia. In contrast, unresponsiveness of superior SAN to sympathetic stimulation is a characteristic finding in patients with AF and symptomatic bradycardia.
SUV