We read with great interest the case report of cardioneuroablation (CNA) in permanent 2:1 atrioventricular block (AVB) by Bulava and colleagues. In this report, authors claim that this is the first case report that shows a correction of an AVB after slow pathway ablation with CNA. However, clinical usage of CNA in a similar condition was first demonstrated by our group and was published in the Heart Rhythm Case Reports journal in 2015.Functional AVB is one of the paroxysmal AVB types characterized by a sudden change from normal atrioventricular conduction to transient second- or third-degree AVB owing to parasympathetic influence on cardiac conduction. Well-characterized prodromal symptoms that last longer than 5 seconds are usually seen prior to syncope. To differentiate functional AVB from intrinsic ones, the electrocardiogram characteristics of AVB should be carefully examined on continuous Holter tracings. In functional type, AVB is usually preceded by sinus node slowing. Also, a progressive PR prolongation before AVB may be noticeable. To demonstrate the functional nature and to select suitable candidates for CNA, atropine response was successfully used by our group, not only in patients with paroxysmal but also in patients with permanent AVB.