Relationship between right cervical vagus nerve stimulation and atrial fibrillation inducibility: therapeutic intensities do not increase arrhythmogenesis.
BACKGROUND
Strong vagus nerve stimulation (VNS) is routinely used to induce and maintain atrial fibrillation (AF) in acute animal studies. Taken as a surrogate of increased vagal tone, such observations suggest an arrhythmogenic role of VNS in AF. In contrast, VNS has been demonstrated to have profound therapeutic effects in heart failure and other ailments.


OBJECTIVE
The purpose of this study was to examine the relationship between right cervical VNS and AF, especially the potential arrhythmogenic effects of therapeutic VNS.


METHODS
The relationship between VNS intensities and AF inducibility was studied in eight acute dogs at baseline and four different levels of VNS, which were set to prolong spontaneous sinus cycle length (SCL) by 20%, 40%, 60%, or 100%. The effect of mild VNS treatment on AF induction was further investigated in six chronically instrumented conscious dogs. These dogs were implanted with right cervical VNS stimulators and specialized atrial pacemakers. VNS intensity was titrated to slow the sinus rate by 10%.


RESULTS
In acute studies, it was found that mild to moderate VNS (i.e., producing < or =40% SCL prolongation) did not increase AF inducibility, while strong VNS (i.e., producing > or =60% SCL prolongation) did. In chronic studies, compared with controls, AF induction did not change during the 4-week VNS treatment.


CONCLUSIONS
AF inducibility by right cervical VNS is intensity dependent: strong VNS (producing > or =60% SCL prolongation) facilitates AF, while moderate VNS (producing < or =40% SCL prolongation) appears not to affect AF. The nonarrhythmogenic effect of therapeutic chronic VNS was further verified in conscious animals. We conclude that VNS with moderate intensities can be used to deliver therapeutic benefits without arrhythmogenic risk.
Zhang
Youhua
Y
Department of Molecular Cardiology, Cleveland Clinic, Cleveland, Ohio 44195, USA.
Ilsar
Itamar
I
Sabbah
Hani N
HN
Ben David
Tamir
T
Mazgalev
Todor N
TN
D000704:Analysis of Variance; D000818:Animals; D001281:Atrial Fibrillation / Q000503:physiopathology*; D018592:Cross-Over Studies; D004285:Dogs; D015716:Electrocardiography, Ambulatory; D022062:Electrophysiologic Techniques, Cardiac; D014630:Vagus Nerve / Q000503:physiopathology*; D055536:Vagus Nerve Stimulation / Q000379:methods*