They investigate if extremely low level electromagnetic fields can suppress atrial fibrillation (using a ion cyclotron resonance).
" In 17 pentobarbital anesthetized dogs, bilateral thoracotomies allowed the placement of multi-electrode catheters on both atria and all pulmonary veins (PVs). AF was inducedby rapid atrial pacing (RAP) or programmed atrial extra-stimulation. At baseline and end of each hour of RAP, during sinus rhythm, atrial programmed stimulation gave both effective refractory period (ERP) and the width of the window of vulnerability (WOV).The latter was a measure of AF inducibility. Microelectrodes inserted into the anterior right ganglionated plexi (ARGP) recorded neural firing. Helmholtz coils were powered by function generator inducing an EMF (0.034 μGauss,0.952 Hz). Group-1 (n=7): Application of EMF to both cervical vagal trunks. Group-2: Application of EMF across the chest, so that the heart was centered within the coil (n=10)."
" Group-1: EMF induced a progressive increase in AF threshold at all PV and atrial sites (all P<0.05). Group-2: The atrial ERP progressively shortened and the ERP dispersion and WOV progressively increased (p<0.05;compared to baseline values) during 3 hours of RAP then returned toward baseline during 3 hours of combined RAP+EMF (p<0.05, compared to the end of the 3rd-hour of RAP). The frequency and amplitude of the neural activity recorded from the ARGP was markedly suppressed by EMF in both groups."
The frequency was calculated considering the ion cyclotron resonance frequency for a specific molecule in this case vasostatin-1 (that they consider a critical element in suppressing the activity of the intrinsic cardiac autonomic nervous system).
They mention that the frequency is a very important parameter because in experiments a little variation in frequency can provoque the fading of the effect, this is a symptom of a resonance phenomena.
Last modified on 18-Mar-16