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Low intensity transcranial electric stimulation: Safety, ethical, legal regulatory and application guidelines

A, Antal; I, Alekseichuk; M, Bikson; J, Brockmöller; AR, Brunoni; R, Chen; LG, Cohen; G, Dowthwaite; J, Ellrich; A, Flöel; F, Fregni; MS, George; R, Hamilton; J, Haueisen; CS, Herrmann; FC, Hummel; JP, Lefaucheur; D, Liebetanz; CK, Loo; CD, McCaig; C, Miniussi; PC, Miranda; V, Moliadze; MA, Nitsche; R, Nowak; F, Padberg; A, Pascual-Leone; W, Poppendieck; A, Priori; S, Rossi; PM, Rossini; J, Rothwell; MA, Rueger; G, Ruffini; K, Schellhorn; HR, Siebner; Y, Ugawa; A, Wexler; U, Ziemann; M, Hallett; W, Paulus
Abstract:
ow intensity transcranial electrical stimulation (TES) in humans, encompassing transcranial direct current (tDCS), transcutaneous spinal Direct Current Stimulation (tsDCS), transcranial alternating current (tACS), and transcranial random noise (tRNS) stimulation or their combinations, appears to be safe. No serious adverse events (SAEs) have been reported so far in over 18,000 sessions administered to healthy subjects, neurological and psychiatric patients, as summarized here. Moderate adverse events (AEs), as defined by the necessity to intervene, are rare, and include skin burns with tDCS due to suboptimal electrode-skin contact. Very rarely mania or hypomania was induced in patients with depression (11 documented cases), yet a causal relationship is difficult to prove because of the low incidence rate and limited numbers of subjects in controlled trials. Mild AEs (MAEs) include headache and fatigue following stimulation as well as prickling and burning sensations occurring during tDCS at peak-to-baseline intensities of 1-2mA and during tACS at higher peak-to-peak intensities above 2mA. The prevalence of published AEs is different in studies specifically assessing AEs vs. those not assessing them, being higher in the former. AEs are frequently reported by individuals receiving placebo stimulation. The profile of AEs in terms of frequency, magnitude and type is comparable in healthy and clinical populations, and this is also the case for more vulnerable populations, such as children, elderly persons, or pregnant women. Combined interventions (e.g., co-application of drugs, electrophysiological measurements, neuroimaging) were not associated with further safety issues. Safety is established for low-intensity 'conventional' TES defined as <4mA, up to 60min duration per day. Animal studies and modeling evidence indicate that brain injury could occur at predicted current densities in the brain of 6.3-13A/m2 that are over an order of magnitude above those produced by tDCS in humans. Using AC stimulation fewer AEs were reported compared to DC. In specific paradigms with amplitudes of up to 10mA, frequencies in the kHz range appear to be safe. In this paper we provide structured interviews and recommend their use in future controlled studies, in particular when trying to extend the parameters applied. We also discuss recent regulatory issues, reporting practices and ethical issues. These recommendations achieved consensus in a meeting, which took place in Göttingen, Germany, on September 6-7, 2016 and were refined thereafter by email correspondence.
Patologie/Applicazioni:
Anno:
2017
Tipo di pubblicazione:
Articolo
Parola chiave:
linee guida; tacs; trns; tdcs
Testata scientifica:
Clinical Neurophysiology
Nota:
Linee guida sulle applicazioni della stimolazione elettrica transcranica e sugli aspetti legati a sicurezza, etica e attuale legislazione della metodica.
DOI:
10.1016/j.clinph.2017.06.001

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