Cortical Excitability Modulation With ctDCS in Fibromyalgia.

The prevalence of fibromyalgia is approximately 2.7%, with a female-to-male ratio of 3:1. Although it is a relatively common syndrome, there are many doubts regarding its diagnosis and pathophysiology. In addition to the previously mentioned questions, this pathology has high social costs due to its association with the loss of labor productivity and it is characterized by being unresponsive to pharmacological treatment. Given the limited effectiveness of available therapeutic options, new therapeutic and diagnostic options have been sought. This scenario includes the use of different techniques of non-invasive brain stimulation, such as transcranial direct current magnetic stimulation (tDCS) and transcranial magnetic stimulation (TMS), which have already had promising results in reducing pain. In addition, TMS also allows measuring parameters that help to understand the reorganization of physiological processes. In this study, TMS is used to understand the pathophysiology of fibromyalgia, while tDCS allows modulating the excitability of the neuronal membrane potential of cortical and subcortical neural networks, producing a neuromodulatory effect of the top-down type. According to the evidence, the greatest impact on pain is associated with stimulation of the primary motor cortex (M1), but recent studies have shown the possible relationship between stimulation of extracerebral regions such as the cerebellum, with an analgesic effect present in healthy individuals and patients with different pathologies. In the same way, the cortical excitability measures obtained through TMS allow us to identify the imbalance between inhibitory and excitatory systems, related to pain perception and the analgesic response of endogenous mechanisms. In this research, our objective is to evaluate the effect of cerebellar tDCS on clinical measures of pain and cortical excitability in patients with fibromyalgia. This is a randomized, double-blind, controlled clinical trial, parallel, which has as its primary outcome, the evaluation of the variations in motor evoked potential (MEP) (neurophysiological outcome) and the numerical pain scale (NPS) as a clinical outcome. Secondary outcomes include the silent period (CSP), intra-cortical facilitation (ICF) and intra-cortical inhibition (ICI) obtained through TMS, the function of the descending modulatory path of pain by the conditioned modulation test (CPM test), the Brief Pain Inventory (BPI) and the pain thresholds by heat, pressure and cold. The intervention consists of a single tDCS session in which two devices will be used simultaneously. The active electrode will be placed in the cerebellum and/or in the primary motor cortex (4 stimulation protocols that will be implemented; active cerebellum electrode - active M1 electrode, sham cerebellum electrode - active M1 electrode, active cerebellum-M1 sham electrode, sham cerebellum electrode-M1 sham electrode) and the cathode in the contralateral supraorbital region. The equipment will apply a current of 2 mA for 20 minutes. In total, there will be 92 patients, divided into 4 intervention blocks and composed of 23 individuals each.