Stroke Clinical Trial
Official title:
Transcranial Direct Current Stimulation as Coadjuvant Intervention in Post-stroke Neglect Rehabilitation
Introduction Stroke is the main cause of disability in the world and its sequelae have a great impact in the functional independence and quality of life of patients and families. Unilateral spatial neglect is one of the most frequent cognitive deficits after stroke, and its maintenance is associated with poor functional outcome of the rehabilitation process. For many years clinical research has been conducted to develop new and effective rehabilitation strategies for neglect. Noninvasive brain stimulation (NIBS) techniques are important tools in this regard, and it should be considered as a therapeutic intervention used in combination with conventional neuropsychological approaches. Transcranial direct current stimulation (tDCS) is a noninvasive, safe, neurophysiological technique able to modulate cortical activity by inducing a weak electric current into the brain. The studies focused on neglect symptoms treatment by means of tDCS over the lesional and contralesional hemisphere have shown promising results and its combination with conventional neglect therapies may enhance treatment efficacy and speed the recovery. Objectives To improve neglect symptoms by reducing the pathological hyperactivity of the undamaged hemisphere after right medial cerebral artery stroke, through the application of multisite tDCS, and to validate a NIBS protocol for the enhancement of conventional neuropsychological rehabilitation outcome. Methods The sample will be composed by 30 patients with spatial neglect secondary to a ischemic stroke in the middle cerebral artery in subacute stage (3 to 12 months since the event). The patients will be randomly assigned to one experimental group (Active, Sham, and Control). The intervention protocol consists in a two weeks intervention (10 sessions, 45 min, Monday to Friday) of tDCS and neuropsychological rehabilitation applied concurrently. In each session a 20 min tDCS at 2 milliamps (m will be applied over P3 according to 10/20 EEG international system (cathodal) with return electrodes placed in C3,CP5,CP1,Pz,PO3,PO7,P7 (10/20 EEG). StarStim® tDCS 8 channels Multisite device will be used.
Transcranial direct current stimulation (tDCS) is a safe and non-invasive neurophysiological technique with enough scientific literature that supports its effectiveness and safety, both in healthy subjects and in different neurological pathologies. However, it has not been consolidated yet as a real clinical alternative for other pathologies different from depression, due to the impossibility of establishing specific intervention protocols given the heterogeneity of the samples and the methods of assessment of the results used in the different studies. Regarding stroke, although there is large empirical evidence of its effectiveness in motor rehabilitation, there are few studies to date focused on cognitive rehabilitation, such neglect rehabilitation. Hypothesis The main hypothesis is that patients who receive a treatment based on tDCS in combination with conventional neuropsychological intervention for the recovery of neglect will have a greater improvement in neglect symptomatology in comparison to patients who receive the conventional treatment in isolation. Objectives The main objective of the project is to validate a protocol for the enhancement of conventional neuropsychological rehabilitation using tDCS in a group of patients with spatial neglect secondary to a cortical ischemic stroke in the middle cerebral artery (MCA) in a subacute phase (3 to 12 months since the event). Specific objectives: - To demonstrate that non-invasive neuromodulation by means of tDCS enhances the efficacy of the conventional neuropsychological rehabilitation. - Identify clinical and neurophysiological variables of the patients are the best predictors of the efficacy of the combined treatment. - To verify the greater impact of the combined treatment in the improvement of the symptomatology of neglect as well as in the patient's quality of life in comparison with the conventional intervention. Methods Design: The present study is a parallel, randomized, controlled and triple blind experimental study. The patients included in the sample will be randomly distributed into three groups (Exp, Sham and Control) that will be blind to the patients, to the researchers who apply the tDCS and to the pre and post intervention evaluators. - Experimental group (Exp): active tDCS + conventional neuropsychological rehabilitation. - Control group placebo-tDCS (Sham): placebo tDCS (sham) + conventional neuropsychological rehabilitation. - Control group (Control): conventional neuropsychological rehabilitation without tDCS. The duration of the study will be 3 years. Sample: The sample will consist of 30 volunteer patients randomly distributed to one of the experimental condition (1:1:1) with blind of the randomization sequence. Randomization will be done with the help of the research support department of the Francisco de Vitoria University. Patients will be recruited in the Brain Damage Unit of Beata María Ana Hospital by the unit neurologist and neuropsychologists among those patients who meet the inclusion criteria. ;
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