ADHD Electrophysiological Subtypes and Implications in Transcranial Direct-current Stimulation (tdcs&adhd)
|First Received Date ICMJE||June 18, 2012|
|Last Updated Date||April 19, 2014|
|Start Date ICMJE||June 2012|
|Primary Completion Date||December 2012 (final data collection date for primary outcome measure)|
|Current Primary Outcome Measures ICMJE
||Clinical Assessment (Amen Questionnaire) [ Time Frame: From September to December 2012 ] [ Designated as safety issue: Yes ]
The Amen Attention Deficit Disorder (ADD) Type Questionnaire is a 71-question self-test that evaluates the ADD syndrome. 0 never, 1 rarely, 2 Occasionally, 3 Often and 4 Very Often. Consists of a series of questions that evaluate five brain systems: basal ganglia (23 items), Cingular System (17 items), Temporal System (16 items), Prefrontal Cortex (24 items) and deep limbic system (20 items). Each system has a maximum score of 4, and if this punctuation is greater than 1.7 it is possible that the system is deviated from normality and implicated in AD/HD behavior.
The minimal average score is 5 (Best) and the maximum is 20 (Worst). More than four is suspicious of diagnosis, six or more of a score of three or four is needed to make diagnosis. Meets the criteria for inattentiveness (six or more on questions 1-14) and also scores six or more on the cingular system questions (24-36 items), over-focused ADD subtype is suspected.
|Original Primary Outcome Measures ICMJE
||Observable behaviour [ Time Frame: 3 months ] [ Designated as safety issue: No ]
The primary outcome was change in score on the QEEG Rating Scale (AMEN questionnaire), which assesses behaviour. Assessments were made at baseline (before stimulation), after the 10-12 days of stimulation, and at 1 and 3 months after stimulation.
|Change History||Complete list of historical versions of study NCT01649232 on ClinicalTrials.gov Archive Site|
|Current Secondary Outcome Measures ICMJE
|Original Secondary Outcome Measures ICMJE
||Event-related potentials (ERPs) [ Time Frame: 3 months ] [ Designated as safety issue: No ]
ERPs to the GO/NOGO task will be examined for changes as a result of treatment. Assessments were made at baseline (before stimulation), after the 10-12 days of stimulation, and at 1 and 3 months after stimulation.
|Current Other Outcome Measures ICMJE||Not Provided|
|Original Other Outcome Measures ICMJE||Not Provided|
|Brief Title ICMJE||ADHD Electrophysiological Subtypes and Implications in Transcranial Direct-current Stimulation|
|Official Title ICMJE||Implications of Electrophysiological ADHD Endophenotypes to Predict Response to Transcranial Direct-Current Stimulation|
In the present study the aim is to examine whether transcranial direct-current stimulation (tDCS) generated excitability changes and induce modifications of functional cortical architecture in Attention Deficit Hyperactivity Disorder (ADHD) patients. To achieve this, the investigators used an event-related potential (ERP) analysis based on 20 channel EEG recordings in ADHD subjects before and after bipolar tDCS-anode stimulation over F3/F4 or T5/T6 or P4/P3, during resting state and measure clinical scores and visual CPT tasks changes. Time courses and topography of independent component visual ERPs were compared before and after tDCS.
Important advances in the understanding of ADHD pathophysiology, such fMRI studies showing a focal frontotemporal loops dysfunction in brain activity, suggest that frontal brain stimulation might be helpful for the treatment of ADHD. In a recent study of Lyon's university with tDCS they concluded that tDCS is "cheaper and easier-use than transcranial magnetic stimulation (TMS) and the impact on symptomatology seems larger (impact on negative symptoms of schizophrenic patients) and longer (at least 3 months duration) than that TMS currently permits. It is possible that tDCS could in the future be used at home by patients themselves. The efficacy of tDCS depends of parameters like electrode position and current strength.
In this trial, The investigators investigated the effects of 12 days of anodal stimulation of the left dorsolateral prefrontal cortex in ten patients with ADHD (aged 8 +/- 3 years). tDCS was applied through a saline-soaked pair of surface sponge electrodes (35 cm2). The anode electrode was placed over F3/F4 or T5/T6 or P4/P3(based on the 10-20 International EEG System) of each subject. The cathode was placed over the contralateral mastoid area. A constant current between 1.1 and 2.0 mA was applied for 25 min/day (administered for 12 alternated days).
Prior to the first session, ADHD subjects were asked to complete and return a series of questionnaires, including the Conners Brief Symptom Inventory, a health history questionnaire, and the QEEG questionnaire. Subjects were then tested in a first session which lasted approximately three hours. During this period, a comprehensive structured clinical interview was carried out, comprising of an assessment of current and past ADHD symptoms, the history of problems at school, the past psychiatric history (including drug and medication use), as well as past and present comorbidities. Subsequently, EEG data was acquired. EEG data was first recorded while the subject was in eyes-closed and eyes-open resting conditions, lasting four minutes each. Then data was recorded while subjects performed a visual continuous performance task (VCPT). The VCPT took approximately 22 minutes to complete. In addition, subjects randomly performed either an auditory or an emotional continuous performance task.
The control group had a shortened procedure. Subjects were tested in a single session lasting approximately two and a half hours. During this period, a series of questionnaires (Brief Symptom Inventory, Health History questionnaire, Current Symptoms Scales) were filled out and thereafter, EEG data was acquired. Subsequently, a working memory task, which is not relevant here, was administered.
EEG was recorded using a Mitsar 201 19-channel electroencephalographic system. The input signals referenced to the linked ears were filtered between 0.5 and 50 Hz and digitized at a sampling rate of 250 Hz. Impedance was kept below 5 kOhm for all electrodes. Electrodes were placed according to the International 10-20 system using a electrode cap. Quantitative data was calculated using WinEEG software. Linked ears reference montage was changed to average reference montage prior to data processing. Eye-blink artefacts were corrected by zeroing the activation curves of individual ICA component score responding to eye blinks. In addition, epochs of the filtered electroencephalogram with excessive amplitude (>100 μV) and/or excessive fast (>35 μV in 20 to 35 Hz band) and slow (>50 μV in 0 to 1 Hz band) activity were automatically marked and excluded from further analysis. Finally, EEG was manually inspected to verify artefact removal.
The VCPT is a modification of the visual two-stimulus GO/NOGO paradigm. Three categories of visual stimuli were selected: 20 pictures of animals, 20 pictures of plants, and 20 pictures of humans (presented together with an artificial "novel" sound). The trials consisted of presentations of pairs of stimuli: animal-animal (GO trials), animal-plant (NOGO trials), plant-plant (IGNORE trials), and plant-human (NOVEL trials). The trials were grouped into four blocks. In each block a unique set of five animal stimuli, five plant stimuli and five human stimuli was selected. Each block consisted of a pseudo-random presentation of 100 stimuli pairs with equal probability for each trial category.
The task was to press a button as fast as possible in response to GO trials.
According to the task design, two preparatory sets were distinguished in the trials. In the "Continue set" a picture of an animal is presented as the first stimulus and the subject is supposed to prepare to respond. In the "Discontinue set" a picture of a plant is presented as the first stimulus and the subject does not need to prepare to respond.
During the task, subjects were seated in a comfortable chair, 1.5 m in front of a computer screen. The stimuli were presented on a 17 inch monitor using the Psytask (Mitsar Ltd.) software.
The primary outcome was change in score on the QEEG Rating Scale (AMEN questionnaire). The ERP and questionnaire/behavioural assessments will be made at baseline (before stimulation)and 3 months after stimulation.
This study involved 30 subjects, all aged between 7 and 13. All have been diagnosed with ADHD by a medical professional.
|Study Type ICMJE||Interventional|
|Study Phase||Phase 3|
|Study Design ICMJE||Allocation: Non-Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Factorial Assignment
Masking: Open Label
Primary Purpose: Treatment
|Intervention ICMJE||Device: Active tDCS
tDCS applied to left dorsolateral prefrontal scalp area through a saline-soaked pair of surface sponge electrodes (35 cm2). The anode electrode was placed over F3 (based on the 10-20 International EEG System) of each subject. The cathode was placed over the contralateral mastoid area. A constant current of 1.1 mA was applied for 25 min/day (administered for 12 alternated days).
Other Name: Chattanooga Iontophoresis
|Study Arm (s)||
|Publications *||Not Provided|
* Includes publications given by the data provider as well as publications identified by ClinicalTrials.gov Identifier (NCT Number) in Medline.
|Recruitment Status ICMJE||Completed|
|Completion Date||December 2012|
|Primary Completion Date||December 2012 (final data collection date for primary outcome measure)|
|Eligibility Criteria ICMJE||
|Ages||8 Years to 68 Years|
|Accepts Healthy Volunteers||Yes|
|Contacts ICMJE||Contact information is only displayed when the study is recruiting subjects|
|Location Countries ICMJE||Spain|
|NCT Number ICMJE||NCT01649232|
|Other Study ID Numbers ICMJE||vpradtdcs0102012|
|Has Data Monitoring Committee||Yes|
|Responsible Party||Spanish Foundation for Neurometrics Development|
|Study Sponsor ICMJE||Spanish Foundation for Neurometrics Development|
|Collaborators ICMJE||Not Provided|
|Information Provided By||Spanish Foundation for Neurometrics Development|
|Verification Date||April 2014|
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