Abstract Details

Title Is Fatigue Response to tDCS Mediated by Change in Affect? An Open-label tDCS-MRI Study

Topic Multiple Sclerosis

Presentation(s) S27 - MS Neuroimaging (2:48 PM-3:00 PM)

Poster/Presentation
Number 010

Objective To evaluate a real-time brain metabolic biomarker of fatigue by measuring neuronal response to transcranial direct current stimulation (tDCS) and the corresponding link to negative and positive affect changes.

Background

Repeated tDCS sessions targeting the dorsolateral prefrontal cortex (DLPFC) have been found to reduce the symptom of fatigue in patients with multiple sclerosis (MS) and other neurological conditions. DLPFC tDCS has been also shown to reduce negative affect and improve positive affect and is an effective treatment for major depression.

Design/Methods In this open-label trial, participants with MS and fatigue (Fatigue Severity Score>36) were enrolled in an intervention of 20x20-minute daily at-home tDCS sessions (2.0 mA, anode F3/cathode F4) paired with cognitive training. tDCS-MRI scans at baseline and follow-up were performed to measure real-time cerebral metabolic rate of oxygen (CMRO2) response to tDCS. tDCS-MRI was performed in a 3T scanner while wearing an MRI-compatible tDCS device. T2-Relaxation-Under-Spin-Tagging and phase contrast sequences were performed across 3 phases: pre-tDCS (current: 0mA), during tDCS (2mA), and post-tDCS (0mA). Self-reported outcomes assessed at baseline and follow-up were: self-reported fatigue (Modified Fatigue Impact Scale; MFIS), and affect (Positive and Negative Affect Schedule).

Results Participants were n=26 (58% female; age 48±11 years; median Expanded Disability Status Scale score of 3.5). Twenty daily sessions of tDCS led to a significant improvement in fatigue (51.7±13.9vs36.4±13.4, p<0.001) and a reduction in negative affect (13.6±5.2vs11.1±2.9, p=0.03). Fatigue reduction corresponded to increased positive affect (r=0.493, p=0.024). At baseline and follow-up, we found that CMRO2 increased significantly after tDCS (mean change baseline: 15.03±13.3ml/100g/min, p<0.001; mean change follow-up: 14.3±12.1ml/100g/min, p<0.001), and a greater neuronal response to tDCS at baseline (CMRO2) corresponded with a greater reduction in fatigue (MFIS; r=0.470, p=0.024).

Conclusions

Fatigue reduction following tDCS is mediated by changes in affect and corresponds to simultaneous increases in tDCS-induced neuronal oxygen metabolic rate in patients with MS.

Authors/Disclosures
Giuseppina Pilloni, PhD (NYU Grossman School of Medicine) PRESENTER	Dr. Pilloni has nothing to disclose.
	No disclosure on file
	No disclosure on file
Claire Sunha Choi, MD	Ms. Choi has nothing to disclose.
	No disclosure on file
	No disclosure on file
Lauren B. Krupp, MD, FAAN (NYU Langone Medical Center)	Dr. krupp has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Bristol Myers Squibb. Dr. krupp has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Celgene. Dr. krupp has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Medscape. Dr. krupp has received personal compensation in the range of $500-$4,999 for serving as a Consultant for EBIX. Dr. krupp has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Biogen. Dr. krupp has received personal compensation in the range of $500-$4,999 for serving on a Scientific Advisory or Data Safety Monitoring board for Hoffman LaRoche. Dr. krupp has received personal compensation in the range of $5,000-$9,999 for serving as an Expert Witness for MMMK. Dr. krupp has received personal compensation in the range of $500-$4,999 for serving as an Expert Witness for Patrick, Dolan, and Kaufman. Dr. krupp has received intellectual property interests from a discovery or technology relating to health care.
	No disclosure on file
Leigh E. Charvet, PhD (NYU Langone)	Dr. Charvet has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Johnson & Johnson. Dr. Charvet has received personal compensation in the range of $500-$4,999 for serving as a Consultant for Springer Healthcare. Dr. Charvet has received personal compensation in the range of $10,000-$49,999 for serving as a Consultant for YBrain. Dr. Charvet has stock in Johnson&Johnson.

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