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Illuminating Depression: ipRGC as a Potential Biomarker for Predicting Transcranial Magnetic Stimulation Treatment Response in Major Depressive Disorder

Status: Recruiting
Location: See location...
Intervention Type: Device
Study Type: Interventional
Study Phase: Not Applicable
SUMMARY

This research explores the potential of retinal ganglion cells (RGCs), particularly intrinsically photosensitive RGCs (ipRGCs), as biomarkers for predicting response to transcranial magnetic stimulation (TMS) in treatment-resistant depression (TRD). We also aim to assess the impact of TMS treatment on RGCs and ipRGCs in TRD patients, investigating associations with clinical improvements and cognitive status. A clinical trial involving 44 patients with treatment-resistant depression (TRD) will be conducted. All participants will receive rTMS targeting the dorsolateral prefrontal cortex (DLPFC). Data will be collected pre- and post-intervention, as well as at a 2-month follow-up, using multiple outcome measures, including the post-illumination pupil response (PIPR). The project seeks to confirm the effectiveness of TMS and the potential of RGCs/ipRGCs as predictors of treatment response, thereby facilitating the development of personalized treatment strategies for TRD patients undergoing rTMS therapy.

Eligibility
Participation Requirements
Sex: All
Minimum Age: 18
Maximum Age: 65
Healthy Volunteers: f
View:

• Diagnosis of MDD, confirmed via the structured clinical interview;

• TRD type;

• Age between 18-65 years;

• Visual acuity of 20/32 or better.

Locations
Other Locations
Portugal
RISE-Health, Center for Translational Health and Medical Biotechnology Research (TBIO), School of Health, Polytechnic of Porto
RECRUITING
Porto
Contact Information
Primary
Inês Duarte D Pais, MSc
idp@ess.ipp.pt
+351 917750656
Backup
Catarina C Mateus, PhD
cms@ess.ipp.pt
+351 962662157
Time Frame
Start Date: 2026-03-15
Estimated Completion Date: 2027-07-31
Participants
Target number of participants: 44
Treatments
Experimental: iTBS
iTBS Group (n=44) will receive high-frequency (50 Hz) left-side DLPFC iTBS (120% RMT stimulation intensity; 50 Hz frequency; 2s on and 8 s off; 600 pulses/session; total duration of 3 minutes). Treatment comprised 20 sessions in total, which consisted of once-daily sessions (on weekdays).
Related Therapeutic Areas
Sponsors
Leads: Polytechnic Institute of Porto
Collaborators: Hospital de Sao Joao, Porto

This content was sourced from clinicaltrials.gov

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