Structural Mechanisms of Dual-Target tDCS in Stroke Hemiparetic Hand

N/ANot Yet RecruitingNCT07605039

The Affiliated Nanjing Drum Tower Hospital of Nanjing University Medical School56 enrolled

Overview

This is a single-center, randomized, single-blind study investigating the effects of dual-target transcranial direct current stimulation (tDCS) combined with task-oriented functional electrical stimulation on upper limb recovery in patients with non-acute post-stroke hemiplegia. A total of 56 participants will be recruited and randomly assigned (1:1) to the dual M1 tDCS group or sham stimulation group. The intervention is delivered five times per week for four weeks, with 20 sessions in total. Multimodal MRI (T1W, T2W, and DTI) will be used to assess structural and network-level reorganization of sensorimotor pathways, including the corticospinal tract, in response to tDCS. The primary outcome is the Broetz hand function score, evaluated at baseline, post-intervention, and six-month follow-up. Secondary outcomes include Fugl-Meyer Assessment of the upper extremity (FMA-UE) and multimodal MRI-derived measures of white matter integrity. This study aims to elucidate the structural constraints underlying sensorimotor network lateralization and to identify responder and non-responder profiles based on corticospinal tract damage, providing mechanistic insight into individualized tDCS-based neurorehabilitation after stroke.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

SINGLE

Enrollment

Conditions

Stroke

Interventions

tDCSDEVICE

Bilateral M1 high-definition transcranial direct current stimulation (HD-tDCS) at 2 mA for 20 minutes per session, delivered five times per week for 4 weeks (total 20 sessions). Electrodes are placed over the left and right primary motor cortices. Each session is combined with task-oriented hand rehabilitation exercises targeting the affected upper limb. This intervention is designed to modulate interhemispheric sensorimotor network reorganization and promote hand function recovery after stroke.

Sham tDCSDEVICE

Bilateral M1 sham HD-tDCS: electrodes placed identically to the active group, with current ramped up and down for 10 seconds at the start and end of each 20-minute session, without sustained stimulation. Sessions are also combined with task-oriented hand rehabilitation exercises. This sham intervention serves as a control to evaluate the efficacy of active tDCS on interhemispheric network reorganization and hand function recovery.

Eligibility

Sex: ALLMin age: 30 YearsMax age: 75 Years

Medical Language ↔ Plain English

Inclusion Criteria: 1. Diagnosed with stroke according to the "Diagnostic Criteria for Major Cerebrovascular Diseases in China, 2019", confirmed by cranial CT or MRI. 2. First-ever unilateral subcortical stroke (involving the corona radiata, basal ganglia, thalamus, internal capsule, etc.). 3. Age 30-75 years. 4. Right-handed prior to stroke onset. 5. Stroke onset ≥ 2 weeks. 6. Hemiplegic hand function at Brunnstrom Stage I-III. 7. Written informed consent provided by the patient or legally authorized representative. Exclusion Criteria: 1. Any contraindications to MRI. 2. History of other neurological disorders or substance abuse. 3. Unstable conditions or rapidly progressive/malignant diseases, e.g., severe atrial fibrillation. 4. Severe skin allergies. 5. Inability to cooperate with basic communication or assessments, such as severe aphasia.

Structural Mechanisms of Dual-Target tDCS in Stroke Hemiparetic Hand

Overview

Conditions

Interventions

Eligibility

Outcomes

Primary Outcomes