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Transcranial Direct Current Stimulation

Rehabilitation estimated about CNY 250-600

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Description

A non-invasive neuromodulation technique delivering low-intensity, constant electrical current through scalp electrodes to modulate cortical excitability and influence brain function for therapeutic or research purposes.

Main Uses

Primary clinical and research applications include: adjunctive treatment for major depressive disorder (especially treatment-resistant depression), cognitive rehabilitation in stroke and traumatic brain injury, modulation of motor cortex excitability in Parkinson’s disease and chronic pain syndromes, enhancement of working memory and attention in healthy aging and ADHD, and experimental use in addiction, anxiety, and schizophrenia — always as part of multimodal therapy under professional supervision.

Normal Range

tDCS is not a diagnostic laboratory test with quantitative 'values' or reference ranges; it is a non-invasive neuromodulation technique. Parameters are set by the clinician and include: current intensity (typically 1–2 mA), session duration (20–30 minutes), electrode size (25–35 cm²), and electrode placement (e.g., F3/F4, C3/C4 per 10–20 EEG system). No biological 'normal range' exists for tDCS output — safety thresholds are defined by international guidelines (e.g., ≤2 mA, ≤30 min, current density ≤0.08 mA/cm²).

Low Values - Possible Causes

Low perceived or measured stimulation effect may result from: 1) Subthreshold current intensity (<1 mA), 2) Inadequate electrode contact or high skin impedance, 3) Incorrect electrode placement (e.g., misaligned montages), 4) Insufficient session duration (<15 min), 5) Individual neuroanatomical variability (e.g., skull thickness, cortical atrophy).

High Values - Possible Causes

Excessive or unintended stimulation effects may arise from: 1) Current intensity exceeding 2 mA (off-label/unapproved), 2) Prolonged session duration (>30 min), 3) Small electrode size leading to elevated current density (>0.08 mA/cm²), 4) Use of conductive gels/solutions with uncontrolled ion concentration, 5) Concurrent use with other neuromodulatory agents (e.g., certain medications lowering seizure threshold).

neuromodulation therapy non-invasive brain stimulation tDCS clinical protocol

estimated about CNY 250-600