tDCS in patients with implanted Parkinson’s brain pacemakers (DBS)
As a general rule: tDCS in patients with an implanted Deep Brain Stimulator (DBS) is not automatically prohibited, but there is a relevant safety risk, so it is only performed under clear precautionary measures and usually within a research setting.
DBS typically consists of three components:
- Intracerebral electrodes (e.g., in the subthalamic nucleus or globus pallidus internus)
- Extension leads running subcutaneously along the neck/thorax
- Impulse generator (similar to a heart pacemaker), usually implanted infraclavicularly
These metal structures can theoretically interact with externally applied electrical fields.
Potential Risks
- Induction of currents along the DBS leads
tDCS can conduct parasitic currents into deeper brain structures via the cables. - Overstimulation or malfunction of the DBS
Theoretically possible through electromagnetic interaction. - Uncontrolled current density at the electrode tip in the brain
- Heating of the electrodes
Especially during longer stimulation periods.
These risks are theoretically plausible, but clinically rarely systematically investigated.
Current State of Research
There are a few small studies in which tDCS was performed on Parkinson’s patients with DBS, typically using:
- Anodal stimulation over M1 or DLPFC
- 1–2 mA
- 20 minutes
In these small series, no serious side effects were reported. Nevertheless, virtually all publications emphasize:
- Performance only under neurological supervision
- Device check before and after stimulation
- Frequent temporary deactivation of the DBS
The evidence base is very small.
Practical Safety Rules (if performed at all)
If tDCS is being considered:
- Turn off the DBS during stimulation if possible
- Place electrodes far away from the generator
(no current path across the thorax/neck) - No electrodes near the DBS cables
(e.g., avoid Fp-mastoid montages) - Low intensity
- 1.0–1.5 mA
- Short duration
- 10–20 minutes
- Monitor the patient
Clinical Summary
With an implanted Parkinson’s brain pacemaker, tDCS is fundamentally possible but potentially risky and therefore not standard practice.
Many centers consider it a relative contraindication, especially outside of clinical trials.
Practical Note from a Neuromodulatory Perspective
For Parkinson’s patients with DBS implants, one would usually opt for other non-invasive procedures:
- TPS (Transcranial Pulse Stimulation)
- taVNS
- CES
- Peripheral Neuromodulation
These do not generate an electrical field in the brain and are therefore significantly less problematic regarding implants.
OK, Petros also sent an answer today 15-3-2026
here he sites a study without sending the primary publication link
A 2024 case report describing tDCS in a patient with severe brain injury, a ventriculoperitoneal shunt, and titanium mesh cranioplasty. The authors used MRI-based electric-field modeling to optimize electrode placement, reported no device-related complication, and described substantial clinical improvement. This is probably the most directly relevant published paper for your question, but it is still only one case report, so it supports feasibility more than it proves broad safety. 
More broadly, modern tDCS safety reviews and guidelines say there are no absolute contraindications to tDCS in general practice, although prior head surgery, altered anatomy, and implanted metallic/electrical devices require extra planning because they can change current distribution. A 2021 safety review reported no severe complications in adults or children when standard parameters up to 4 mA for up to 60 minutes/day were used, and the 2023 clinical practice guideline similarly states that there are no absolute contraindications while emphasizing caution with brain injury, surgery, and implants.
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