Stroke Therapy With Brain Oscillation Synchronized Stimulation

Stroke is one of the leading cause for long-term disability worldwide. The standard approach to treat deficits after stroke is a rehabilitation therapy, that follows the stroke event directly. This therapy mainly includes physiotherapy and occupational therapy. Yet, despite intensive rehabilitation efforts, more than half of all stroke patients remain greatly disabled.

Repetitive TMS is capable of inducing plasticity-like effects in the brain, that are expected to enhance adaptive plasticity processes leading to functional regain after stroke. In the motor cortex, brain oscillation-synchronized TMS, i.e. TMS triggered dependent on the phase of instantaneous µ-alpha oscillations as detected by real-time EEG (electroencephalography) analysis, has been shown to consistently increase motor cortical excitability and plasticity effects. We therefore hypothesis that a greater therapeutic potential of TMS to modulate dysfunctional brain networks can be exploited by personalizing TMS therapy to individual brain states (i.e. brain oscillations).

This study aims to investigate the effectiveness of an ipsilesional 100 Hz TMS triplet burst protocol synchronized to the ongoing µ-alpha oscillation compared to the current TMS standard therapy of contralesional 1 Hz rTMS in chronic stroke patients. Both groups will undergo stimulation therapy three times a week, with each session directly followed by physiotherapy. Motor recovery will be assessed directly after as well as three months after completion of the therapy.

Inclusion criteria

• Patients are between 18 to 85 years old
• Patient suffers from chronic stroke including hand/arm paresis and spasticity
• Ipsilesional motor evoked potentials (MEPs) can be evoked (EMG > 50uV)
• RMT of contralesional side < 70% maximum stimulator output (MSO)
• Patient is willing to comply with the study restrictions.
• Subject FMA-UE at the lesioned side is <= 60.

Exclusion criteria

• Patient is under the age of legal consent.
• Patient has a history of seizure disorder.
• Patient with intake of pro-convulsive medication, e.g. , chlorpromazine, clozapine, foscarnet, ganciclovir, ritonavir, amphetamines, cocaine, MDMA (ecstasy), phencyclidine (PCP, angel's dust), ketamine, gamma-hydroxybutyrate (GHB), alcohol, theophylline, in accord with present consensus guidelines on safety, ethical considerations, and application of TMS in clinical practice and research (Rossi et al., 2009, 2021).
• Subject with intake of muscle-relaxing medication (e.g. baclofen, tizanidine, gabapentin,tolperisone, THC and derivates)
• When spasticity is treated with botox there have to be at least tree months since the last injection
• Patient has a cardiac pacemaker, implanted medication pump, intracardiac line, that is located close to (≤ 10 cm) to the location of activation of the TMS coil or acute, unstable cardiac disease.
• Patient has an intracranial implant (e.g., aneurysm clips, shunts, stimula-tors, cochlear implants, or electrodes) or any other metal object that is located close to (≤ 10 cm) to the location of activation of the TMS coil (excluding the mouth) and that cannot be safely removed.
• Patient has participated in another study within 2 weeks prior to the first study visit.
• Patient is pregnant or trying to get pregnant.
• Patient is unable to give informed consent.
• Patient is unable to understand the instructions of the FMA-UE or not motivated to follow these instructions.
• Patients who have contractions and therefore can't move.