NCT04401319

rTMS and EEG in DOC Patients

Repetitive Transcranial Magnetic Stimulation and Electroencephalography in Patients With Disorders of Consciousness

• Status: Unknown
• Phase: N/A
• Study type: Interventional
• Enrollment: 90 (estimated)
• Sponsor: University of Liege · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

Background: Severe brain injury could cause chronic disorders of consciousness (DOC). Treating DOC patients to improve recovery remains very challenging. A few randomized controlled studies have been published in the recent years, focusing on non-invasive brain stimulation (NIBS) treatments to improve patients' neurobehavioural functioning. Among NIBS, repetitive transcranial magnetic stimulation (rTMS) is a non-invasive brain stimulation technique that can modulate cortical excitability, enhance neural plasticity, and induce strong neuromodulatory effects that outlast the period of stimulation. It is thought to modulate cortical activity and could therefore be effective for treating DOC patients. Currently, there is no unified protocol for rTMS in DOC patients and studies vary in many aspects. In this study, the investigators aim to improve the functional recovery of DOC patients following severe brain injury using rTMS in two multi-center double-blind studies. Methods/design: The investigators will recruit 90 DOC patients. Patients will have three rTMS sessions that will be randomized within patients in a crossover design: (i) one real stimulation on the left dorsolateral prefrontal cortex (DLPFC); (ii) one real stimulation on the left angular cortex (AG) and (iii) one sham stimulation. Sessions will be separated by at least 5 days washout period. Each stimulation session will last 20 minutes with a frequency of 20Hz (train duration: 4s; inter-train interval: 26s; 3200 pulses at 80% of the resting motor threshold - RMT). The RMT, i.e., the minimum stimulus intensity that generated a motor evoked potential response of at least 50μV at rest for 5 out of 10 trials, will be calculated for the stimulation target using single-pulses on the right abductor pollicis brevis muscle. After an interval of one week, a parallel design study will begin. Ninety patients will be randomly divided in two experimental groups and one sham group (30 patients per group). Stimulation will be performed for 20 working days once a day with the same stimulation parameters as in the crossover study. Primary outcome will be determined as behavioral response to treatment as measured using the Coma Recovery Scale - Revised (CRS-R). Resting-state high-density EEG will be also recorded to investigate the neurophysiological correlates by rTMS. Discussion: This study will contribute to define the role of rTMS for the treatment of DOC patients and characterise the neural correlates of its action. In addition, the investigators will define the responders' profile based on patients' characteristics and functional impairments and develop biomarkers of responsiveness using machine learning to categorize EEG signals according to clinical responsiveness to the treatment.

Conditions

• Disorder of Consciousness

Interventions

Type	Name	Description
DEVICE	Sham Stimulation for Crossover Study	Stimulation will be delivered on the dorsolateral prefrontal cortex (DLPFC) or the angular cortex (AG) using a sham coil for 20 minutes with a frequency of 20Hz (train duration: 4s; inter-train interval: 26s; 3200 pulses at 80% of the resting motor threshold ) in one session. A single session will be conducted.
DEVICE	DLPFC Stimulation for Crossover Study	Stimulation will be delivered on the left dorsolateral prefrontal cortex (DLPFC) using a real coil for 20 minutes with a frequency of 20Hz (train duration: 4s; inter-train interval: 26s; 3200 pulses at 80% of the resting motor threshold ) in one session. A single session will be conducted.
DEVICE	AG Stimulation for Crossover Study	Stimulation will be delivered on the left angular cortex (AG) using a real coil for 20 minutes with a frequency of 20Hz (train duration: 4s; inter-train interval: 26s; 3200 pulses at 80% of the resting motor threshold ) in one session. A single session will be conducted.
DEVICE	Sham Stimulation for Parallel Study	Stimulation will be delivered on the dorsolateral prefrontal cortex (DLPFC) or the angular cortex (AG) using a sham coil for 20 minutes with a frequency of 20Hz (train duration: 4s; inter-train interval: 26s; 3200 pulses at 80% of the resting motor threshold ) in one session. Twenty sessions will be conducted.
DEVICE	DLPFC Stimulation for Parallel Study	Stimulation will be delivered on the left dorsolateral prefrontal cortex (DLPFC) using a real coil for 20 minutes with a frequency of 20Hz (train duration: 4s; inter-train interval: 26s; 3200 pulses at 80% of the resting motor threshold ) in one session. Twenty sessions will be conducted.
DEVICE	AG Stimulation for Parallel Study	Stimulation will be delivered on the left angular cortex (AG) using a real coil for 20 minutes with a frequency of 20Hz (train duration: 4s; inter-train interval: 26s; 3200 pulses at 80% of the resting motor threshold ) in one session. Twenty sessions will be conducted.

Timeline

• Start date: 2024-07-01
• Primary completion: 2024-11-01
• Completion: 2025-01-01
• First posted: 2020-05-26
• Last updated: 2023-12-12

Locations

2 sites across 2 countries: Belgium, Germany