Electromyographic investigations in torticollis

Area of Science:

• Neurology
• Neurosurgery
• Biomedical Engineering

Background:

• Torticollis, characterized by abnormal head posture, involves complex neck muscle dysfunction.
• Electromyography (EMG) is crucial for assessing neuromuscular activity in movement disorders.
• Understanding the neurophysiological basis of torticollis subtypes is essential for targeted treatment.

Purpose of the Study:

• To investigate the electromyographic (EMG) activity in neck muscles of patients with torticollis.
• To differentiate between spasmodic, myoclonic, and mixed EMG types of torticollis.
• To evaluate the effects of specific neural stimulation and coagulation on abnormal muscle activity.

Main Methods:

• Electromyographic (EMG) recordings were performed on 13 torticollis patients at rest.
• Stimulation of the H1 bundle (horizontal torticollis) and inner oral ventral nucleus (rotatory form) at 8, 25, and 50 Hz was applied.
• Coagulation procedures were performed, followed by post-intervention EMG assessment.

Main Results:

• Three distinct EMG patterns were identified: spasmodic, myoclonic, and mixed torticollis.
• Muscle stimulation frequently resulted in decreased amplitude and frequency of potentials, often leading to electric silence.
• Rhythmic grouped potentials typically preceded the electric silence during stimulation.
• Post-coagulation, spontaneous EMG activity in neck muscles was largely abolished in most patients.

Conclusions:

• EMG analysis can effectively differentiate subtypes of torticollis.
• Targeted neural stimulation demonstrates potential in modulating abnormal neck muscle activity.
• Coagulation appears to be an effective method for eliminating spontaneous EMG activity in torticollis patients, suggesting a viable therapeutic approach.