Post-traumatic delayed onset pectoralis myospasm secondary to α-γ dysfunction

Area of Science:

• Neurology
• Pain Management
• Musculoskeletal Disorders

Background:

• Delayed onset muscle spasms can be refractory to conventional treatments.
• Alpha-gamma (α-γ) loop dysfunction is a proposed mechanism for certain myospasms.
• Previous studies suggest neurectomy or botulinum toxin A for postsurgical myospasms.

Observation:

• A motor vehicle accident victim presented with persistent left pectoralis myospasms.
• The patient's spasms were unresponsive to behavioral, conservative, physical therapy, opiate, muscle relaxer, and spinal block treatments.
• An initial lidocaine injection was administered to gauge treatment response.

Findings:

• Two subsequent treatments with botulinum toxin A led to complete resolution of the patient's myospasms.
• This case supports the efficacy of botulinum toxin A for treating trauma-induced myospasms.
• The successful outcome aligns with the hypothesis of α-γ loop dysfunction as a causative factor.

Implications:

• Botulinum toxin A offers a viable therapeutic option for refractory myospasms.
• Understanding the pathophysiology of α-γ loop dysfunction is crucial for targeted treatments.
• This case highlights the potential of targeted neurotoxin therapy in managing complex muscle spasm cases.