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Moebius syndrome — Clinical Guidelines

Overview

Moebius syndrome is a rare congenital disorder characterized by bilateral facial nerve palsy and often accompanied by abducens nerve palsy, leading to impairments in facial expression, speech, and ocular movements 1 2 4.

Diagnosis

Key Diagnostic Criteria: Bilateral facial paralysis, absence of eye abduction, and often associated limb anomalies 1 2 4.

Recommended Tests: Imaging studies (CT, MRI) to assess cranial nerve involvement and associated anomalies such as coronoid process hypertrophy 2.

Neurological Evaluation: Assess for additional cranial nerve palsies, central hypoventilation, and brainstem abnormalities 5 7.

Management

First-Line Treatments:

- Speech Therapy: Focused on improving articulation, managing saliva, and enhancing overall speech intelligibility 1. - Orthognathic Surgery: For addressing trismus due to coronoid process hypertrophy 2.

Adjunctive Treatments:

- Facial Reanimation Surgery: Procedures like gracilis muscle transfer to improve facial movement 1. - Antisialogogue Medication: To prevent aspiration during anesthesia 4.

Special Populations

Pediatrics: High incidence of difficult intubation during anesthesia; use of facemask and spontaneous breathing techniques recommended 4.

Comorbidities: Increased risk of congenital cardiac disease, spinal anomalies, and peripheral neuropathies; comprehensive preoperative evaluation essential 4.

Key Recommendations

Implement intensive speech therapy early to improve speech intelligibility and manage drooling in patients with Moebius syndrome (Evidence: Moderate 1).

Consider bilateral coronoidectomy in cases of significant trismus to enhance mandibular excursion (Evidence: Weak 2).

Preoperative assessment should include evaluation for difficult intubation and potential aspiration risks due to associated anomalies (Evidence: Moderate 4).

Monitor for and manage central hypoventilation and brainstem abnormalities, particularly in neonates, through mechanical ventilation support if necessary (Evidence: Weak 5).

References

1 Fairgray E, Miles A. Enhancing surgical outcomes: The effects of speech therapy on a school-aged girl with Moebius Syndrome. International journal of pediatric otorhinolaryngology 2016. link 2 Turk AE, McCarthy JG, Nichter LS, Thorne CH. Moebius syndrome: the new finding of hypertrophy of the coronoid process. The Journal of craniofacial surgery 1999. link 3 Baraitser M, Rudge P. Moebius syndrome, an axonal neuropathy and hypogonadism. Clinical dysmorphology 1996. link 4 Ferguson S. Moebius syndrome: a review of the anaesthetic implications. Paediatric anaesthesia 1996. link 5 Fujita I, Koyanagi T, Kukita J, Yamashita H, Minami T, Nakano H et al.. Moebius syndrome with central hypoventilation and brainstem calcification: a case report. European journal of pediatrics 1991. link 6 Traboulsi EI, Maumenee IH. Extraocular muscle aplasia in Moebius syndrome. Journal of pediatric ophthalmology and strabismus 1986. link 7 Sudarshan A, Goldie WD. The spectrum of congenital facial diplegia (Moebius syndrome). Pediatric neurology 1985. link90061-x)

Moebius syndrome