Severe upper airway dysfunction in GNAO1-related disorders.

Area of Science:

• Neurology
• Genetics
• Pediatrics

Background:

• GNAO1-related disorders (GNAO1-RD) present a broad range of symptoms, including hypotonia, movement disorders (MD), epilepsy, and developmental delays.
• Movement disorders in GNAO1-RD often manifest as dystonia and choreoathetosis, with dyskinetic crises posing life-threatening risks.
• Limited research exists on upper airway dysfunction in GNAO1-RD, despite its potential impact.

Purpose of the Study:

• To investigate the implications of muscular hypotonia on upper airway function in GNAO1-RD patients.
• To examine the subsequent clinical outcomes and mortality associated with upper airway dysfunction in this population.

Main Methods:

• Retrospective analysis of medical records from four GNAO1-RD patients.
• Data collection included neurological examinations, EEG, genetics, imaging, and video documentation of movement and respiratory symptoms.
• Evaluation of treatment interventions and clinical outcomes.

Main Results:

• All four patients exhibited severe hypotonia and hyperkinetic movement disorders, experiencing recurrent dyskinetic crises.
• Significant respiratory complications, including inspiratory stridor and airway obstructions, were observed.
• All patients died at young ages (2.4-12 years) due to respiratory failure, despite interventions like deep brain stimulation (DBS) and tracheostomy.

Conclusions:

• Upper airway dysfunction is a major contributor to morbidity and mortality in GNAO1-RD.
• Current treatments, including DBS, are insufficient for managing swallowing and airway issues.
• Multimodal approaches and multicenter trials are crucial for improving patient outcomes.