Longer upper airway lengths in Robin Sequence: A case-control study using computed tomography

Area of Science:

• Pediatric Anesthesiology
• Craniofacial Anomalies
• Airway Management

Background:

• Direct laryngoscopy and intubation present challenges in children with Robin Sequence.
• Existing research on airway differences in Robin Sequence focuses on patency, with limited data on intubation trajectories.
• Understanding intubation depth and pathways is crucial for improving airway management and reducing endotracheal tube malpositioning.

Purpose of the Study:

• To investigate differences in longitudinal airway parameters relevant to intubation in children with Robin Sequence compared to age-matched controls.
• To provide quantitative data on specific airway measurements influencing intubation depth and trajectory.

Main Methods:

• A case-control study involving 33 children with Robin Sequence (<4 years) and 33 age- and sex-matched controls.
• Computed tomography (CT) scans of the head and neck were analyzed for measurements including nasopharynx, oropharynx, hypopharynx, tongue, hyoid, and distances from teeth/nares to vocal cords.
• Statistical analysis utilized multiple ANCOVA models, controlling for height/length, weight, and age.

Main Results:

• Patients with Robin Sequence exhibited significantly longer front teeth to vocal cord (1.2 cm) and nares to vocal cord (0.8 cm) distances.
• The tongue was positioned higher (0.5 cm) and more posteriorly (0.9 cm) in Robin Sequence patients.
• The hyoid bone was positioned more inferiorly (0.5 cm) and posteriorly (0.2 cm) in the Robin Sequence group.

Conclusions:

• Children with Robin Sequence under 4 years have significantly altered airway anatomy affecting intubation.
• Longer vocal cord distances and altered tongue/hyoid positioning necessitate adjustments in endotracheal tube selection and placement.
• These findings can help reduce endotracheal tube malpositioning in this vulnerable pediatric population.