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Sleep Apnea

Sleep Apnea

Sleep apnea is a condition where breathing stops intermittently during sleep, often leading to significant health issues. Each episode can last from 10 to 20 seconds or more and is frequently accompanied by a brief arousal from sleep. This disturbance, largely unnoticed by the individual, can lead to severe daytime fatigue. Commonly, individuals seek help after being informed by their partners about loud snoring and noticeable breathing pauses during sleep.
The condition is more prevalent among...

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Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea

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Can a single cephalometric measurement predict obstructive sleep apnea severity?

Atul Gulati¹, Robert A C Chate, Timothy Q Howes

¹Department of Sleep and Respiratory Medicine, Papworth Hospital, Papworth, UK. agulati47@gmail.com

Journal of Clinical Sleep Medicine : JCSM : Official Publication of the American Academy of Sleep Medicine

|March 3, 2010

Summary

This study found no link between hyoid bone position and obstructive sleep apnea (OSA) severity. The sella-hyoid (S-H) distance is not a reliable screening tool for OSA.

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Drug-Induced Sleep Endoscopy (DISE) with Target Controlled Infusion (TCI) and Bispectral Analysis in Obstructive Sleep Apnea

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Published on: November 4, 2025

Area of Science:

Dentistry
Orthodontics
Sleep Medicine

Background:

Obstructive sleep apnea (OSA) is a common sleep disorder.
Previous research suggested a correlation between hyoid bone position and OSA severity.
The sella-hyoid (S-H) distance is a cephalometric measurement used to assess hyoid bone verticality.

Purpose of the Study:

To investigate the association between the sella-hyoid (S-H) distance and the severity of obstructive sleep apnea (OSA).
To evaluate the potential of S-H distance as a screening tool for OSA.

Main Methods:

Retrospective study of 106 patients treated with mandibular advancement splint (MAS) for sleep disordered breathing.
Lateral cephalograms were analyzed to measure the S-H distance prior to MAS therapy.
Correlation analysis was performed between S-H distance and OSA severity (Apnea-Hypopnea Index).

Main Results:

The mean S-H distance was 125.5 mm.
No significant correlation was found between S-H distance and OSA severity (Pearson correlation coefficient = -0.034).
The S-H distance did not differ significantly across different levels of OSA severity.

Conclusions:

The vertical position of the hyoid bone, as measured by S-H distance, is not correlated with OSA severity.
S-H distance is not recommended as a substitute for established diagnostic tests for OSA.