Positional Obstructive Sleep Apnea and Periodic Limb Movements During Sleep: A Large Multicenter Study

Area of Science:

• Sleep Medicine
• Respiratory Medicine
• Neurology

Background:

• The interplay between positional obstructive sleep apnea (POSA) and periodic limb movements during sleep (PLMS) is not well understood.
• Obstructive sleep apnea (OSA) severity may influence the presence and characteristics of PLMS.

Purpose of the Study:

• To investigate the relationship between POSA, OSA severity, and PLMS.
• To explore potential underlying mechanisms connecting these sleep disorders.

Main Methods:

• Retrospective analysis of 6,140 participants undergoing polysomnography.
• Evaluation of periodic limb movement index (PLMI) and periodic limb movement with arousal index (PLMAI).
• Analysis of POSA's impact on PLMS metrics relative to OSA severity.

Main Results:

• Severe OSA participants had lower PLMI, PLMAI, and PLMS prevalence than mild/moderate OSA groups.
• Patients with POSA showed significantly higher PLMI, PLMAI, and PLMS prevalence compared to non-positional OSA.
• The association of POSA with increased PLMS was most pronounced in severe OSA patients.

Conclusions:

• POSA, particularly in severe OSA, is associated with a higher prevalence of PLMS.
• Clinical consideration of POSA and OSA diagnosis is recommended when significant PLMS is observed.
• Further research into the mechanisms linking POSA and PLMS is warranted.