Heart Rate Variability in Obstructive Sleep Apnea: Association with Excessive Daytime Sleepiness and Cardiovascular...

Area of Science:

• Cardiology
• Sleep Medicine
• Autonomic Nervous System Function

Background:

• Obstructive sleep apnea (OSA) is linked to increased autonomic nervous system activity and cardiovascular risks.
• Excessive daytime sleepiness (EDS) in OSA patients predicts mortality.
• Heart rate variability (HRV) assesses autonomic modulation, impacted by OSA.

Purpose of the Study:

• To investigate the association between HRV and daily sleepiness in OSA patients.
• To correlate sleepiness severity, measured by the Epworth Sleepiness Scale (ESS), with HRV metrics.

Main Methods:

• Seventy OSA patients were categorized into EDS (ESS ≥ 11) and non-sleepy (ESS < 11) groups.
• Time and frequency domain HRV parameters were analyzed.
• Data were compared between the two sleepiness groups.

Main Results:

• OSA patients with EDS exhibited elevated cardiovascular risk markers via HRV.
• Higher low-frequency (LF) and very low-frequency (VLF) HRV parameters were observed in EDS patients.
• Positive correlations were found between oxygen desaturation index (ODI) and apnea-hypopnea index (AHI) with VLF.

Conclusions:

• EDS in OSA patients is associated with increased cardiovascular risk, reflected in distinct HRV patterns.
• Specific HRV parameters (LF, VLF) are significantly higher in OSA patients with EDS.
• Further research is warranted to elucidate the HRV-sleepiness relationship in OSA.