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Systemic arterial blood pressure during obstructive sleep apnoea.
Journal of Sleep Research
|June 1, 1995
Summary
Cardiovascular changes during obstructive sleep apnea (OSA) are linked to chemical factors and sleep state, not just breathing effort. Blood pressure rises at apnea termination, correlating with arousal, not CO2 levels.
Area of Science:
- Cardiology
- Sleep Medicine
- Neurophysiology
Background:
- Obstructive sleep apnea (OSA) involves complex cardiovascular changes.
- The interplay between mechanical, chemical, and neurophysiological factors during apneas is not fully understood.
Purpose of the Study:
- To investigate the relationship between cardiovascular changes and other physiological processes during obstructive apneas.
- To understand the influence of breathing effort, gas exchange, and sleep state on blood pressure fluctuations in OSA patients.
Main Methods:
- Studied 18 OSA patients during NREM sleep.
- Monitored non-invasive arterial blood pressure, oxygen saturation (SaO2), end-tidal CO2 (ETCO2), intrathoracic pressure (Ppl), and EEG frequency.
- Analyzed data during different phases of the apnea event.
Main Results:
- Blood pressure initially fell, stabilized, then rose sharply at apnea termination.
- Increased blood pressure at end-apnea correlated with decreased SaO2 but not ETCO2 changes.
- Blood pressure changes were weakly linked to inspiratory effort but influenced by chemical factors and sleep state changes, particularly arousal.
Conclusions:
- Arterial pressure changes during OSA are minimally dependent on inspiratory effort intensity.
- Chemical factors and sleep state modifications significantly influence blood pressure dynamics during apneas.
- Cardiovascular markers effectively indicate arousal responses in OSA during NREM sleep.