Blood pressure and cardiovascular parameters during sleep arousals

Area of Science:

• Cardiology
• Sleep Medicine
• Physiology

Background:

• Sleep arousals are transient awakenings during sleep.
• Arousals can be associated with pathological conditions.
• Their influence on cardiovascular parameters requires detailed investigation.

Purpose of the Study:

• To investigate the impact of various sleep arousals on blood pressure and Heart Rate Variability (HRV).
• To analyze changes in Diastolic Blood Pressure (DBP), Systolic Blood Pressure (SBP), Pulse Transit Time (PTT), and HRV frequency components (HF, LF).

Main Methods:

• Continuous monitoring of DBP, SBP, PTT, and HRV (HF, LF) during sleep.
• Development of the Slope Index (SI) to assess feature trends (ascending/descending).
• Calculation of Slope Index Positive Percentage (SIPP) to quantify the likelihood of parameter increases during arousals.

Main Results:

• During arousals, SIPP for DBP, SBP, and LF increased significantly (57.2%, 57.4%, 78.9% respectively) compared to pre-arousal levels.
• SIPP for PTT and HF decreased during arousals, indicating a higher probability of a drop.
• High SIPP for DBP and SBP (approx. 76%) suggests sleep arousals can induce sudden blood pressure surges.

Conclusions:

• Sleep arousals demonstrably influence cardiovascular dynamics.
• Specific arousal types correlate with significant increases in blood pressure and alterations in HRV components.
• Findings highlight the potential of sleep arousals to trigger acute hypertensive responses.