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Respiratory challenge induces high frequency spiking on the static charge sensitive bed (SCSB)
T Kirjavainen1, O Polo, S McNamara
1Dept of Physiology, University of Turku, Finland.
The European Respiratory Journal
|September 1, 1996
Summary
High-frequency spikes on a static charge sensitive bed (SCSB) during sleep are not from cardiac activity. These spikes indicate respiratory effort and can measure breathing stimulation, supporting SCSB use in sleep studies.
Area of Science:
- Respiratory Physiology
- Sleep Medicine
- Biomedical Engineering
Background:
- The static charge sensitive bed (SCSB) is a noninvasive tool for detecting sleep apnea.
- High-frequency spiking on SCSB in heavy snorers is linked to partial upper airway obstruction, but its origin is unclear.
Purpose of the Study:
- To investigate the mechanism behind SCSB high-frequency spiking during breathing challenges in awake subjects.
Main Methods:
- Monitored oxygen saturation, end-tidal carbon dioxide, ventilation, esophageal pressure, ECG, blood pressure, and SCSB signals in six volunteers.
- Subjects underwent free breathing, hypoxia, hypercapnia, and inspiratory/expiratory loading.
Main Results:
- During quiet breathing, SCSB signals correlated with the cardiac cycle (ballistocardiogram).
- During respiratory challenges, SCSB spikes were linked to breathing phases (inspiration/expiration), not the cardiac cycle.
- Spike amplitude correlated with breathing frequency and esophageal pressure variations.
Conclusions:
- SCSB high-frequency signals represent cardiac activity during quiet breathing.
- Respiratory-generated spikes during high-drive breathing indicate fast respiratory movements.
- SCSB spiking is a valid noninvasive measure of breathing stimulation.