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Obstructive sleep-disordered breathing with a dominant cyclic alternating pattern--a recognizable polysomnographic
Robert J Thomas1, Mario G Terzano, Liborio Parrino
1Division of Pulmonary Critical Care and Sleep Medicine, Department of Medicine, Beth Israel Deaconess Medical Center, Boston, Mass 02215, USA. rthomas1@bidmc.harvard.edu
Sleep
|May 6, 2004
Summary
A unique form of sleep apnea, termed CAP-dominant sleep-disordered breathing, shows severe obstruction during non-REM sleep but is mild during REM sleep. This condition may require treatments beyond standard positive airway pressure.
Area of Science:
- Sleep Medicine
- Respiratory Physiology
- Neurology
Background:
- Obstructive sleep-disordered breathing (OSDB) is common, but variants may present unique clinical and polysomnographic features.
- Understanding these variants is crucial for accurate diagnosis and effective treatment.
Purpose of the Study:
- To define the clinical and polysomnographic characteristics of a specific OSDB variant with mild symptoms during rapid eye movement (REM) sleep.
- To identify potential underlying mechanisms and treatment implications for this distinct syndrome.
Main Methods:
- Observational study analyzing polysomnographic and clinical records of 35 subjects with severe OSDB.
- Respiratory events were scored using nasal pressure, and sleep stages were analyzed with standard criteria and cyclic alternating pattern (CAP).
- Positive airway pressure titration was performed to assess treatment response.
Main Results:
- A distinct syndrome, CAP-dominant sleep-disordered breathing, was identified, characterized by severe obstructive events during non-REM sleep and mild events during REM sleep.
- Subjects exhibited lower BMI, fewer apneas, and reduced hypoxic burden compared to typical OSDB.
- Respiratory instability emerged selectively during CAP, leading to partial treatment failure with positive airway pressure.
Conclusions:
- This OSDB variant may involve a combination of respiratory instability, periodic breathing, and upper-airway obstruction.
- Conventional global respiratory indexes may not fully capture the complexity of this condition.
- Treatment may necessitate addressing periodic breathing components in addition to positive airway pressure.