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Central Sleep Apnea Syndrome
Definition 1
A broad classification of disorders which includes 6 subtypes (primary central sleep apnea, central sleep apnea due to Cheyne-Stokes breathing pattern, central sleep apnea due to medical condition not Cheyne-Stokes, central sleep apnea due to high-altitude periodic breathing, central sleep apnea due to drug or substance and primary sleep apnea of infancy) that are each characterized by interruptions in breathing while asleep. It is caused by improper signaling from the brainstem to respiratory muscles and is triggered by either hypoventilation or hyperventilation. In adults, this disorder may arise following a stroke, congestive heart failure, trauma, infection or the use of narcotic medications. It is more common in older males and may present as a co-morbid condition to obesity. Clinical signs include snoring, insomnia or hypersomnia, difficulty concentrating and fatigue. Recurrent episodes of hypoxia/hypoxemia have long-term detrimental effects on cardiovascular health. (NCI Thesaurus)
Definition 2
A condition associated with multiple episodes of sleep apnea which are distinguished from obstructive sleep apnea (SLEEP APNEA, OBSTRUCTIVE) by the complete cessation of efforts to breathe. This disorder is associated with dysfunction of central nervous system centers that regulate respiration. This condition may be idiopathic (primary) or associated with lower brain stem lesions; chronic obstructive pulmonary disease (LUNG DISEASES, OBSTRUCTIVE); HEART FAILURE, CONGESTIVE; medication effect; and other conditions. Sleep maintenance is impaired, resulting in daytime hypersomnolence. Primary central sleep apnea is frequently associated with obstructive sleep apnea. When both forms are present the condition is referred to as mixed sleep apnea (see SLEEP APNEA SYNDROMES). (Adams et al., Principles of Neurology, 6th ed, p395; Neurol Clin 1996;14(3):611-28) (NLM, Medical Subject Headings)
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