central sleep apnea syndrome primary central sleep apnea syndrome SCTID:9741000119101 ICD10CM:G47.31 MEDGEN:148385 ICD9:327.21 A central sleep apnea syndrome considered to be idiopathic. Central sleep apnea is caused by improper signaling from the brainstem to the respiratory muscles and is triggered by either hypoventilation or hyperventilation. Clinical signs include snoring, insomnia or hypersomnia, difficulty concentrating, and fatigue. Recurrent episodes of hypoxia/hypoxemia have long-term detrimental effects on cardiovascular health. UMLS:C0751762 primary central sleep apnea MONDO:0024356