• Britt Overland, Harriet Akre, Hanne Berdal, and Olav Skatvedt.
• Sleep Unit, Department of Otorhinolaryngology/Head and Neck surgery, Lovisenberg Diakonale Hospital, Oslo, Norway. brov@lds.no
• Acta Otolaryngol. 2012 Jan 1; 132 (1): 90-5.

ConclusionNocturnal groaning has the same prevalence in patients referred for diagnosis of sleep-disordered breathing as among other populations referred for sleep studies. The respiratory tracings in these patients have a distinct appearance that is possible to recognize with a polygraphic recording and thereby prevent the pattern from being misdiagnosed as central apneas.ObjectivesThe aim of this study was first to estimate the prevalence of groaning in patients referred for diagnosis of sleep-related breathing disorders. Second, we wanted to describe the respiratory pattern in order to distinguish the patients from patients with sleep apnea.MethodsThis was a prospective study in 1004 patients, performed in the Sleep Unit in our ENT Department, during a 12 month period.ResultsFour patients were diagnosed with video polysomnography, and the diagnosis of nocturnal groaning was confirmed. The prevalence of groaning in our sleep laboratory was 0.4%. All the patients had a mild form of sleep-related disturbance, and all groaning episodes occurred during REM sleep. The groaning events appeared in clusters. The length of each groan varied between 4 and 38 s. The number of events in a period varied between 2 and 11, and the length of each groaning period ranged between 11 and 168 s.

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