Original Article

Sleep and Breathing

, Volume 15, Issue 2, pp 229-235

Sound analysis of catathrenia: a vocal expiratory sound

  • Jorge IriarteAffiliated withSleep Unit, University Clinic of Navarra, University of NavarraClinical Neurophysiology Section, Department of Neurology, University Clinic of Navarra, University of Navarra Email author 
  • , Secundino FernándezAffiliated withENT Department, University Clinic of Navarra, University of Navarra
  • , Natalia Fernandez-ArrecheaAffiliated withENT Department
  • , Elena UrrestarazuAffiliated withSleep Unit, University Clinic of Navarra, University of Navarra
  • , Inmaculada PagolaAffiliated withSleep Unit, University Clinic of Navarra, University of Navarra
  • , Manuel AlegreAffiliated withSleep Unit, University Clinic of Navarra, University of Navarra
  • , Julio ArtiedaAffiliated withSleep Unit, University Clinic of Navarra, University of Navarra

Rent the article at a discount

Rent now

* Final gross prices may vary according to local VAT.

Get Access

Abstract

Purpose

Catathrenia (nocturnal groaning) is a rare and relatively little-understood parasomnia. The characteristics of the sound and the recordings are not similar in all the relevant research papers. Indeed, there is currently some discussion regarding whether or not this is a single entity. For some authors, catathrenia is a particular form of parasomnia; for others, it may be a variant of snoring or a respiratory problem. The goal is to establish whether or not catathrenia may be regarded as an expiratory vocal sound. An attempt was made to classify the origin of this sound according to its sound structure.

Methods

We present the sound analysis of two patients, a man and a woman, with clinically diagnosed catathrenia and we compared them with the analysis of snoring. We use the spectrogram and the oscillogram. We classified the sounds according to the Yanagihara criteria.

Results

The vocal nature of the sound was confirmed, and several significant differences to some snoring sounds were discovered. The analysis of the catathrenia samples demonstrated that these signals are type II according to Yanagihara classification; these signals had a very short jitter, and had formants and harmonics. However, snoring is a type III, very irregular and had formants but not harmonics.

Conclusions

The oscillogram and the spectrogram in these patients show that the origins of the sounds are clearly different: catathrenia is laryngeal, while snoring is guttural. Catathrenia cannot be considered as expiratory snoring.

Keywords

Catathrenia Sound analysis Snoring