The variability of the apnoea-hypopnoea index

The variability of the apnoea-hypopnoea index

Autor Bittencourt, Lia Rita Azeredo Autor UNIFESP Google Scholar
Suchecki, Deborah Autor UNIFESP Google Scholar
Tufik, Sergio Autor UNIFESP Google Scholar
Peres, Clovis de Araujo Autor UNIFESP Google Scholar
Togeiro, Sonia Maria Autor UNIFESP Google Scholar
Bagnato, Maurício da Cunha Autor UNIFESP Google Scholar
Nery, Luiz Eduardo Autor UNIFESP Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Resumo This study was designed to evaluate the variability of the apnoea-hypopnoea index (AHI) in 20 patients with obstructive sleep apnoea-hypopnoea syndrome (OSAHS) and to determine possible relationships of this variability with other polysomnographic parameters. the subjects were recorded on four consecutive nights. the mean AHI values were not significantly altered throughout the four recording nights (P = 0.67). the intraclass correlation coefficient of the AHI on the four nights was 0.92. However, the Bland and Altman plot showed that, individually, the AHI presented an important variability, which was not related to its initial value. in regard to the OSAHS severity, 50% of the patients changed the classification from the first to the subsequent nights. Thirteen of the 20 patients (65%) presented a variation in the AHI value equal or higher than 10 events h(-1). When we evaluated the AHI mean values for a specific body position and sleep stage, no difference was observed among the nights. in both supine and lateral-ventral decubitus, higher AHI was observed during Stages 1 and 2 than the other stages. Additionally, the AHI during Stages I and 2 and REM sleep was higher on the supine than on the lateral-ventral decubitus. the AHI in OSAHS patients presented a good correlation among the four recording nights; however, a significant individual variability should be considered, especially when AHI is applied in OSAHS classification or as a criterion of therapeutic success.
Palavra-chave apnoea/hypopnoea index
obstructive sleep apnoea/hypopnoea syndrome
Idioma Inglês
Data de publicação 2001-09-01
Publicado em Journal of Sleep Research. Oxford: Blackwell Science Ltd, v. 10, n. 3, p. 245-251, 2001.
ISSN 0962-1105 (Sherpa/Romeo, fator de impacto)
Publicador Blackwell Science Ltd
Extensão 245-251
Direito de acesso Acesso aberto Open Access
Tipo Artigo
Web of Science WOS:000170906900010
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