RT Journal Article
SR Electronic
T1 A short daytime test using correlation dimension for respiratory movement in OSAHS
JF European Respiratory Journal
JO Eur Respir J
FD European Respiratory Society
SP 885
OP 890
DO 10.1183/09031936.04.00044104
VO 23
IS 6
A1 M. Miyata
A1 N. Burioka
A1 T. Sako
A1 H. Suyama
A1 Y. Fukuoka
A1 K. Tomita
A1 S. Higami
A1 E. Shimizu
YR 2004
UL http://erj.ersjournals.com/content/23/6/885.abstract
AB In order to examine the pathology in patients with obstructive sleep apnoea/hypopnoea syndrome (OSAHS), the nonlinear properties of respiratory movement and breath-to-breath variations during resting wakefulness with eyes closed was investigated. Recording of the respiratory movement using inductive plethysmography was performed on 14 patients with OSAHS and 13 control subjects for 2 h in the supine position during daytime. To calculate the correlation dimension (D2) for respiratory movement, an algorithm proposed by Grassberger and Procaccia was applied. The indices of breath-to-breath variations were estimated. To calculate D2 and breath-to-breath variations, two different segments were selected (200 s each). The value of D2 for respiratory movement in patients with OSAHS was significantly greater than that in control subjects. In the case of ≥2.0 of D2 for respiratory movement, the sensitivity and specificity of detecting the presence of OSAHS was 85.7% and 76.9%, respectively. On the basis of breath-to-breath variations, only the coefficient of variation of expiratory time for respiratory movement in patients with OSAHS was significantly greater than that in the control subjects. In conclusion, the measurements of correlation dimensions for respiratory movement with a brief period during wakefulness may be a useful index for identifying patients with obstructive sleep apnoea/hypopnoea syndrome.