Title :
Heart rate chaos in obstructive sleep apnea in children
Author :
Zapanta, L. ; Poon, C.-S. ; White, D.P. ; Marcus, C.L. ; Katz, E.S.
Author_Institution :
Dept. of Electr. Eng. & Comput. Sci., MIT, Cambridge, MA, USA
Abstract :
Obstructive sleep apnea syndrome (OSAS) in children is associated with a bradytachyarrhythmia during an obstructive event. Polysomnographic recordings were obtained from 15 children; 9 had OSAS (apnea/hypopnea index = 13.6 ± 8.2/hr, mean ± SD) and 6 normal controls. Heart rate variability was analyzed for the presence of chaotic dynamics. Using a 5-minute sliding window, chaos was detected using numerical titration technique. In both groups, REM had a higher chaotic intensity than NREM sleep (p < 0.05). Furthermore, chaos was significantly increased during periods with apneic events compared to stable breathing. These data indicate that sleep state and disordered breathing are important determinants of the autonomic control of heart rate chaos in children.
Keywords :
chaos; electrocardiography; medical signal processing; paediatrics; pneumodynamics; sleep; 5 min; NREM sleep; REM sleep; bradytachyarrhythmia; children; disordered breathing; heart rate chaos; heart rate variability; hypopnea; numerical titration technique; obstructive sleep apnea; polysomnographic recordings; sleep state; Chaos; Doped fiber amplifiers; Fluctuations; Heart rate; Heart rate variability; Pediatrics; Rail to rail inputs; Sleep apnea; Spectral analysis; Testing; Heart rate chaos; children; heart rate variability; nonlinear dynamics; obstructive sleep apnea;
Conference_Titel :
Engineering in Medicine and Biology Society, 2004. IEMBS '04. 26th Annual International Conference of the IEEE
Conference_Location :
San Francisco, CA
Print_ISBN :
0-7803-8439-3
DOI :
10.1109/IEMBS.2004.1404088
