Impact of nonstationarities on short heart rate variability recordings during obstructive sleep apnea
Articolo
Data di Pubblicazione:
2017
Citazione:
Impact of nonstationarities on short heart rate variability recordings during obstructive sleep apnea / V. Bari, L. Faes, D. Tonon, B. De Maria, G. Ranuzzi, G. Rossato, A. Porta. - In: COMPUTING IN CARDIOLOGY. - ISSN 2325-8861. - 44(2017), pp. 1-4. ((Intervento presentato al 44. convegno Computing in cardiology conference (CinC) tenutosi a Rennes (France) nel 2017 [10.22489/CinC.2017.203-166].
Abstract:
Obstructive sleep apnea (OSA) is a sleep disorder characterized by breathing pauses due to collapse of the upper airways. During OSA the autonomic modulation, as noninvasively assessed through heart period (HP) variability, is altered in a time-varying way even though time-varying properties of HP fluctuations are often disregarded by HP variability studies. We performed a time domain analysis computed over very short epochs corresponding to the sole OSA events explicitly accounting for HP variability nonstationarities. Length-matched epochs were extracted during OSA and quiet sleep (SLEEP) in 13 subjects suffering from OSA (11 males, age 55±11, apnea-hypopnea index 44±19). Mean HP, variance and variance of the residual after exponential detrending were assessed as well as the parameters a and b of the exponential fitting in the form y(n)=a·exp(b·n). HP mean and the parameter a increased during OSA compared to SLEEP. The variance of the residual was significantly lower than original variance during both OSA and SLEEP, while the dispersion of the parameter b was significantly larger. Nonstationarities were evident during both SLEEP and OSA but more dramatically apparent during OSA, thus stressing the need of accounting for them when the autonomic control during OSA is under scrutiny.
Tipologia IRIS:
01 - Articolo su periodico
Elenco autori:
V. Bari, L. Faes, D. Tonon, B. De Maria, G. Ranuzzi, G. Rossato, A. Porta
Link alla scheda completa: