Please use this identifier to cite or link to this item: https://hdl.handle.net/10216/110295
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dc.creatorRocha, AP
dc.creatorAlmeida, R
dc.creatorLeite, A
dc.creatorSilva, MJ
dc.creatorSilva, ME
dc.date.accessioned2019-02-02T19:20:53Z-
dc.date.available2019-02-02T19:20:53Z-
dc.date.issued2014
dc.identifier.othersigarra:110688
dc.identifier.urihttps://repositorio-aberto.up.pt/handle/10216/110295-
dc.description.abstractDysfunctions of the autonomic nervous system in critically ill patients with Acute Brain Injury (ABI) lead to changes in Heart Rate Variability (HRV) which appear to be particularly marked in patients subsequently declared in Brain Death (BD). HRV series are non-stationary, exhibit long memory in the mean and time-varying conditional variance (volatility), characteristics that are well modeled by AutoRegressive Fractionally Integrated Moving Average (ARFIMA) models with Generalized AutoRegressive Conditional Heteroscedastic (GARCH) errors. The long memory is estimated by the parameter d of the ARFIMA-GARCH model, whilst the time-varying conditional variance parameters, u and v characterize, respectively, the short-range and the persistence in the conditional variance. In this work, the ARFIMA-GARCH approach is applied to HRV series of 15 pediatric patients with ABI admitted in a pediatric intensive care unit, 5 of which has BD confirmed and 9 patients survived. The long memory and time-varying conditional variance parameters estimated by ARFIMA-GARCH modeling significantly differ between groups and seem able to contribute to characterize disease severity in children with ABI.
dc.language.isoeng
dc.relation.ispartof2014 COMPUTING IN CARDIOLOGY CONFERENCE (CINC), VOL 41
dc.rightsopenAccess
dc.titleLong-term HRV in critically ill pediatric patients: coma versus brain death
dc.typeArtigo em Livro de Atas de Conferência Internacional
dc.contributor.uportoFaculdade de Economia
dc.contributor.uportoFaculdade de Ciências
dc.identifier.authenticusP-00G-C2J
Appears in Collections:FCUP - Artigo em Livro de Atas de Conferência Internacional
FEP - Artigo em Livro de Atas de Conferência Internacional

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