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|Title: ||Detecção automática de eventos em sinais polissonográficos por meio de análise em tempo-frequência : aplicações à medicina do sono|
|Authors: ||Caseiro, Paulo Júlio Moreira, 1978-|
|Advisor: ||Andrade, Alexandre da Rocha Freire de, 1971-|
|Keywords: ||Apnéia do sono tipo obstrutiva|
Transformada de Hilbert-Huang
Teses de doutoramento - 2011
|Issue Date: ||2010|
|Abstract: ||Polysomnographic signals are recorded from patients exhibiting
symptoms related to sleep disorders. Obstructive sleep apnea (OSA) is one
of the most widely studied sleep disorders. The assessment of the type and
severity of a sleep disorder is usually based on manual identification and
classification of the registered events and manual scoring of sleep stages.
The usual procedure entails an overnight recording followed by the long and
hard stage of manual event classification.
This thesis presents a methodology to automatically detect sleep
stages, in accordance to American Academy Sleep Medicine (AASM) Visual
Scoring rules, using 30-second epochs taken from EEG and EMG signals.
The data are processed with Empirical Mode Decomposition - EMD Method,
and fed into an artificial neural network for purposed of classification.
A methodology for fast screening of OSA is also provided, based on
EMD decomposition of a 5-minute oronasal airway pressure signal
emanating from a polysomnographic recording during the awake period,
thus eschewing the need for an overnight recording.
Further tests will be needed to reproduce these results and optimize the
procedures, but the proposed methods seem to allow for: first, fast and
reliable sleep stage scoring; second, a fast method to screen OSA patients. The presented methodology shows potential for clinical application, in order
to reduce the costs and waiting times associated with the diagnosis of sleep
|Description: ||Apêndice 4 para consulta no Departamento de Documentação (P. Caseiroa; R. Fonseca-Pintoa; A. Andrade- "Screening of obstructive sleep apnea using Hilbert–Huang decomposition of
oronasal airway pressure recordings". Cota: Res. 16551)|
|Appears in Collections:||FC - Teses de Doutoramento|
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