Visual and automatic cyclic alternating pattern (CAP) scoring

Abstract

A B S T R A C T -The classification of short duration events in the EEG during sleep, as the A stage of the cyclic a l t e rnating pattern (CAP) is a tedious and error prone task. The number of events under normal conditions is large (several hundreds), and it is necessary to mark the limits of the events with precision, otherwise the time sensitive classification of the CAP phases (A and B) and specially the scoring of diff e rent types of A phases will be compromised. The objective of this study is to verify the feasibility of visual CAP scoring with only one channel of EEG, the evaluation of the inter-s c o rer agreement in a variety of re c o rd i n g s , and the comparison of the visual scorings with a known automatic scoring system. Sixteen hours of one channel (C4-A1 or C3-A2) of NREM sleep were extracted from eight whole night re c o rdings in Euro p e a n Data Format and presented to the diff e rent scorers. The average inter-s c o rer agreement for all scorers is above 70%, the pair wise inter-scorer agreement found was between 69% up to 77.5%. These values are similar to what has been reported in different type studies. The automatic scoring system has similar performance of the visual scorings. The study also has shown that it is possible to classify the CAP using only one channel of EEG.KEY WORDS: cyclic alternating pattern, CAP, sleep, visual scoring, automatic scoring. Estagiamento visual e automático do padrão alternante cíclico (CAP)RESUMO -A classificação dos eventos de curta duração no EEG durante o sono, como a fase A do padrão a l t e rnante cíclico (CAP) é tarefa tediosa e propensa ao erro. O número de eventos é geralmente grande (centenas ao milhar), e é necessário marcar os limites dos eventos com precisão, caso contrário tanto a classificação das duas fases do CAP como a distinção dos diferentes tipos de fases A podem ser compro m e t idas. O objetivo deste estudo é a avaliação da concordância inter-e s t a g i a d o res no CAP tanto visual quanto automático usando um único canal de EEG, a avaliação do acordo inter-e s t a g i a d o res em uma variedade das gravações, e a comparação das classificações visuais com um sistema classificador automático. Dezesseis horas de um canal (C4-A1 ou C3-A2) do sono de NREM foram extraídas de oito gravações inteiras da noite no Formato de dados Europeus e apresentadas a diferentes classificadores, o acordo médio inter-e s t ag i a d o res para todas as classificações está acima de 70%, o acordo inter-e s t a g i a d o res do par encontrado e n t re 69% até 77,5%. Estes valores são similares ao que foi relatado nos diferentes tipos de estudos. O sistema marcador automático tem o desempenho similar aos dos classificadores visuais. O estudo também mostrou que é possível classificar o CAP usando somente um canal de EEG. PALAVRAS-CHAVE: padrão alternante cíclico, CAP, sono, estagiamento visual, estagiamento automático.The classification of short duration events in sleep EEG like the A phase of the cyclic alternating patt e rn 1 (CAP) is a tedious and error ...

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