PT  - JOURNAL ARTICLE
AU  - Jade Vanbuis
AU  - Abdelkebir Sabil
AU  - Guillaume Baffet
AU  - Mathieu Feuilloy
AU  - Nicole Meslier
AU  - Frédéric Gagnadoux
TI  - Estimation of AHI using a single-channel EEG and home polygraphy signals
AID  - 10.1183/13993003.congress-2018.PA2247
DP  - 2018 Sep 15
TA  - European Respiratory Journal
PG  - PA2247
VI  - 52
IP  - suppl 62
4099  - http://erj.ersjournals.com/content/52/suppl_62/PA2247.short
4100  - http://erj.ersjournals.com/content/52/suppl_62/PA2247.full
SO  - Eur Respir J2018 Sep 15; 52
AB  - Objectives: In type III home polygraphy (HPG), Apnea Hypopnea Index (AHI) is calculated over the total recording time rather than the total sleep time (TST) as in polysomnography (PSG) and it is, therefore, underestimated. The aim of this study is to assess the impact of an automatic sleep/wake estimation algorithm on the AHI calculation.Methods: The study included 176 patients admitted to the sleep laboratory for a PSG recording. The sleep/wake estimation algorithm used a single lead EEG (FP2-A1) associated to HPG signals (tracheal sounds, nasal airflow, actimetry, light, respiratory inductive plethysmography and suprasternal pressure). AHI using the enhanced HPG (AHIHPG+) scoring was compared with manual AASM scoring of both HPG (AHIHPG) and PSG (AHIPSG). Based on the AHI, patients were diagnosed with mild, moderate or severe sleep apnea.Results: Cohen’s Kappa coefficient, sensitivity, specificity and the positive predictive value for the detection of wakefulness were 0.72, 78%, 94% and 78% respectively. TST estimation resulted in a better AHI assessment (Figure 1). In comparison to AHIPSG, a total of 54 patients were misclassified, using AHIHPG, as mild or moderate instead of moderate or severe. One third (18/54) of these patients would have been diagnosed properly based on AHIHPG+.Conclusions: Enhanced HPG using single lead EEG is an efficient and cost-effective method for TST estimation and AHI calculation.FootnotesCite this article as: European Respiratory Journal 2018 52: Suppl. 62, PA2247.This is an ERS International Congress abstract. No full-text version is available. Further material to accompany this abstract may be available at www.ers-education.org (ERS member access only).