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. Author manuscript; available in PMC: 2014 Aug 22.
Published in final edited form as: Lancet. 2013 Aug 2;383(9918):736–747. doi: 10.1016/S0140-6736(13)60734-5

Figure 1. An example of the signals recorded during overnight polysomnography.

Figure 1

Shows an obstructive apnoea with cessation of airflow for more than 10 s despite persistent respiratory efforts shown on the chest and abdominal respiratory bands. The apnoea is associated with arterial oxygen desaturation and is terminated by arousal from sleep. C4-A1=electroencephalogram. LOC=left electro-oculogram. ROC=right electro-oculogram. CHIN=chin electromyogram. CHEST=respiratory inductance plethysmography bands placed around the thorax. ABDM=respiratory inductance plethysmography bands placed around the abdomen. PNasal=airflow monitoring by nasal air pressure. Therm=airflow monitoring by thermal air sensor. SaO2=arterial oxygen saturation. EKG=electrocardiogram. ABDM=abdomen.