Figure 1 Polygraphy records of obstructive sleep apnoea (OSA) and central sleep apnoea (CSA) Figure 1 | Polygraphy records of obstructive sleep apnoea.

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Figure 1 Polygraphy records of obstructive sleep apnoea (OSA) and central sleep apnoea (CSA) Figure 1 | Polygraphy records of obstructive sleep apnoea (OSA) and central sleep apnoea (CSA). a | OSA is characterized by cessation or marked reduction of the airflow (Airflow band) in the presence of ventilatory effort (Thorax and Abdomen bands). b | CSA is characterized by cessation of both airflow (Airflow band) and respiratory effort (Thorax and Abdomen bands) during sleep. Snoring sounds and airflow were recorded with a nasal cannula; thoracic and abdominal muscle effort with piezoelectric strain gauges; oxygen saturation (SpO2), heart rate, and plethysmography (Plethysm.) with a finger cuff; and body position with an accelerometer. Parati, G. et. al. (2016) Heart failure and sleep disorders Nat. Rev. Cardiol. doi:10.1038/nrcardio.2016.71