PMC2954745_01
Polysomnographic recording (5 minutes tracing) of an HCM patient with normal left ejection fraction presenting a Cheyne-Stokes respiration during sleep. The patient was on stage 2 sleep; top channel is related to sleep recordings.  The following channels, from top to bottom, trac respiration by monitoring motion of the thorax, abdomen, respiratory flow (nasal canulla), ear lobe oxymetry, and derived heart rate. Black arrows show how the circulation time is measured (time from the first breath after a central apnea to the subsequent nadir of SaO2 detected at the ear by an oximeter).- Polysomnographic recording (5 minutes tracing) of an HCM patient with normal left ejection fraction presenting a Cheyne-Stokes respiration during sleep. The patient was on stage 2 sleep; top channel is related to sleep recordings.  The following channels, from top to bottom, trac respiration by monitoring motion of the thorax, abdomen, respiratory flow (nasal canulla), ear lobe oxymetry, and derived heart rate. Black arrows show how the circulation time is measured (time from the first breath after a central apnea to the subsequent nadir of SaO2 detected at the ear by an oximeter).
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CSR pattern of breathing was present during the entire night (Figure 1).