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Clinical Insights

Cheyne Stokes Syndrome diagnosed with a 3D oximeter

A patient with severe heart failure had a resting SpO2 values ​​at the lower limit of normal , but had brief episodes of desaturation ( SpO2 falls ) as if hypo ventilated.

He also reported wheezing for minimal effort and episodes of nocturnal awakenings with a sense of suffocation.

He performed a 3D oximetry test during his sleep with a particular oximeter equiped with an accelerometer that allows the phases of movement (ie awake) to be distinguished by presumed sleep periods and to identify the positions taken during the sleep just as a polysomnography does.

The result was surprising: at first glance the plot suggested the presence of typical rapid desaturation sleep apnea syndrome (OSAS ).

Fig. 1 – Sleep oximetry : tracing the entire night.

However, performing the analysis by position something particularly sensational emerged. In the early hours of recording the patient was awake (as he confirmed), in motion (the accelerometer has registered more than 800 paths distance traveled).

Fig. 2 – Sleep oximetry: complete analysis of the position and movement (paths).

Rapid and serious desaturation occurred  not only during the sleep but also while he was awake and walking.

Fig. 3 – Most particular whilst the subject is awake and standing on his feet and walking.

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