Which of the following parameters is not typically monitored with a polysomnogram?
a. SaO2
b. Electroencephalogram (EEG)
c. Breathing effort
d. Exhaled PCO2
ANS: D
In a laboratory sleep study, several physiologic signals are recorded to determine whether airway closure occurs during sleep and to what extent the closure disturbs sleep continuity and cardio-pulmonary function. An electroencephalogram (EEG), electrooculogram (EOG), and chin elec-tromyogram (EMG) are obtained for assessment of sleep stage and documentation of sleep dis-ruption due to sleep-related breathing disturbance. Airflow (measured at nose and mouth), venti-latory effort (using inductive plethysmography or piezo belts), cardiac rhythm (with a modified lead II electrocardiogram), and oxygen saturation (measured with pulse oximetry) are included in the standard testing montage.
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