Sleep disorders in pregnancy

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FIGURE 1
Example of respiratory polygraphy in a patient with obstructive sleep apnoea. Episodes of obstructive events followed by hypopnoea events.

TABLE 1

Types of sleep studies

Test	Equipment and parameters
Video polysomnography (Requires a specialist centre)	Electroencephalography: monitors cortical brain activity Electromyography: monitors muscle activity, leg movements Electrooculography: monitors eye movements Electrocardiogram: monitors cardiac rhythm Heart rate Oximetry: monitors oxygen levels in blood Nasal and oral airflow: monitors respiratory flow Respiratory inductance plethysmography: monitors respiratory effort Body position Microphone: monitors snoring Video
Respiratory polygraphy/ limited channel sleep study (Can be performed in hospital or at home)	Oxygen saturation Heart rate Nasal ± oral airflow Respiratory inductance plethysmography Body position Snoring Electromyography (may not be available in some studies)
Overnight pulse oximetry (Can be performed at home)	Oxygen saturation Heart rate