Update on the use of portable monitoring system for the diagnosis of sleep apnea in specific population

Table 1 Sleep evaluation studies for the diagnosis of sleep disordered breathing

	Type 1 full attended polysomnography	Type 2 full unattended polysomnography	Type 3 limited channels devices	Type 4 continuous single or dual bioparameter recording
Number of channels	Minimum 7	Minimum 7	Minimum 4	Minimum of 1
Parameters	EEG, EOG, chin EMG, ECG, airflow, respiratory effort, oxygen saturation	EEG, EOG, chin EMG, ECG, airflow, respiratory effort, oxygen saturation	Ventilation (at least two channels of respiratory movement or respiratory movement and airflow), heart rate or ECG, oxygen saturation	Usually oxygen saturation and/or airflow
Body position	Documented or objectively measured	May be objectively measured	May be objectively measured	Not measured
Leg movement	EMG or motion sensor desirable	EMG or motion sensor desirable	May be recorded	Not recorded
Personnel	In constant attendance	Not in attendance	Not in attendance	Not in attendance

Adapted from Ferber et al[8]. EEG: Electroencephalogram; EOC: Electrooculogram; EMG: Electromyogram; ECG: Electrocardiogram.