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

Table 2 Scoper categorization

Sleep	Cardiovascular	Oximetry	Position	Effort	Respiratory
S1-3 EEG channels1 + EOG + chin EMG	C1-More than 1 ECG lead	O1-Oximetry (ear or finger) with recommended sampling2	P1-Video or visual position measurement	E1-Two RIP belts	R1-Nasal pressure and thermal device
S2-Less than 3 EEG channels with/without EOG or chin EMG	C2-Peripheral arterial tonometry	O1x-Oximetry (ear or finger) without recommended sampling	P2-Nonvisual position measurement	E2-One RIP belt	R2-Nasal pressure
S3-Sleep surrogate: e.g., actigraphy	C3-Standard ECG measure (one lead)	O2-Oximetry with alternative site		E3-Derived effort	R3-Thermal device
S4-Other sleep measure	C4-Derived pulse	O3-Other oximetry		E4-Other effort measures	R4-End-tidal CO2
	C5-other cardiac measures				R5-Other respiratory measures

¹Frontal, central and occipital;

²3 s averaging and a minimum of 10 Hz sampling rate. Adapted from Collop et al[9]. EEG: Electroencephalogram; EOC: Electrooculogram; EMG: Electromyogram; RIP: Respiratory inductance plethysmography.