Sleep Diagnostics

Alice PDx

Portable sleep diagnostic system

The Alice PDx portable diagnostic recording device is intended for Obstructive Sleep Apnea screening, follow-up and diagnostics in polysomnography and sleep disorder studies. Patients can be tested in the hospital or at home.

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Winner of MDEA Award || Award-winning design

Winner of MDEA Award confirms design excellence

The Alice PDx Portable Sleep System was a winner in the 2010 Medical Design Excellence Awards (MDEA) competition, in the category of general hospital devices and therapeutic products. This award recognizes features that provide enhanced benefits to their patients. The Alice PDx is easy for patients to set up and use in the comfort and privacy of their home.
Color-coded labels for intuitive sens... || Easy to use

Color-coded labels for intuitive sensor placement

The Alice PDx device interface is easy to use, easy to understand and informative. There are color-coded labels located around the perimeter of the device that indicate where to connect the various sensors. The display shows the patient only the sensors that need to be connected. The sensor information and indicators help your patients place the sensors correctly and reduce the need for re-testing due to application errors. There is a helpful, color-coded, step-by-step diagram is included with the Alice PDx system to walk patients through the appropriate application process. The base configuration channel set supports testing requirements for levels three and four and includes: Nasal pressure cannula, Oral thermistor, zRIP abdominal and chest belts, SpO2, Body position.
Good Study Indicator || Broad capabilities

Good Study indicator confirms quality data recorded

The Alice PDx incorporates our unique Good Study Indicator (GSI). The GSI is predicated on airflow and oximeter signal quality and displays the amount of “good quality data” needed for a study to be complete and valid. The GSI visually displays the amount of good quality data in 25-percent increments on the Alice PDx display screen. This information allows the clinician to decide if the patient needs to repeat the study. If the study needs to be repeated, the provider can educate the patient remotely on how to apply the sensors better.
Sleepware G3 with Somnolyzer || Easy to use

Sleepware G3 with Somnolyzer

The Alice PDx is powered by Sleepware G3, the same software used for our other Alice family in-lab PSG and portable sleep diagnostic devices. Sleepware G3 is a robust platform with enhanced functionality to help busy sleep labs better meet their business and workflow needs, regardless of their lab size.
Optional ECG and ExG Yokes || Broad capabilities

Optional ExG and ECG for level 2 testing

When level II testing is needed, the Alice PDx can be interfaced to optional ECG and ExG sensor interface yokes. The ECG yoke consists of five electrode inputs, considered in cardiology to be a three-lead ECG. This provides three measured and four derived ECG channels to help assess sleep apnea in patients with possible cardiac comorbidities. The Alice PDx optional ECG yoke can provide one-, six- and seven-channel configurations. The optional ExG yoke provides 13 inputs to provide four EEG/EOG channels and three EMG channels, including ground and references. This enables level-two application for advanced sleep analysis.
Multi-Night Recording || Easy to use

Multi-night recordings

With the SD card memory and two- to three-night battery life, the Alice PDx can collect information from multi-night recordings when needed. The Alice PDx can be set to start and stop recording automatically to minimize the risk of the patient forgetting to set it.
Alice PDx allows for on-line signal d... || Easy to use

Alice PDx allows for on-line signal display during recording

Alice PDx can be connected directly to a computer running Sleepware G3 during acquisition to view waveforms as they are being recorded. The allows the clinician to view the quality of signals being collected.

Specifications Show all

Physical characteristics
5 L x 3 W x 2 H (12.7 x 7.62 x 5.08) "/cm
Approximately 8 oz (230 grams), weight does not include batteries
Total channels
Up to 21 with Optional EXG and ExG Yokes channels
Standard channels
Pressure Based (w/snore) and Thermal Airflow, zRIP Effort (2), Body Position, SpO2 (also Pleth and Pulse Rate), Respironics Therapy Device Parameters, Pressure and Flow from non-respironics therapy devices. channels
Optional Yokes/Channels (a)
ECG Yoke; 3-lead ECG providing 3 measured and 4 derived channels for a total of 7 channels
Optional Yokes/Channels
ExG Yoke: 4 Neuro Channels (EEG or EOG) and 3 Differential EMG, plus references and ground.
Input impedance
10 Mω per Electrode 20 Mω differential
2 Mω per Electrode 4 Mω differential
2 Mω per Electrode 4 Mω differential
ECG (a)
0.318 to 81 Hz
0.318 to 35 Hz
9.7 to 86 Hz
Input Signal Range
± 4 mV
± 500 µV
± 150 µV
Digital Resolution
Up to
16 bits
Initial Sample Rate
Up to
1 Hz
Max Storage Rate
200 Hz
Effort and Thermal Flow
100 Hz
Pressure Flow
200 Hz
500 Hz
Body Pos.
1 Hz
Communication interfaces
Serial Protocol
USB PC cable
SleepLink and Serial
communication cables for our therapy devices
System Power Requirements
Alkaline batteries
Three AA (1.5V) 0.43 watts typical