The Esprit Nova™ System comparison
The Esprit Nova™ System
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The Esprit Nova™ System


Comparison of types of sleep monitoring devices available on the market (L1-L4)
L1 – Monitoring devices perform in-lab, technician-attended, overnight polysomnography

L2 ( Esprit Nova) Monitoring devices can perform full PSG outside of the
laboratory. The major difference from type 1 devices is that a technologist is not present. These devices are called comprehensive portable devices.

L3 - Monitoring devices do not record the signals needed to determine sleep stages or sleep disruption

L4 - These devices are called continuous single, or dual bio-parameter devices
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Esprit Nova™ vs. other HST devices
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Only by monitoring the brain activity of the patient (EEG) it is possible to obtain:
  • Accurate sleep architecture
  • Microarousals
  • Accurate AHI

Only by monitoring the muscular activity (EMG) it is possible to:
  • detect movement disorders
  • classify microarousals

Only by monitoring eye movements (EOG ) it is possible to achieve accurate REM detection

Only by monitoring the ECG it is possible to detect cardiac arrhythmias

Only by monitoring abdominal, thoracic effort and air-flow it is possible to discriminate central and obstructive respiratory events
Devices that do not monitor one of the above signals do not provide a complete picture of sleep and have a variable systematic error of the method, that depends on the combination of signals that are being ignored e.g. accurate apnea detection is not possible without monitoring the brain activity.
Apnea-only testing systems have a systematic error of the method that affects the diagnostic of apnea
Replacing the Total Sleep Time (TST) by Total Recording Time (TRT) in the calculation of the AHI and removing the detection of microarousals results in error in diagnosis in 24/37 (64%) of cases:

Mild apnea would have been considered normal in 11 out of 20 cases

Moderate apnea would have been considered mild in 10 out of 11 cases

Severe apnea would have been considered moderate in 3 out of 6 cases

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Error in the estimation of AHI (events/h) by ignoring TST and microarousals (N=60).