Format

Send to

Choose Destination
Sleep Breath. 2014 Sep;18(3):609-14. doi: 10.1007/s11325-013-0924-2. Epub 2014 Jan 19.

A pilot validation study for the NOX T3(TM) portable monitor for the detection of OSA.

Author information

1
SleepMed, Inc., 700 Gervais St. Suite 200, Columbia, SC, 29201, USA, acairns@sleepmedinc.com.

Abstract

PURPOSE:

The aim of the current pilot study is to compare the diagnostic accuracy of the NOX T3(TM) (T3) portable sleep monitor (PM) to that of simultaneously recorded in-lab polysomnogram (PSG).

METHODS:

A total of 40 participants were recruited following face-to-face evaluation at a sleep disorders clinic. Each participant wore both PSG and PM equipment simultaneously during their in-lab PSG. PSG records were manually scored using the American Academy of Sleep Medicine (AASM) criteria, and PM records were double-scored using the device's autoscore algorithm as well as manual scoring.

RESULTS:

The final sample consisted of 32 participants (56% male, 50% black) with a mean ESS, BMI, and apnea-hypopnea index (AHI) of 10.4, 32.8, and 16.3, respectively. Three participants (7.5%) were excluded for poor PM signal quality. Mean AHI derived from the T3's autoscore algorithm was similar to that from manual scoring (19.6 ± 18.9 vs. 18.6 ± 19.1, respectively). Autoscore-derived T3 AHI and PSG-derived AHI were strongly related (r = .93). The T3 (autoscored AHI) demonstrated a high degree of sensitivity for the presence of obstructive sleep apnea syndrome (OSA; 100%) and acceptable specificity for the exclusion of OSA using an AHI cutoff of ≥5 events/h (70%). The unit (autoscored) had a high degree of both sensitivity (92%) and specificity (85%) when the presence of OSA was defined more conservatively (AHI > 15 events/h). For OSA defined as an AHI of ≥5, the T3 (autoscored) correctly identified 88% of positive cases and 100% of negative cases.

CONCLUSIONS:

In this small, clinic-based sample, the T3 demonstrated very good measurement agreement compared to PSG and a high degree of sensitivity for detecting even mild OSA. False positives appeared to be due to respiratory effort-related arousals (RERAs) being autoscored as obstructive apneas and may be due to inherent discrepancy in flow measurement sensitivity between PSG and portable monitors.

PMID:
24442914
DOI:
10.1007/s11325-013-0924-2
[Indexed for MEDLINE]

Supplemental Content

Full text links

Icon for Springer
Loading ...
Support Center