Background: Diagnosis of obstructive rest apnea syndrome (OSAS) by ambulatory methods is a growing practice in view of the large number of patients awaiting correct diagnosis.
Background: Diagnosis of obstructive rest apnea syndrome (OSAS) by ambulatory methods is a growing practice in view of the large number of patients awaiting correct diagnosis. The Watch PAT100 (WP100) [Itamar Medical; Caesarea, Israel] is a portable device based in succession the peripheral arterial tone (PAT) signal, and is designed for unattended family circle sleep studies.
Objectives: To evaluate the efficacy, reliability, and reproducibility of the WP100 device for the diagnosis of OSAS as compared to in-laboratory, standard polysomnographic-based manual scoring.
Design and methods: undivided hundred two subjects (78 men; 69 patients with OSAS and 33 normal volunteers; mean [+ or -] SD age, 414 [+ or -] 152 years; corpse mass index, 26.8 [+ or -] 55) underwent in-laboratory sated polysomnography simultaneously with WP100 recording. Fourteen make submissives also underwent two additional unattended hearthstone sleep studies with the WP100 alone. The polysomnography recordings were blindly scored for apnea/hypopnea according to the American Academy of nap Medicine criteria (1999), and the polysomnography respiratory disturbance index (RDI) [PSG-RDI] was calculated. The WP100 data were analyzed automatically for the PAT RDI (PRDI) by dint of a proprietary algorithm that was previously exhibited on an independent group of subjects
Results: Across a wide range of RDI on a levels the PRDI was highly correlated with the PSG-RDI (r = 088 p < 00001) with an area beneath the receiver operating characteristic turn of 0.82 and 0.87 for beginnings of 10 events per hour and 20 terminations per hour, respectively. The PRDI scores were also highly reproducible, showing high correlation between to one's home and in-laboratory sleep studies (r = 089 p < 0001)
Conclusion: The WP100 may present an accurate, robust, and reliable ambulatory regularity for the detection of OSAS, with minimal patient discomfort. (CHEST 2003; 123:695-703)
tonic words: ambulatory; automatic analysis; obstructive be dead apnea syndrome; peripheral arterial tone; respiratory disturbance index; sleep
Abbreviations: ASDA = American be motionless Disorders Association; AUC = area below the curve; BMI = corpse mass index; ESS = Epworth sleepiness scale; OSAS = obstructive nap apnea syndrome; PAT = periheral arterial tone; PRDI = peripheral arterial tone respiratory disturbance index; PSG-RDI = polysomnogpraphy respiratory disturbance index; RDI = respiratory disturbance index; ROC = receiver operating characteristic; WP100 = Watch PAT100
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Obstructive rest apnea syndrome (OSAS) is considered to be a major public health question The prevalence of OSAS is estimated at 2% and 4% for adult women and men respectively, principally of whom are undiagnosed and untreated. (1) The in-laboratory lie in the grave study using full polysomnography and the manual scoring criteria place by the American Academy of lie in the grave Medicine is considered the "gold standard" for OSAS diagnosis. (2) The severity of the disorder is exhibited as the respiratory disturbance index (RDI), which is the number of apneas/hypopnea terminations per hour of sleep. The high richness of in-laboratory, full-night polysomnography, together with extended waiting lists for sleep studies, have l to the commonly used transaction of "split-night" for patients with OSAS, as well as to the growth of a variety of ambulatory rest study systems. (3)
The earliest ambulatory devices were based upon overnight pulse oximetry alone, an easy and simple technology for diagnosing OSAS. (4) However, it has been shown that the beating [i]or[/i] throbbing of an artery oximeter suffers from limited accuracy. (56) Portable well stocked [i]or[/i] provided polysomnography and other multiple-channel ambulatory devices are at short intervals complex and cumbersome. (7)
The American be motionless Disorders Association (ASDA) has classified nap study systems into four categories: horizontal 1, in-laboratory attended standard polysomnography; flat 2, unattended home sleep thought with comprehensive portable devices incorporating the same channels as the in-laboratory standard polysomnography; horizontal 3, unattended devices, which measure at least four cardiorespiratory parameters; plain 4, unattended devices recording the same or two parameters. (8)
The Watch PAT100 (WP100) [Itamar Medical; Caesarea, Israel] is a four-channel unattended ambulatory device (level 3) based forward the peripheral arterial tone (PAT) signal with three additional channels: heart rate (derived from the PAT signal), throb oximetry, and actigraphy (both are embedded in the device). The PAT signal measures the arterial pulsatile turn changes of the finger that are regulated according to the [alpha]-adrenergic innervation of the unruffled muscles of the vasculature of the finger, and thus ponders sympathetic nervous system activity. (9) The WP100 indirectly discovers apnea/hypopnea events by identifying swells of sympathetic activation associated with the termination of these affairs This information is further combined with heart rate and beating [i]or[/i] throbbing of an artery oximetry data that are analyzed from the automatic algorithm of the theory (which was developed on a prior cluster of patients). This detects respiratory ends and calculates the PAT RDI (PRDI).
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