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Polygraphy system

Polygraphy system

Different technologies calculate their indices differently and rely on different parameters. While it is essential to compare the indices of each device, it is not clear how useful each one is. ApneaGraph(r) Spiro was deemed reliable for detecting OSA, but overscored in the low range, giving false positives. However, in a recent study by Collop et al., this technology was found to have 100% sensitivity and specificity.

The three main physiological processes are heart rate, respiratory rate, and electrodermal activity. These processes are all important for human health. This article will explore how these different systems measure blood pressure. The appendix summarizes the scientific knowledge on these processes. In short, the heart rate, respiratory rate, and blood oxygenation are the three most important determinants of the quality of a polygraph. During an upright position, the arterial pressure will fall unexpectedly and the EEG will show an increase in activity.

The RDI indices of two devices cannot be interpreted directly. Each device records an event differently and their reliability depends on its algorithm. For example, PSG RERA scores a 10-s flow limitation with accompanying arousal. Similarly, ApneaGraph (r) Spiro RERA is calculated based on a 10-s flow limitation ending in increased activity. The results from these studies show that the RDI indices of these two devices are highly comparable.

Various methods have been developed and used to diagnose OSA. Among these, cardiorespiratory polygraphy has shown high sensitivity and specificity. The sensitivity and specificity of portable cardiorespiratory monitoring devices have varied. Therefore, the present study included the number of patients who had no home studies and was also limited by the presence of missing studies. The agreement between AHI and RDI was assessed by the Bland and Altman method.

The ApneaLink Plus device is battery-operated, has a sampling rate of 100 Hz, and has 16-bit signal processor. It allows for up to 10 hours of data collection. The device was demonstrated and participants were provided with an iconographic instruction guide on how to use it. A computer program was used to analyze the data. The software allowed for multiple simultaneous recordings of the same patient. It is a battery-operated system, but it can also be used with a PC.

Despite recent recommendations that suggest the use of portable home respiratory polygraphy systems as a primary diagnosis for OSAS, they are widely used in France. In the present study, the home respiratory polygraphy was not an effective method for identifying severe OSAS. In contrast, a full-blown sleep laboratory study revealed that a similar number of patients were diagnosed with OSA using a portable home respiratory system. The results showed that the HRP could detect severe OSAS in eight out of seven patients.

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