New physiological bench test reproducing nocturnal breathing pattern of patients with sleep disordered breathing

PLoS One. 2019 Dec 5;14(12):e0225766. doi: 10.1371/journal.pone.0225766. eCollection 2019.

Abstract

Previous studies have shown that Automatic Positive Airway Pressure devices display different behaviors when connected to a bench using theoretical respiratory cycle scripts. However, these scripts are limited and do not simulate physiological behavior during the night. Our aim was to develop a physiological bench that is able to simulate patient breathing airflow by integrating polygraph data. We developed an algorithm analyzing polygraph data and transformed this information into digital inputs required by the bench hardware to reproduce a patient breathing profile on bench. The inputs are respectively the simulated respiratory muscular effort pressure input for an artificial lung and the sealed chamber pressure to regulate the Starling resistor. We did simulations on our bench for a total of 8 hours and 59 minutes for a breathing profile from the demonstration recording of a Nox T3 Sleep Monitor. The simulation performance results showed that in terms of relative peak-valley amplitude of each breathing cycle, simulated bench airflow was biased by only 1.48% ± 6.80% compared to estimated polygraph nasal airflow for a total of 6,479 breathing cycles. For total respiratory cycle time, the average bias ± one standard deviation was 0.000 ± 0.288 seconds. For patient apnea events, our bench simulation had a sensitivity of 84.7% and a positive predictive value equal to 90.3%, considering 149 apneas detected both in polygraph nasal simulated bench airflows. Our new physiological bench would allow personalizing APAP device selection to each patient by taking into account individual characteristics of a sleep breathing profile.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acceleration
  • Algorithms
  • Humans
  • Linear Models
  • Physiology / methods*
  • Polysomnography
  • Respiration*
  • Signal Processing, Computer-Assisted
  • Sleep Apnea Syndromes / physiopathology*
  • Time Factors

Associated data

  • Dryad/10.5061/dryad.55nc054

Grants and funding

Air Liquide Healthcare provided support in the form of salaries for authors SL, YR, AS, SH, whereas SL was also a recipient of a doctoral fellowship (CIFRE: Conventions Industrielles de Formation par la Recherche) from Association Nationale de la Recherche et de la Technologie (ANRT, Paris, France). The funders did not have any additional role in the study design, data collection and analysis, decision to publish, or preparation of the manuscript. The specific roles of these authors are articulated in the ‘author contributions’ section.