{
  "abstract": "Introduction We reviewed the failure rates of 3 commercially available sleep home diagnostic systems as well as oximetry and attended polysomnography to identify key channel failure rates and overall study failure rates. Studies were categorised into (OK) no significant failures, (Partial) partial failures (>1 channels failed for >1 hour but didn’t affect the study outcome and (Fail) fully failed causing study outcome.Methods We audited 2433 home sleep studies across all sites to determine the failure rates of Embletta (n=385 over 14 months), S-Med (n=100 over 1.5 months), WatchPAT (n=671 over 17 months) and Smed PSG (n=592 over 13 months). Channels included (if available*) oximetry, flow/respiratory, snoring, thorax*, abdomen*, PAT* and body position. Studies with no data collected or a short study (<4 hrs) were also included. Fail rates were fails per device.Results The technical outcomes are shown in figure 1(A-D). Simpler studies with fewer sensors had less fails (figure 1A) and were similar to the PSG attended studies. Both Embletta and S-Med polygraphy had most partial fails. Oximetry (figure 1B) was the most likely cause of partial failures being worse in the Embletta and S-Med devices. Polygraphy devices had <2.5% data collection failure (figure 1C) issues or short studies (figure 1D) < 5% on all devices. As expected, attended PSG studies had least fails, and the most common failed signals were oximetry and airflow/respiratory traces.Abstract P27 Figure 1Conclusions Total failure rates in home polygraphy are usually under 5%.Partial failure rates are around 40%, but this doesn’t mean a repeat study is required.The simpler the unattended system the lower the fail rate.Data failure and short studies happen in only about 3%–5% of home sleep studies.",
  "authors": [
    {
      "affiliations": [
        "University Hospitals Birmingham, Birmingham, UK"
      ],
      "name": "Brendan Cooper"
    },
    {
      "affiliations": [
        "University Hospitals Birmingham, Birmingham, UK"
      ],
      "name": "Alison Butler"
    },
    {
      "affiliations": [
        "University Hospitals Birmingham, Birmingham, UK"
      ],
      "name": "Richard Glover"
    },
    {
      "affiliations": [
        "University Hospitals Birmingham, Birmingham, UK"
      ],
      "name": "Jodie Hunt"
    },
    {
      "affiliations": [
        "University Hospitals Birmingham, Birmingham, UK"
      ],
      "name": "Theresa Cunnington"
    },
    {
      "affiliations": [
        "University Hospitals Birmingham, Birmingham, UK"
      ],
      "name": "James Stockley"
    },
    {
      "affiliations": [
        "University Hospitals Birmingham, Birmingham, UK"
      ],
      "name": "Laura Smith"
    },
    {
      "affiliations": [
        "University Hospitals Birmingham, Birmingham, UK"
      ],
      "name": "Mindi Daniels"
    },
    {
      "affiliations": [
        "University Hospitals Birmingham, Birmingham, UK"
      ],
      "name": "Julie Lloyd"
    }
  ],
  "title": "P27 Audit of home sleep study failure rate compared to full polysomnography",
  "uid": "300f1dba-68c7-5ede-83aa-af43c52450dd"
}