{
  "abstract": "Introduction We reviewed the technical failure rates of 3 commercially available home sleep diagnostic kits to see what the key signal failure rates were. Signals were categorised into (OK) no failures, (Partial) partial failures (>1 hour but didn’t affect the clinical outcome overall and (Fail) fully failed which affected the study.Methods We audited 1156 routine home sleep studies across 4 sites to determine the failure rates of (i) Embletta (n=385 over 14 months), (ii) Smed (n=100 over 1.5 months) (iii) WatchPAT (n=671 over 17 months) devices. Channels included (if available*) oximetry, respiratory, snoring, thorax*, abdomen*, PAT* and body position using fail rates per total device studies.Results The signal fail rates figure 1(A-E). show Embletta oximetry signal was worst (15.7% partial and 4.7% full failure) (figure 1A) & the respiratory signal is the most likely to fail (figure 1B) especially in the Embletta and S-Med devices. All polygraphy devices failed less than 1% for Snoring (figure 1C) or position (figure 1D) signals. Abdomen/thorax signals (figure 1E) showed partial failure especially with the Embletta abdominal signal.Abstract P36 Figure 1Conclusions As expected, the most failed signals were oximetry and flow/respiratory traces. The WatchPAT flow failed least the WatchPAT finger probe rarely became dislodged. The Embletta oximetry and abdominal signals were the least reliable of all devices. However, the Embletta abdominal signal is often set up by the patient. The explanation for this is unclear and requires further investigation.Respiratory signals have the highest partial failure rates (15–30%) in the 3 systems, mainly due to abdominal/thorax probe failures.Full respiratory failure rates are around 1–8%.The Embletta had the worst oximeter fail rate (15.3%) but the WatchPAT failed least (0.7%).Snoring and position signals have virtually no failure rates on all devices.",
  "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": "Julie Lloyd"
    }
  ],
  "title": "P36 Audit of signal failure rate of commercially available home sleep diagnostics",
  "uid": "76882cfe-e762-5dea-a2c6-f41889e950b7"
}