{
  "abstract": "Introduction In line with recent guidance, home oximetry can be used when access to respiratory polygraphy studies is limited (NICE 2021). The COVID-19 pandemic put pressure onto diagnostic waiting times (NHS 2023), meaning more patients were listed for home oximetry and multi-channel limited polygraphy studies compared with pre-pandemic levels.As polygraphy analysis can be more time-consuming, it was proposed that using auto-analysis for home oximetry may ease pressures and give physiologists more time for polygraphy analysis.Aim Is it appropriate to auto-analyse oxygen desaturation index (ODI) in home oximetry?Methods In studies between May and August 2024, the automated ODI on download and the ODI after manual analysis were recorded on Microsoft Excel. Scoring of events was measured as ≥4% dip in%SpO2 using Masimo Rad-97 oximeters (Visi-Download – Stowood Scientific Instruments Ltd). A paired t-test assessed for any statistical difference between auto- and manual-analysed ODI, significance was accepted at p<0.05.Results 149 oximetry studies were analysed, ODI >10 was considered as significant for treatment (SIGN 2003). Within the local sleep service, ODI ≥ 15 automatically proceeded to treatment. There was no significant difference between overall auto- and manual- analysed ODI (p=1.66).Generally, manual analysis increased ODI from the downloaded value. Out of 101 data points where ODI >5 events/hour, 97 saw ODI increase after manual analysis (Δ&xbar; 2.01 events/hour). Only 4 saw ODI decrease (<-1 event/hour) which didn’t cross any clinically significant boundaries. (Figure 1)Conclusions As manual analysis tends to increase ODI, auto-analysis of ODI 7–15 would be inappropriate due to proximity to clinically significant thresholds. Using auto-analysis outside of those ranges is appropriate due to negligible changes that wouldn’t affect onward treatment. Using auto-analysis when appropriate will allow physiologists more time for analysing polygraphy studies.Abstract P26 Figure 1Auto- vs manual-analysis plotted against the y-axis of ODI with 2 solid lines to show the markers of ODI 10, and ODI 15 (events/hour)References National Institute for Health and Care Excellence. (2021). Obstructive sleep apnoea/hypopnoea syndrome and obesity hypoventilation syndrome in over 16s [NICE Guidelines No. NG202]. https://www.nice.org.uk/guidance/ng202 NHS Diagnostic Waiting Times and Activity Data. (2023). Available at: https://www.england.nhs.uk/statistics/wp-content/uploads/sites/2/2023/05/DWTA-Report-March-2023_OLEX2.pdf [Accessed 23 Jan. 2025, page 6]. Scottish Intercollegiate Guidelines Network. (2003). Management of Obstructive Sleep Apnoea/Hypopnoea Syndrome in Adults [National Clinical Guideline No. 73]. https://britishsnoring.co.uk/pdf/sign73.pdf",
  "authors": [
    {
      "affiliations": [
        "South Tyneside and Sunderland NHS Foundation Trust, Sunderland, UK"
      ],
      "name": "Katie Rutterford"
    },
    {
      "affiliations": [
        "South Tyneside and Sunderland NHS Foundation Trust, Sunderland, UK"
      ],
      "name": "Peter Muse-Ray"
    }
  ],
  "title": "P26 Is it appropriate to perform auto-analysis in home oximetry studies?",
  "uid": "925dacf7-89af-5121-9f0d-b33b704e3ce2"
}