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P046 GP based oximetry as an initial diagnostic test for obstructive sleep apnoea (OSA), outcomes
  1. Kieran Lee and
  2. Ian Smith
  1. Royal Papworth Hospital, Cambridge Biomedical Campus


Introduction For >5 years we have offered a pathway for suspected OSA using a questionnaire and home-oximetry distributed from GP surgeries with interpretation and advice from the sleep centre. We reviewed one year’s activity to see if this ‘off-tariff’ pathway delivers whole-system health economy savings.

Methods Mean ESS and ODI (from home-oximetry) were extracted for referrals on the pathway in 2017–18. Individual charges to the CCG were taken from the hospital finance system. We modelled the cost of home respiratory polygraphy (RP) as an alternative first test, assuming a higher rate of first appointment discharges.

Results We found that 628/5127 (13.3%) of our new referrals came through the GP pathway. The cost to the CCG of each oximetry alone was £99. Patients seen in clinic after oximetry were charged as new patients (£276) and the oximetry became ‘free’. RP was charged at £350 with a follow up appointment at £110 and full polysomnography as an inpatient averaged £762.

228 people (36.3%) were immediate discharges with advice and no clinic appointment (ODI 4, ESS 9.3); 192 started CPAP, 121 after oximetry (ODI 38, ESS 13.5) and 71 after a further sleep test. All discharged patients were given lifestyle advice and invited to seek re-referral if symptoms persisted/deteriorated. The cost with this system to diagnose a person with OSA needing CPAP was £989. An initial RP (modelled with 50% immediate discharges) would have cost £1464 per CPAP starter. The total saving is estimated at £91281 p.a. equivalent to 48% of the current cost.

Conclusion Our OSA pathway reduces travel for patients, as more than a third do not need to attend the hospital. Even with conservative assumptions it offers considerable savings to the local health economy reducing the cost to diagnose a patient with significant OSA by almost a third.

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