Scientific article

Cost-effectiveness of outpatient versus inpatient non-invasive ventilation setup in obesity hypoventilation syndrome: the OPIP trial

Published inThorax, vol. 78, no. 1, p. 24-31
First online date2022-09-02

Background: Current guidelines recommend that patients with obesity hypoventilation syndrome (OHS) are electively admitted for inpatient initiation of home non-invasive ventilation (NIV). We hypothesised that outpatient NIV setup would be more cost-effective.

Methods: Patients with stable OHS referred to six participating European centres for home NIV setup were recruited to an open-labelled clinical trial. Patients were randomised via web-based system using stratification to inpatient setup, with standard fixed level NIV and titrated during an attended overnight respiratory study or outpatient setup using an autotitrating NIV device and a set protocol, including home oximetry. The primary outcome was cost-effectiveness at 3 months with daytime carbon dioxide (PaCO2) as a non-inferiority safety outcome; non-inferiority margin 0.5 kPa. Data were analysed on an intention-to-treat basis. Health-related quality of life (HRQL) was measured using EQ-5D-5L (5 level EQ-5D tool) and costs were converted using purchasing power parities to £(GBP).

Results: Between May 2015 and March 2018, 82 patients were randomised. Age 59±14 years, body mass index 47±10 kg/m2 and PaCO2 6.8±0.6 kPa. Safety analysis demonstrated no difference in ∆PaCO2 (difference -0.27 kPa, 95% CI -0.70 to 0.17 kPa). Efficacy analysis showed similar total per-patient costs (inpatient £2962±£580, outpatient £3169±£525; difference £188.20, 95% CI -£61.61 to £438.01) and similar improvement in HRQL (EQ-5D-5L difference -0.006, 95% CI -0.05 to 0.04). There were no differences in secondary outcomes.

Discussion: There was no difference in medium-term cost-effectiveness, with similar clinical effectiveness, between outpatient and inpatient NIV setup. The home NIV setup strategy can be led by local resource demand and patient and clinician preference.

Trial registration numbers: NCT02342899 and ISRCTN51420481.

  • Non invasive ventilation
  • Humans
  • Middle Aged
  • Aged
  • Obesity Hypoventilation Syndrome / therapy
  • Noninvasive Ventilation / methods
  • Cost-Benefit Analysis
  • Quality of Life
  • Outpatients
  • Inpatients
  • Department of Health -
Citation (ISO format)
MURPHY, Patrick Brian et al. Cost-effectiveness of outpatient versus inpatient non-invasive ventilation setup in obesity hypoventilation syndrome: the OPIP trial. In: Thorax, 2022, vol. 78, n° 1, p. 24–31. doi: 10.1136/thorax-2021-218497
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Article (Published version)
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ISSN of the journal0040-6376

Technical informations

Creation03/13/2023 8:26:17 AM
First validation09/27/2023 7:03:31 AM
Update time09/27/2023 7:03:31 AM
Status update09/27/2023 7:03:31 AM
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