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

Abstract

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.

• Authors: Patrick Brian Murphy, Maxime Patout, Gill Arbane, Swapna Mandal, Georgios Kaltsakas, Michael I Polkey, Mark Elliott, Jean-François Muir, Abdel Douiri, David Parkin, Jean-Paul Janssens, Jean Louis Pépin, Antoine Cuvelier, Clare Flach, Nicholas Hart
• Journal: Thorax (Thorax) Vol. 78 Issue 1 Pg. 24-31 (01 2023) ISSN: 1468-3296 [Electronic] England
• PMID: 36342884 (Publication Type: Randomized Controlled Trial, Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © Author(s) (or their employer(s)) 2023. No commercial re-use. See rights and permissions. Published by BMJ.

Topics

• Humans
• Middle Aged
• Aged
• Obesity Hypoventilation Syndrome (therapy)
• Noninvasive Ventilation (methods)
• Cost-Benefit Analysis
• Quality of Life
• Outpatients
• Inpatients