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    Incidence of acute respiratory failure cases in West Midlands Ambulance Service (WMAS) – sub-study of ACUTE (ambulance CPAP: use, treatment effect and economics) trial

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    Author
    Gunson, Imogen M.
    Herbert, Esther
    Fuller, Gordon W.
    Keyword
    Pre-hospital Care
    Emergency Care
    Respiration
    Respiratory Insufficiency
    Emergency Medical Services
    Journal title
    Emergency Medicine Journal
    
    Metadata
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    URI
    http://hdl.handle.net/20.500.12417/675
    DOI
    10.1136/emermed-2019-999abs.26
    Abstract
    Background Acute respiratory failure (ARF) is a life-threatening emergency and pre-hospital CPAP may improve outcomes. A CPAP cost-effectiveness determinant is the incidence of eligible patients with ARF. This sub-study of the ACUTE trial aimed to determine the number of adults with ARF potentially suitable for CPAP, presenting to WMAS. Methods This observational study was conducted between 1stAugust 2017 and 31st July 2018. Adult patients presenting with SpO2 <94% were identified from WMAS electronic patient records. Electronic filters applied ACUTE trial inclusion and exclusion criteria, with subsequent manual clinical review by a research paramedic. A second research paramedic checked a sub-sample for inter-rater agreement. Overall and monthly incidence rates were calculated, census data provided the population denominator. Results 108,391 potential patients were identified from electronic patient records (EPR), after filter application 4,526 cases were eligible for review (Figure 1). After review, 1017 cases were considered CPAP candidates. Inter-rater agreement was 86%. Overall incidence was 17.35 per 100,000 population per year (95%CI 16.3–18.5). Marked seasonal variation was present, increasing over winter (Figure 2). Urban areas had the highest proportion of eligible patients (67.6% v 18.3% Rural v 14.2% semi-rural); and 53.0% of all eligible were male. Conclusions The incidence of eligible ARF patients impacts on the cost-effectiveness of pre-hospital CPAP, but previous reports have been variable, using sub-optimal methods or from non-UK settings. We report a valid NHS estimate of 17 patients per 100,000 who do not respond to current pre-hospital ARF management and could be candidates for CPAP., https://emj.bmj.com/content/36/10/e11.3. This is an Open Access article distributed in accordance with the Creative Commons Attribution Non Commercial (CC BY-NC 4.0) license, which permits others to distribute, remix, adapt, build upon this work non-commercially, and license their derivative works on different terms, provided the original work is properly cited and the use is non-commercial. See: http://creativecommons.org/licenses/by-nc/4.0/ DOI http://dx.doi.org/10.1136/emermed-2019-999abs.26
    ae974a485f413a2113503eed53cd6c53
    10.1136/emermed-2019-999abs.26
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    Publications - West Midlands Ambulance Service

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