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    Ambulance smartphone tool for field triage of ruptured aortic aneurysms (FILTR): study protocol for a prospective observational validation of diagnostic accuracy

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    Author
    Lewis, Thomas L.
    Fothergill, Rachael cc
    Aneurysm-FILTR Study Group
    Karthikesalingam, Alan
    Keyword
    Emergency Medical Services
    Aortic Rupture
    Hospital Mortality
    Clinical Decision-Making
    Telephone
    Journal title
    BMJ Open
    
    Metadata
    Show full item record
    URI
    http://hdl.handle.net/20.500.12417/196
    DOI
    10.1136/bmjopen-2016-011308
    Abstract
    Introduction: Rupture of an abdominal aortic aneurysm (rAAA) carries a considerable mortality rate and is often fatal. rAAA can be treated through open or endovascular surgical intervention and it is possible that more rapid access to definitive intervention might be a key aspect of improving mortality for rAAA. Diagnosis is not always straightforward with up to 42% of rAAA initially misdiagnosed, introducing potentially harmful delay. There is a need for an effective clinical decision support tool for accurate prehospital diagnosis and triage to enable transfer to an appropriate centre. Methods and analysis: Prospective multicentre observational study assessing the diagnostic accuracy of a prehospital smartphone triage tool for detection of rAAA. The study will be conducted across London in conjunction with London Ambulance Service (LAS). A logistic score predicting the risk of rAAA by assessing ten key parameters was developed and retrospectively validated through logistic regression analysis of ambulance records and Hospital Episode Statistics data for 2200 patients from 2005 to 2010. The triage tool is integrated into a secure mobile app for major smartphone platforms. Key parameters collected from the app will be retrospectively matched with final hospital discharge diagnosis for each patient encounter. The primary outcome is to assess the sensitivity, specificity and positive predictive value of the rAAA triage tool logistic score in prospective use as a mob app for prehospital ambulance clinicians. Data collection started in November 2014 and the study will recruit a minimum of 1150 non-consecutive patients over a time period of 2 years. Ethics and dissemination: Full ethical approval has been gained for this study. The results of this study will be disseminated in peer-reviewed publications, and international/national presentations https://bmjopen.bmj.com/content/6/10/e011308.long 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/ http://dx.doi.org/10.1136/bmjopen-2016-011308
    ae974a485f413a2113503eed53cd6c53
    10.1136/bmjopen-2016-011308
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