Introduction
Traumatic brain injury (TBI) is a major public health concern affecting approximately 150–300 per 100,000 persons annually in Europe.1 The World Health Organization has predicted that TBI will be one of the leading causes of death and disability worldwide by the year 2020.2
The care for patients with TBI is often complex and multidisciplinary. Guidelines, protocols, and care pathways have been developed to improve quality of care, to reduce variation in practice, and to ensure that evidence-based care is optimally implemented.3
A 2013 systematic review4 found that the use of protocols in the management of severe TBI in the intensive care unit (ICU) led to improved patient outcomes. The findings, however, were based on observational studies that did not report on adherence rates. Without an understanding of adherence rates, the improved outcomes stated in the review cannot be directly attributed to the use of protocols.
Guideline adherence can be defined as the proportion of patients treated according to a guideline recommendation, which often represents evidence-based or best practice care. Previous studies have found that guideline adherence in medicine is generally low5–7 and varies widely across centers,7,8 medical condition,9 types of guideline,10,11 and time period.8,10 As a result, many patients do not receive evidence-based care, while others receive unnecessary care that may even be harmful.5To date, no systematic review of the literature about guideline adherence in TBI has been conducted.
The aim of this systematic review was to provide a comprehensive overview of professionals’ adherence to guidelines in adult patients with TBI. The objectives were threefold:
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1. To quantify adherence to guidelines in adult patients with TBI.
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2. To explore factors influencing adherence to TBI guidelines in those studies reporting on adherence.
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3. To examine the association between adherence to guidelines and outcome in patients with TBI in those studies reporting on adherence.

