Rapid reviews differ from systematic reviews in that the process is tailored for a shorter timeline, but it is still important to use rigorous methodology to ensure that the best available research evidence is used in decision making.
The methods of conducting rapid reviews varies widely, and are typically done in less than 5 weeks. Often policy makers require a short deadline and a systematic review for synthesizing the evidence is not practical, so this is a better option.
Rapid Reviews may be best designed for:
New or emerging research topics, updates of previous reviews, critical topics, to assess what is already known about a policy or practice using some systematic review methods.
Limitations:
(Source: Cochrane: Rapid Reviews-An Introduction, 2014)
Timeframe: Typically, less than 5 weeks (varies) *Varies beyond the type of review. Depends on many factors such as but not limited to: resources available, the quantity and quality of the literature, and the expertise or experience of reviewers" (Grant et al. 2009)
Question: Narrow question, may use a review framework
Sources and searches: Sources are limited due to time constraints of searching, however still uses transparent and reproducible search methods.
Selection: Based on inclusion/exclusion criteria
Appraisal: Critical and rigorous but time limited
Synthesis: Descriptive summary or categorization of data, may still be quantitative
(Source: Khangura S. et al. (2012) Evidence summaries: the evolution of a rapid review approach)