Methods
We searched five bibliographic databases from 1946 to 20 April 2020 for
studies about the diagnosis, management and prevention of anaphylaxis.
We included 50 studies with 18,449 participants: 29 randomised
controlled trials, seven controlled clinical trials, seven consecutive
case series and seven case-control studies. Findings were summarised
narratively because studies were too heterogeneous to conduct
meta-analysis.