• best evidence topic reports
• chest pain
• croup
• overdose
• abdominal colic
• endotracheal tube

Best evidence topic reports (BETs) summarise the evidence pertaining to particular clinical questions. They are not systematic reviews, but rather contain the best (highest level) evidence that can be practically obtained by busy practicing clinicians. The search strategies used to find the best evidence are reported in detail in order to allow clinicians to update searches whenever necessary. The BETs published below were first reported at the Critical Appraisal Journal Club at the Manchester Royal Infirmary¹ or placed on the BestBETs web site. Each BET has been constructed in the four stages that have been described elsewhere.² The BETs shown here together with those published previously and those currently under construction can be seen at http://www.bestbets.org.³ Six BETs are included in this issue of the journal. • Diamorphine or morphine for ischaemic cardiac chest pain • Type of oral corticosteroid in mild to moderate croup • Glucagon in tricyclic overdose • Colourimetric CO₂ detector compared with capnography for confirming endotracheal tube placement • Glucagon for the treatment of symptomatic β blocker overdose • Buscopan (hyoscine butylbromide) in abdominal colic