Sir,

We read with interest a meta-analysis published in Prehospital and Disaster Medicine titled “The Effect of Prehospital Epinephrine in Out-of-Hospital Cardiac Arrest: A Systematic Review and Meta-Analysis.”^{Reference Ng and Teoh1} The authors included two randomized control trials totaling to 8,548 patients in the final analysis. We would like to congratulate the authors for their work. However, we have the following observation to make. Three studies titled: “Dynamic Effects of Adrenaline (Epinephrine) in Out-of-Hospital Cardiac Arrest with Initial Pulseless Electrical Activity (PEA)” by Nordseth, etal;^{Reference Nordseth, Olasveengen, Kvaløy, Wik, Steen and Skogvoll2} “Intravenous Drug Administration During Out-of-Hospital Cardiac Arrest, A Randomized Trial” by Olasveengen, etal;^{Reference Olasveengen, Sunde, Brunborg, Thowsen, Steen and Wik3} and “High Dose and Standard Dose Adrenaline do not Alter Survival, Compared with Placebo, in Cardiac Arrest” by Woodhouse, etal^{Reference Woodhouse, Cox, Boyd, Case and Weber4} were randomized control trials studying the effect of epinephrine administration on out-of-hospital cardiac arrest as compared to placebo. The authors have excluded these studies from the final analysis in the present meta-analysis. Since these studies have contradicting results, their inclusion in the final analysis may alter the final conclusion of the meta-analysis.