BackgroundThe treatment of pediatric heart arrest includes, among other procedures, the defibrillation. However the optimal dose is unknown to do it. ObjectiveTo evaluate the evidence on defibrillation doses should be employed in the pediatric patient. MethodologyWe conducted a systematic review of the literature search through the databases PUBMED, OVID, EMBASE and LILACS and registration of clinical trials in the United States of any methodological design in animals or humans to explore the loading dose to be used in defibrillation. We performed a qualitative analysis of the extracted information and summary measures. ResultsWe found three cohort studies and an animal model to report results. Based on available evidence it can be argued that the initial loading dose of 2 J / kg used today reported lower rates of efficacy than the historical. On the other hand no evidence is available that allows to understand which is the optimal loading dose to be used. Conclusión There is no evidence on the optimal loading dose should be used in the defibrillation of pediatric patients. Should be designed and conducted observational studies and clinical trials which can respond to this questionKeywords (MeSH): Defibrillation, heart arrest, cardiopulmonary resuscitation, systematic review as a topic.