Rule of 4's: Safe and effective pleural decompression and chest drain insertion in severely injured children. Teague WJ et Al. Emerg Med Australas. 2019 Apr 30. doi: 10.1111/1742-6723.13299. The intersecting scenarios of multi-trauma, thoracic injury and traumatic cardiac arrest present some of the most demanding moments in paediatric trauma. For these reasons, decision support through teamwork, checklists, technology and guidelines are central to ensuring quality paediatric trauma care. The 'Rule of 4's' is a simple aide-memoire, which guides clinicians of all...