Abstract Background Maintaining effective oxygenation throughout the process of Pre-Hospital Emergency Anaesthesia (PHEA) is critical. There are multiple strategies available to clinicians to oxygenate patients both prior to and during PHEA. The optimal pre-oxygenation technique remains unclear. and it is unknown what techniques are being used by United Kingdom Helicopter Emergency Me... https://parisnaturalfoodes.shop/product-category/magnesium-oil/