Effect of Pre-imaging on Cardiopulmonary Resuscitation (CPR) Pause

Patients presenting following out of hospital cardiac arrest will undergo bedside ultrasound as per the hospital clinical practice. Initial 6 months include recording of current state of practice and timing of pauses and timing of ultrasounds. The second 6 months will follow an educational intervention to teach "pre-imaging". This is the technique of imaging the heart during cardiopulmonary resuscitation (CPR) to find the heart and center it on the ultrasound screen before CPR is stopped. The goal is to decrease CPR pause times when ultrasound is performed post out of hospital (OOH) cardiac arrest.