Cardiac arrest is the leading cause of death among people over 40. The treatment for cardiac arrest is CPR or defibrillation. The trick is to catch cardiac arrest quickly in order to treat the patient immediately, because the mortality rate for cardiac arrest victims increases by 10% for every minute that action is not taken. To monitor for cardiac arrest, EKG machines or SPO2 monitors are used, but these devices exhibit inaccuracies. This new cardiac arrest monitoring device uses ultrasound Doppler technology to monitor the carotid artery, which allows for quick and accurate recognition of cardiac arrest.