Hypoxia is a state of low oxygen levels in the blood.  Determining hypoxia using a pulse oximeter or arterial blood gasses (ABGs). A goal of ACLS is to recognize signs of hypoxia and provide timely treatment to prevent an arrest. Examples of some things that might lead us to think of hypoxia as a cause of cardiac arrest. Why we should not rely on pulse ox to give accurate readings during CPR. Delivering ventilations with near 100% oxygen concentration using a BVM attached to supplemental O2 and a reservoir. Using end tidal waveform capnography to assess the quality of CPR. Changes to ventilation rates, tidal volume, and O2 concentration affects a patient's oxygen, carbon dioxide, and pH. The danger of excessive ventilation of a patient in cardiac arrest. Connect with me: Website:  https://passacls.com @PassACLS on X (formally known as Twitter) @Pass-ACLS-Podcast on LinkedIn Give back - buy Paul a bubble tea here Good luck with your ACLS class!