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<p>Reversible Causes of Cardiac Arrest - 4Hs and 4Ts: Hypoxaemia This is the first explainer in a series of eight, outlining reversible causes of cardiac arrest. What is Hypoxaemia? Hypoxaemia is the reduction in the values for partial pressure of oxygen dissolved in arterial blood (PaO2) and arterial oxygen saturation (SaO2) (Pruitt, 2004). Pa02 is best measured by arterial blood gas (ABG) analysis, while SaO2 can be routinely assessed using a non-invasive test called pulse oximetry. During nursing assessment, hypoxaemia should be considered if a patient has a respiratory rate greater than 24 per minute, and arterial oxygen saturations (SaO2) </p>