Oxygen consumption is the rate at which oxygen is removed from the blood for use by the tissues. Oxygen delivery and consumption - Oxygen delivery is the rate of oxygen transport from the lungs to the peripheral tissues.
Measures of oxygenation are discussed below. Oxygenation - Oxygenation is the process of oxygen diffusing passively from the alveolus to the pulmonary capillary, where it mostly binds to hemoglobin in red blood cells (oxyhemoglobin) a small proportion directly dissolves into the plasma. Low levels of oxygen in the blood can result in hypoxemia or hypoxia. TERMINOLOGY - The process of taking oxygen from the inspired air and using it to sustain aerobic cellular metabolism throughout the body involves the following: (See "Oxygen delivery and consumption" and "Evaluation and management of the nonventilated, hospitalized adult patient with acute hypoxemia".) Oxygen delivery and consumption and management of acute hypoxemia are discussed separately. In this topic review, measures of oxygenation and mechanisms of hypoxemia are discussed. Identifying the main contributing mechanism to hypoxemia helps narrow the differential so that investigations and therapy are appropriately targeted. INTRODUCTION - Understanding the mechanisms of hypoxemia is critical for the evaluation of patients with hypoxemia.
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