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COD or Chemical Oxygen Demand definition. Chemical oxygen demand (COD) is a measure of the capacity of water to consume oxygen during the decomposition of organic matter and the oxidation of inorganic chemicals such as Ammonia and nitrite.
The determinants of tissue oxygenation are illustrated in Figure 13.1. The oxygen supply to tissues is shown as the rate of O2 uptake from the microcirculation (i.e., VO2). The metabolic requirement for oxygen (MRO2) is the rate at which oxygen is metabolized to water in the mitochondria.eonardo da Vinci, 1500. Despite good intentions, much of what we do to patients in the name of aerobic support is without documented need or documented benefit. This is a reflection of the inability to obtain a direct measurement of tissue oxygen tensions.