![]() alveolar dead space the difference between anatomical dead space. the portions of the respiratory tract that are ventilated but not perfused by pulmonary circulation. V d V t = P A C O 2 − P e C O 2 P A C O 2 Ī common step is to then presume that the partial pressure of carbon dioxide in the end-tidal exhaled air is in equilibrium with that gas' tension in the blood that leaves the alveolar capillaries of the lung. a space remaining in the tissues as a result of failure of proper closure of surgical or other wounds, permitting the accumulation of blood or serum. The original formulation by Bohr, required measurement of the alveolar partial pressure P A. The Bohr equation is used to quantify the ratio of physiological dead space to the total tidal volume, and gives an indication of the extent of wasted ventilation. It differs from anatomical dead space as measured by Fowler's method as it includes alveolar dead space. This is given as a ratio of dead space to tidal volume. ![]() Physiological dead space (PaCO2 PECO2)/PaCO2. Conditions that create a ‘dead space effect’ are (a) high V/Q units in a heterogenous lung, and (b) shunt. The causes of true dead space are (a) anatomical dead space and (b) alveolar dead space. The Bohr equation, named after Danish physician Christian Bohr (1855–1911), describes the amount of physiological dead space in a person's lungs. Dead space represents the volume of ventilated air that does not participate in gas exchange. Not to be confused with the Bohr model or the Bohr effect.
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