If both patients have anatomical dead space of 200 m l, who has better alveolar ventilation?8/25/2023 ![]() Now, all you have to do is plug the numbers into the formula:ĭead space is an important concept to understand when it comes to respiratory physiology. What is the deadspace to tidal volume ratio? Physiological dead space can be calculated using the Bohr equation, which is given as a ratio of dead space to tidal volume:įor example, let’s say an adult patient has a PaCO2 of 42 mmHg and a PeCO2 of 33 mmHg. In severe cases, respiratory failure can occur, which is a life-threatening condition that requires immediate medical attention. Over time, this can lead to respiratory acidosis (i.e., a buildup of carbon dioxide in the blood) and tissue hypoxemia (i.e., a lack of oxygen in the tissues). That is because less carbon dioxide is being removed from the body and less oxygen is being delivered to the tissues. This results in a lack of gas exchange at the alveolar level, which causes the PaCO2 to increase and the PaO2 to decrease. ![]()
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