Anatomic vs physiologic dead space10/7/2023 ![]() ![]() The ratio of physiologic dead space to tidal volume is usually about 1/3. ![]() Alveolar dead space is the volume of gas within unperfused alveoli (and thus not participating in gas exchange either) it is usually negligible in the healthy, awake patient. Anatomical dead space This includes any breathing system or airway plus mouth, trachea and the airways up until the start of the respiratory zone. Dead space can be classified into 3 types :- 1. Anatomic dead space is the volume of gas within the conducting zone (as opposed to the transitional and respiratory zones) and includes the trachea, bronchus, bronchioles, and terminal bronchioles it is approximately 2 mL/kg in the upright position. DEAD SPACE-1 Dead space can be defined as a volume of gas which does not take part in gas exchange. Because of the relatively large head size of infants and children, we hypothesized that extrathoracic and. Therefore, physiological VD anatomic VD + alveolar VD. Physiologic or total dead space is the sum of anatomic dead space and alveolar dead space. In adults, anatomic dead space is 2.2 ml/kg. The sum of the two types of dead space is physiological dead space volume. Dead space is the volume of a breath that does not participate in gas exchange. ![]()
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