The physiological dead space is the anatomical dead space plus alveolar dead space. What is the difference between dead space and alveolar ventilation? ![]() The physiological dead space is the combination of anatomic and alveolar dead space. Thus, only one alveolus is receiving ventilation and perfusion (alveolus 2) alveolus 1 and 3 are being ventilated but not perfused (ie, alveolar dead space). Is alveolar dead space the same as physiological dead space? ![]() Other causes include pulmonary embolism, pulmonary hypotension, and ARDS. The commonest causes of increased alveolar deadspace are airways disease–smoking, bronchitis, emphysema, and asthma. The alveolar deadspace is caused by ventilation/perfusion inequalities at the alveolar level.
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