Therefore, PaCO2 Increase As From Reduction VA, And

Therefore, PaCO2 increase as from reduction VA, and at all kinds hypoventilation of lungs. As space And a surface of alveoluses and also can work not effectively ( The age, etc.) increase PaCO2 conducts illnesses of bronchial tubes to reduction Percentage of oxygen with the subsequent . Alveolar ventilation can decrease, when The physiological dead space of lungs increases (that is, VD/VT A parity). The physiological dead space increases, When ventilation of lungs increases and it leads to infringement Parities blood and volumes of a stream of alveolar air. Increase in physiological dead space at hyperventilation Does not correspond in classical representation about mechanisms of infringements Functions of breath at patients with an emphysema and COPD. Effect of occurrence of the physiological dead Spaces at alveolar hypoventilation can be expressed in Following equation: PaCO2 = (k) (VCO2)/VE (1 - VD/VT). In which VE There is an exhalation volume, and (1 - VD/VT) a ventilation part, directly Involved in a gas exchange.