This results in the blood going elsewhere, as in blood vessels of the lungs. This results in increased pressure in the pulmonary circulatory system. Further, there is swelling due to fluid loss in non-alveolar capillaries. Normally, pressure drops from 150 mm Hg to 100 mm Hg. Hg normally saturates the hemoglobin.
Hyperventilation also causes alkolosis.
The kidney, over time, can adapt to this and restore the pH balance. Increasing the number of red blood cells can aid in the oxygen carrying capacity of the blood. This process takes weeks to months. When the gradient is shallow like this, it help to bring point A and Point B at the two ends of the gradient closer together. Increased ability of the cells to use the oxygen that is available to them.