<unk>  is a condition in which the tissues of the body are deprived of the necessary levels of oxygen. This is not to be confused with hypoxemia, which refers to low levels of oxygen in the blood, although the two conditions often occur simultaneously, since a decrease in blood oxygen typically corresponds to a decrease in oxygen in the surrounding tissue. However,<unk>  may be present without hypoxemia, and vice versa, as in the case of infarction.
Generalized hypoxia
Cardiovascular drift
Cyclospasm
Bradypnea
Exercise intolerance
Apnea
Respiratory arrest
Orthostatic hypotension