Abstract
We studied anesthetized dogs subjected to graded increases in intracranial pressure (ICP) to assess the role of the systemic vasopressor (Cushing) response in the arterial hypoxemia associated with increased ICP. The arterial PO 2 decrement was significantly greater with rapidly increased ICP compared to slowly increased ICP (P<0.01). Systemic vasopressor responses generated in cats by direct electrical stimulation of the vasomotor center resulted in arterial hypoxemia during controlled ventilation. Therefore, arterial hypoxemia was coincident with increased systemic blood pressure produced by either elevation of ICP or electrical stimulation of the vasomotor center.
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