Patients with increased intracranial pressure should be observed for changes in pupil size, reflex to light, state of consciousness, and vital signs, including respiration, blood pressure, oxygen saturation, and heart rate. The presence of increased intracranial pressure may cause brainstem compression and may result in unstable vital signs, including increased heart rate, increased respiration, and increased or decreased blood pressure. Patients may also have dilated and fixed pupils and a weakened or absent light reflex. Patients may also experience impaired consciousness, which may include drowsiness, lethargy, coma, decortical state, and vegetative state, so they may experience blurred consciousness, delirium, etc. Increased intraocular pressure may also occur.