NCLEX Style Study Question
Which of the following reduces cerebral edema by constricting cerebral veins?
- Dexamethasone (Decadron)
- Mechanical hyperventilation
- Mannitol (Osmitrol)
- Ventriculostomy
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July 14th, 2005 at 10:03 am
1
July 14th, 2005 at 5:35 pm
Answer: 2
Hyperventilation with oxygen from a handheld resuscitation
bag or respirator helps rid the patient of excess carbon
dioxide, thereby constricting cerebral vessels and reducing
cerebral blood volume and ICP.
July 15th, 2005 at 1:49 am
# 1
July 16th, 2005 at 2:27 pm
1
July 18th, 2005 at 3:03 am
Answer 2. Hyprventilate the patient.
July 22nd, 2005 at 8:00 am
2
July 24th, 2005 at 3:38 pm
Correct answer: 2
Mechanical hyperventilation to reduce CO2 levels to 25 mmHg produces cerebral vasoconstriction and thereby decreases ICP. Dexamethasone is an anti-infllammatory agent. Mannitol is an osmotic diuretic. While the actions of both drugs will reduce cerebral edema, neither constricts cerebral veins. Ventriculostomy is a surgical procedure where a catheter is placed into a cerebral ventricle to drain excess cerebrospinal fluid.