Which of the following is the most likely effect of long-term exposure to nitrous oxide at a concentration of 50 ppm?
(A) Impaired cognitive function
(B) Inhibition of vitamin B-12 absorption
(C) Megaloblastic changes in bone marrow
(D) Teratogenesis
(E) Thrombocytopenia
C
One hour after induction of anesthesia for a posterior fossa craniotomy using opioid, relaxant, and nitrous oxide, the brain begins to protrude through the dura. The most effective measure to decrease intracranial pressure is to
A 28-year-old woman undergoes total thyroidectomy. The left recurrent laryngeal nerve is transected during the procedure. Which of the following findings is most likely postoperatively?
Nine months after sustaining an injury to the left forearm, a 30-year-old woman has diffuse, burning pain on the anterior aspect of the forearm and posterior aspect of the hand and discoloration of the skin in the affected areas. The patient should be informed that
(A) if left untreated, muscle atrophy may develop in the involved limb
(B) if left untreated, the pain will remain well localized
(C) physical therapy is not indicated
(D) the symptoms are directly related to the severity of the initial injury
(E) the symptoms are most likely secondary to underlying peripheral vascular disease