You see a flash of fire from the endotracheal tube of a patient undergoing carbon dioxide laser excision of laryngeal polyps. The immediate response should be to
(A) discontinue the fresh gas flow
(B) increase the nitrous oxide concentration
(C) spray water down the endoscope
(D) insert wet pads into the pharynx
(E) remove the endotracheal tube
E
Which of the following will most closely mimic the effects of stellate ganglion block?
(A) Axillary perivascular block with 25 mL of 1.5% lidocaine
(B) Cervical nerve block at C2-5 with 2 mL of 1.5% lidocaine
(C) Supraclavicular block at the level of the first rib with 25 mL of 1.5% lidocaine
(D) Block of the median, radial, ulnar, musculocutaneous, and intercostobrachial nerves
A 100-kg, 42-year-old woman received enflurane and oxygen for clipping of an intracranial aneurysm lasting eight hours. In the first two postoperative hours, urine output is 2 liters. Serum sodium concentration is 152 mEq/L. Urine osmolality and central venous pressure are low. Which of the following is best used to establish the diagnosis?
Ten minutes after induction of anesthesia with thiopental and isoflurane but before incision, a patient's nasopharyngeal temperature has decreased to 35.4°C. Which of the following contributed most to this decrease in temperature?
(A) Anesthesia-induced block of nonshivering thermogenesis