The lungs of a 7-kg infant are being ventilated with a volume-cycled ventilator at a rate of 20/min. The anesthetic circuit has a compressible volume of 5 ml/cm H2O, and the peak inspiratory pressure is 20 cmH2O. To achieve adequate ventilation, the ventilator tidal volume should be set at
Each of the following contributes to hypotension following induction of anesthesia with propofol EXCEPT
(A) central vagal stimulation
(B) decreased central sympathetic tone
(C) direct myocardial depression
(D) resetting of arterial baroreceptors
(E) systemic vasodilation
A
A 29-year-old man who has been nasotracheally intubated for two weeks following a motor vehicle accident has a fever (39C) and a constant headache. Leukocyte count is 18,000/mm3. The most likely cause is
A 70-kg patient is anesthetized for a craniotomy in the sitting position. Minute ventilation through a circle system is 15 L/min; PetC02 is 65 mmHg. Which of the following is the most likely cause of the increased PetC02?
(A) Inadequate flow of fresh gas
(B) Incompetent expiratory valve
(C) Intubation of the right mainstem bronchus
(D) Light anesthesia
(E) Venous air embolism
B
Which the following findings is most hazardous in premature infants?
(A) Hematocrit of 55%
(B) Rectal temperature of 35 degrees C
(C) Umbilical arterial blood PO2 of 50 mmHg
(D) Umbilical arterial blood PCO2 of 45 mmHg
(E) Umbilical arterial systolic pressure of 60 mmHg
A 70-kg, 50-year-old man is scheduled for muscle flap closure of a decubitus ulcer over the sacrum. He has been quadriplegic at the level of C6-7 for six years. Which of the following is most likely to result from subarachnoid anesthesia with tetracaine 10 mg for this procedure?