A previously healthy 28-year-old woman scheduled for laparoscopic tubal ligation becomes, agitated and refuses to undergo the procedure after being brought to the operating room. This behavior most likely resulted from preoperative administration of
Postoperatively a 70-kg patient has a serum sodium value of 130 mEq/L. To increase this value to 140 mEq/L would require the administration of how much sodium in mEq?
Volume-cycled flow generators are preferred over pressure-cycled ventilators in critical care units because they
(A) have a lower compression volume
(B) limit peak airway pressure
(C) maintain constant ventilatory volume with changes in lung compliance
(D) more readily compensate for gas leaks
(E) permit more accurate measurement of the patient's minute volume
C
A 24-year-old man who sustained multiple rib fractures in a motor vehicle accident has air leaks through bilateral chest tubes. Which of the following is most likely following initiation of high-frequency jet ventilation?
(A) Airway pressure will be measured most reliably at the proximal (external) end of the endotracheal tube
(B) Atelectatic areas of the lungs will re-expand
(C) Changes in end-tidal carbon dioxide tension measured at the tip of the endotracheal tube will match changes in PaCOz
(D) Hypercarbia will develop
(E) The air leaks will be proportional to peak airway pressure
E
When performed with identical doses, which of the following types of regional block is associated with the highest plasma concentration of the drug?