Which of the following is greater in an obese patient than in a nonobese patient of equal height?
(A) Milliliters of local anesthetic required for epidural block
(B) Milligrams of succinylcholine required for intubation
(C) Clearance of diazepam
(D) Clearance of fentanyl
(E) Oxygen consumption per body surface area
B
A 55-year-old man undergoes abdominal perineal resection in the lithotomy position during combined epidural (bupivacaine 0.5%) and isoflurane anesthesia. The epidural catheter is left in place with an infusion of fentanyl 50 jug/hr. Twelve hours after surgery, the patient has left footdrop. Which of the following is the most likely explanation?
(A) Epidural hematoma
(B) Epidural opioid
(C) Inadequate padding of the knee during surgery
(D) Nerve injury from the epidural catheter
(E) Residual effects of the local anesthetic
C
Which of the following is most effective for maintaining core body temperature in an adult during general anesthesia for foot surgery?
(A) Heating inspired gas to 28°C
(B) Warming intravenous fluids to 30°C
(C) Increasing ambient temperature to 28°C
(D) Placing a warming blanket beneath the patient
(E) Placing four 200-watt warming bulbs within 76 cm of the wound
C
The flow proportioning system on an anesthesia machine
(A) is regulated primarily by changes in oxygen input pressure
(B) limits nitrous oxide flow when oxygen pressure falls below a preset value
(C) maintains a minimum ratio of oxygen to nitrous oxide in fresh gas flow
(D) precludes the use of a closed system
(E) regulates flows of oxygen and nitrous oxide to maintain a fixed FlO:
Each of the following findings is characteristic of chronic reflex sympathetic dystrophy of the extremities EXCEPT
(A) allodynia
(B) bone demineralization
(C) edema
(D) hyperpathia
(E) warm skin
E
Syringe A contains 100 ml of normal blood with a PO2 of 2 mmHg, and syringe B contains 100 ml of normal blood with a PO2 of 98 mmHg. The contents of the two syringes are mixed anaerobicaily to equilibrium. The PO2 of the resultant mixture Is
A 55-year-old woman receiving chronic dialysis for renal failure comes to the emergency department with a perforated viscus. She has chest pain. Heart rate is 124 bpm, blood pressure is 90/60 mmHg, and respiratory rate is 18/min. Surgery is to be performed within the hour. Which of the following best describes this patient's ASA physical status classification?
(A) III
(B) III E
(C) IV
(D) IV E
(E) V E
D
A patient sustains cardiac arrest while being mechanically ventilated. Which of the following is the most likely effect on PetCO2?
(A) Gradual increase with the duration of asystole
(B) Maintenance of the prearrest value
(C) Abrupt decrease below the prearrest value
(D) Decrease when thoracic compression is started
(E) Gradual decrease independent of the ventilator cycle