Anesthesia Hub -

10 Random Questions

Which of the following statements concerning the pharmacokinetics of local anesthetics is true?

(A) Decreased molecular weight is associated with decreased incidence of allergic reactions
(B) Decreased protein binding is associated with decreased systemic toxicity
(C) Increased ionization is associated with increased placental transfer
(D) Increased lipid solubility is associated with faster onset
(E) Presence of an ester linkage is associated with increased duration of action

Which of the following nerves should be blocked for an operation at the medial aspect of the lower leg?

(A) Femoral
(B) Sciatic
(C) Obturator
(D) Common peroneal
(E) Tibial

With respect to mechanical ventilation, which of the following statements concerning the portion of tidal volume known as compression volume is true?

(A) It is calculated by dividing the volume of gas delivered to the patient by the peak pressure
(B) It does not contribute to the volume of gas entering the patient
(C) It is not included in the volume measured by a spirometer on the inspiratory limb
(D) It decreases with the addition of a humidifier to the breathing circuit
(E) It decreases with the addition of one-way valves at the Y connector of the breathing circuit

BASIC Equipment & Physics

Which of the following is more likely to occur with use of trimethaphan to induce hypotension than with use of nitroprusside?

(A) A predictable decrease in mean arterial pressure
(B) Increased mixed venous P02
(C) Increased serum lactate concentration
(D) Mydriasis
(E) Reflex tachycardia

In a patient with a history of grand mal seizures, which of the following is most useful in distinguishing a seizure from normal anesthetic emergence?

(A) Mydriasis
(B) Myoclonic activity
(C) Nystagmus
(D) Positive Babinski sign
(E) None of the above

In a patient with adult respiratory distress syndrome who is being mechanically ventilated, which of the following findings indicates the most severe disease?

(A) Decreased functional residual capacity
(B) Decreased lung compliance
(C) Hypercarbia
(D) Hypoxemia
(E) Increased dead space

ADVANCED Respiratory & Critical Care

A 10-week-old infant born at 28 weeks gestation is scheduled for elective repair of bilateral inguinal hernias. It is most appropriate to

(A) delay the operation until the infant is 6 months old
(B) transfuse blood preoperatively if hemoglobin concentration is 9 g/dl
(C) avoid tracheal intubation
(D) limit inspired oxygen concentration to less than 50%
(E) monitor for apnea for 24 hours postoperatively

ADVANCED Pediatric

With an interscalene brachial plexus block

(A) more local anesthetic drug is required than for axillary block
(B) the biceps and brachialis muscles are blocked last
(C) the intercostobrachial nerve is usually blocked
(D) the lateral antebrachial cutaneous nerve is usually spared
(E) the ulnar nerve is most likely to be spared

ADVANCED Regional & Pain

A 60-year-old woman who is taking propranolol for hypertension and is allergic to penicillin is anesthetized with thiopental and halothane for resection of an abdominal aortic aneurysm. Shortly after intubation she is given vancomycin 500 mg intravenously, after which her blood pressure decreases from 140/80 to 70/50 mmHg while her heart rate remains steady at 64 bpm. The most likely explanation for the decrease in blood pressure is

(A) cross-sensitivity of penicillin and vancomycin
(B) interaction of vancomycin and propranolol
(C) vancomycin-induced anaphylactoid reaction
(D) interaction of halothane and propranolol
(E) interaction of halothane and vancomycin

A 60-year-old man undergoing resection of an abdominal aortic aneurysm has an increase in measured mixed venous oxygen saturation from 70% to 90%. Which of the following is the most likely cause?

(A) Decreased cardiac output
(B) Decreased hematocrit
(C) Intrapulmonary shunting
(D) Right to left shunting at the atrial level
(E) Wedging of the pulmonary artery catheter