Anesthesia Hub -

10 Random Questions

Following pneumonectomy, a paralyzed patient being mechanically ventilated has the following arterial blood gas values: PaO2 71 mmHg, PaCO2 55 mmHg, pH 7.29. SvO2 is 45%. The most likely explanation for this SvO2 is

(A) decreased red cell mass
(B) high cardiac output
(C) hypothermia
(D) peripheral left-to-right arteriovenous shunt
(E) ventilation / perfusion mismatch

ADVANCED Respiratory & Critical Care General

Which of the following statements concerning barbiturate protection from cerebral ischemia is true?

(A) It may be achieved with dosages low enough to avoid cardiovascular effects
(B) It is linearly dose-related
(C) It improves neurologic outcome following cardiac arrest
(D) It is most useful in patients with focal ischemia
(E) It is unrelated to EEG activity

ADVANCED Neuro

Preoperative evaluation of a patient who has marked malnutrition will demonstrate each of the following EXCEPT

(A) decreased respiratory muscle function
(B) decreased serum albumin concentration
(C) decreased metabolic rate
(D) suppressed immune function
(E) decreased extracellular fluid volume

BASIC General

Which of the following fluids will restore circulating blood volume with the smallest infused volume?

(A) Albumin 25%
(B) Dextrose 5% in saline solution 0.45%
(C) Hydroxyethyl starch 6%
(D) Lactated Ringer's solution
(E) Type-specific whole blood

Each of the following is an effect of rapid infusion of mannitol EXCEPT

(A) depletion of electrolytes
(B) impaired platelet adhesiveness
(C) increased intracranial pressure
(D) increased intravascular fluid volume
(E) increased renal blood flow

ADVANCED Pharmacology & Pharmacokinetics Neuro

A 90-kg, 59-year-old man with chronic obstructive pulmonary disease is undergoing laparotomy. Mechanical ventilation is being carried out with a fresh gas flow of 2 L/min at a rate of 16/min and tidal volume of 900 ml; I:E ratio is 1:2.5. PaCO2 remains greater than 50 mmHg. Preoperative PaCO2, was normal. Which of the following is the most appropriate next step?

(A) Adding 10 cmH20 of positive end-expiratory pressure
(B) Converting to spontaneous ventilation
(C) Decreasing inspiratory flow rate
(D) Increasing exhalation time
(E) Increasing fresh gas flow

ADVANCED Respiratory & Critical Care General

One hour after induction of anesthesia for a posterior fossa craniotomy using opioid, relaxant, and nitrous oxide, the brain begins to protrude through the dura. The most effective measure to decrease intracranial pressure is to

(A) administer additional opioid
(B) decrease PaCO2 from 25 to 15 mmHg
(C) drain cerebrospinal fluid
(D) discontinue nitrous oxide
(E) induce hypotension

ADVANCED Neuro

During attempted awake intubation, the patient gags when the laryngoscope presses on the base of the tongue. Which of the following cranial nerves is responsible for the afferent limb of this reflex?

(A) Trigeminal
(B) Facial
(C) Glossopharyngeal
(D) Vagus
(E) Hypoglossal

BASIC Regional & Pain

In a patient with surgically significant aortic insufficiency, cardiac output measured by thermodilution will

(A) be greater than right ventricular output
(B) be less than left ventricular output
(C) be less than cardiac output measured by the Fick method
(D) be inaccurate because of decreased signal-to-noise ratio
(E) underestimate net systemic arterial blood flow

ADVANCED Cardiac

Immediately after a retrobulbar block for cataract surgery, the eye grossly protrudes and the patient has the sensation of pressure in the eye. The most appropriate initial intervention is

(A) hyperventilation
(B) surgical drainage of a hematoma
(C) manual compression of the globe
(D) administration of atropine intravenously
(E) administration of mannitol intravenously

ADVANCED Regional & Pain