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0 Exakte Antworten 0 Text Antworten 70 Multiple Choice Antworten
Fenster schliessen

A new halogenated gas anesthetic has a blood:gas partition coefficient of 0.5 and a MAC value of 1%. Which prediction about this agent is most accurate? (Refer to Table 25–1 for comparison of agents.)

Equilibrium between arterial and venous gas tension will be achieved very slowly

It will be metabolized by the liver to release fluoride ions

It will be more soluble in the blood than isoflurane

Speed of onset will be similar to that of nitrous oxide

The new agent will be more potent than halothane

Fenster schliessen

Which statement concerning the effects of anesthetic agents is false?

Bronchiolar smooth muscle relaxation occurs during halothane anesthesia

Chest muscle rigidity often follows the administration of fentanyl

Mild, generalized muscle twitching occurs at high doses of enflurane

Severe hepatitis has been reported after the use of methoxyflurane

The use of midazolam with inhalation anesthetics may prolong postanesthesia recovery

Fenster schliessen

A 23-year-old man has a pheochromocytoma, blood pressure of 190/120 mm Hg, and hematocrit of 50%. Pulmonary function and renal function are normal. His catecholamines are elevated, and he has a well-defined abdominal tumor on MRI. He has been scheduled for surgery. Which one of the following agents should be avoided in the anesthesia protocol? 

Desflurane

Fentanyl

Isoflurane

Midazolam

Sevoflurane

Fenster schliessen

​Which statement concerning nitrous oxide is accurate?

A useful component of anesthesia protocols because it lacks cardiovascular depression

Anemia is a common adverse effect in patients exposed to nitrous oxide for periods longer than 2 h

It is the most potent of the inhaled anesthetics

There is a direct association between the use of nitrous oxide and malignant hyperthermia

Up to 50% of nitrous oxide is eliminated via hepatic metabolism

Fenster schliessen

Which statement concerning anesthetic MAC (minimum anesthetic concentration) value is accurate? 

Anesthetics with low MAC value have low potency

MAC values increase in elderly patients

MAC values give information about the slope of the dose–response curve

Methoxyflurane has an extremely low MAC value

Simultaneous use of opioid analgesics increases the MAC for inhaled anesthetics

Fenster schliessen

Total intravenous anesthesia with fentanyl has been selected for a frail elderly woman about to undergo cardiac surgery. Which statement about this anesthesia protocol is accurate? 

Fentanyl will control the hypertensive response to surgical stimulation

Marked relaxation of skeletal muscles is anticipated

Opioids such as fentanyl provide useful cardiostimulatory effects

Patient awareness may occur during surgery, with recall after recovery

The patient is likely to experience pain during surgery

Fenster schliessen

A 20-year-old male patient scheduled for hernia surgery was anesthetized with halothane and nitrous oxide; tubocurarine was provided for skeletal muscle relaxation. The patient rapidly developed tachycardia and became hypertensive. Generalized skeletal muscle rigidity was accompanied by marked hyperthermia. Laboratory values revealed hyperkalemia and acidosis. 

This unusual complication of anesthesia is most likely to be caused by

Acetylcholine release from somatic nerve endings atskeletal muscle

Activation of brain dopamine receptors by halothane

Antagonism of autonomic ganglia by tubocurarine

Calcium released within skeletal muscle

Toxic metabolites of nitrous oxide

Fenster schliessen

A 20-year-old male patient scheduled for hernia surgery was anesthetized with halothane and nitrous oxide; tubocurarine was provided for skeletal muscle relaxation. The patient rapidly developed tachycardia and became hypertensive. Generalized skeletal muscle rigidity was accompanied by marked hyperthermia. Laboratory values revealed hyperkalemia and acidosis.

The patient should be treated immediately with

Atropine

Baclofen

Dantrolene

Edrophonium

Flumazenil