General Anesthesia Practice Questions

Q: What is a potential consequence of repeated exposure to halothane?

Halothane hepatitis. ***Halothane hepatitis*** - Repeated exposure to halothane, especially within a short period (e.g., 28 days), significantly increases the risk of **halothane hepatitis**, a severe and potentially fatal liver injury. - This idiosyncratic reaction is due to the formation of **halothane metabolites** that bind to hepatocyte proteins, triggering an immune response. *Pancreatitis due to gallstones* - **Pancreatitis** is inflammation of the pancreas and is commonly caused by gallstones obstructing the common bile duct or by alcohol abuse. - There is no direct association between **halothane exposure** and the formation of gallstones or the development of pancreatitis. *Bacterial meningitis* - **Bacterial meningitis** is an infection of the meninges, typically caused by bacteria such as *Streptococcus pneumoniae* or *Neisseria meningitidis*. - It is an infectious disease of the central nervous system and is not a known complication of **halothane exposure**. *Viral encephalitis* - **Viral encephalitis** is an inflammation of the brain tissue caused by a viral infection (e.g., herpes simplex virus, arboviruses). - Like bacterial meningitis, it is an infectious condition of the central nervous system and has no known link to **halothane exposure**.

Q: Which of the following inhalational anesthetic agents is contraindicated in liver disease?

Halothane. ***Halothane*** - **Halothane** is metabolized in the liver, and approximately 20% undergoes **oxidative metabolism**, sometimes leading to the formation of reactive intermediates. - In susceptible individuals, these metabolites can cause **immune-mediated hepatotoxicity**, known as **halothane hepatitis**, making it contraindicated in pre-existing liver disease. *Methoxyflurane* - While **methoxyflurane** is extensively metabolized by the liver, its primary concern is **nephrotoxicity** due to the release of fluoride ions, not direct hepatotoxicity that would contraindicate it in liver disease. - It is rarely used clinically today because of its significant renal side effects. *Ether* - **Ether** is minimally metabolized by the liver; most of it is eliminated unchanged via the lungs. - It is not associated with significant hepatotoxicity and is therefore not contraindicated in liver disease. *Isoflurane* - **Isoflurane** undergoes very little metabolism (less than 1%) in the liver, making it one of the safest inhalational agents for patients with liver disease. - Its low metabolic conversion means a negligible risk of producing toxic metabolites that could harm the liver.

Q: What are the advantages associated with the use of ketamine?

All of the above. ***All of the above*** - Ketamine provides a unique combination of **rapid onset of anesthesia**, potent **analgesia**, and desirable physiological effects, making it versatile for various clinical scenarios. - Its ability to induce **dissociative anesthesia** while maintaining spontaneous respiration and cardiovascular stability distinguishes it from many other anesthetic agents. *Rapid onset of anesthesia and analgesia* - This is a key advantage, as ketamine quickly achieves an anesthetic state and provides robust pain relief. - Its rapid action allows for efficient induction and management in emergency settings or procedures requiring prompt intervention. *Bronchodilation and preserved airway reflexes* - Ketamine's **bronchodilatory effect** makes it a favorable choice in patients with reactive airway diseases like asthma. - The **preservation of airway reflexes** helps protect against aspiration, which is a significant benefit compared to other anesthetics that depress these reflexes. *Cardiovascular stability with minimal respiratory depression* - Ketamine typically causes an increase in **heart rate and blood pressure**, contributing to cardiovascular stability, especially in patients with compromised hemodynamics. - Compared to many other anesthetics, ketamine causes **minimal respiratory depression**, maintaining spontaneous breathing and reducing the need for mechanical ventilation.

Q: Which of the following drugs is most effective in preventing emergence delirium with ketamine?

Midazolam. ***Midazolam*** - **Midazolam**, a short-acting **benzodiazepine**, is highly effective in preventing and treating **emergence delirium** associated with ketamine. - Benzodiazepines like midazolam work by enhancing the effect of **GABA**, leading to anxiolytic, sedative, and amnesic effects that counteract the psychomimetic side effects of ketamine. *Atropine* - **Atropine** is an **anticholinergic drug** primarily used to prevent bradycardia and reduce secretions; it has no direct role in preventing or treating ketamine-induced emergence delirium. - Its mechanism of action involves blocking **muscarinic acetylcholine receptors**, which is unrelated to the psychomimetic effects of ketamine. *Droperidol* - **Droperidol** is a **butyrophenone** (dopamine antagonist) that can cause sedation and reduce the incidence of postoperative nausea and vomiting, but it is not the primary choice for ketamine-induced emergence delirium. - While it can provide sedation, its effectiveness in specifically targeting the psychomimetic effects of ketamine is less pronounced compared to benzodiazepines. *Thiopentone* - **Thiopentone** is a **barbiturate** commonly used for induction of anesthesia due to its rapid onset and short duration of action. - Although it provides sedation and hypnosis, it is not specifically indicated or highly effective in managing or preventing the **emergence delirium** associated with ketamine.

Question 1

What is a potential consequence of repeated exposure to halothane?

Accepted Answer

Halothane hepatitis

Answer

Pancreatitis due to gallstones

Answer

Bacterial meningitis

Answer

Viral encephalitis

Question 2

Which of the following inhalational anesthetic agents is contraindicated in liver disease?

Accepted Answer

Halothane

Answer

Methoxyflurane

Answer

Isoflurane

Answer

Ether

Question 3

What are the advantages associated with the use of ketamine?

Accepted Answer

All of the above

Answer

Rapid onset of anesthesia and analgesia

Answer

Bronchodilation and preserved airway reflexes

Answer

Cardiovascular stability with minimal respiratory depression

Question 4

Which of the following drugs is most effective in preventing emergence delirium with ketamine?

Accepted Answer

Midazolam

Answer

Atropine

Answer

Droperidol

Answer

Thiopentone

General Anesthesia — MCQs

General Anesthesia — MCQs

On this page

Practice by Chapter

Want unlimited practice?