History of Anesthesia — MCQs
Ether was first used as an anesthetic by?
During cesarean section under general endotracheal anaesthesia, venous air embolism
Who is known for demonstrating the levels of ether anesthesia?
A 32-year-old male is a known hypertensive and is being planned for cholecystectomy. Which of the following anesthetic agents is contraindicated in this person?
Stages of anesthesia were established by
Which stage of surgical anesthesia is optimal for surgery?
Which of the following is contraindicated in an epileptic patient posted for general anesthesia?
Maximum Airway Irritation caused by:-
Which of the following is the most suitable anesthetic agent for use in dogs?
Which of the following drugs is used for hypotensive anesthesia:
History of Anesthesia Indian Medical PG Practice Questions and MCQs
Question 1: Ether was first used as an anesthetic by?
- A. Morton (Correct Answer)
- B. Wells
- C. Simpson
- D. Priestly
Explanation: ***Morton*** - **William T.G. Morton**, a dentist, publicly demonstrated the use of **ether as a surgical anesthetic** in 1846 during a tooth extraction at Massachusetts General Hospital. - This event marked a pivotal moment in medicine, revolutionizing surgical practices by providing effective pain relief. *Priestly* - **Joseph Priestley** was an 18th-century chemist who discovered several gases, including **oxygen**, but was not involved in the anesthetic use of ether. - His work was foundational to understanding the composition of air but did not extend to surgical applications of inhaled substances. *Wells* - **Horace Wells**, an American dentist, was an early pioneer in anesthesia who experimented with **nitrous oxide** as an anesthetic for tooth extractions. - While significant, his work predated and differed from Morton's successful public demonstration and widespread adoption of ether. *Simpson* - **James Young Simpson**, a Scottish obstetrician, is credited with pioneering the use of **chloroform** as an anesthetic, particularly in childbirth. - His contributions were later than Morton's use of ether and involved a different anesthetic agent.
Question 2: During cesarean section under general endotracheal anaesthesia, venous air embolism
- A. Induces severe hypertension
- B. Is associated with decreased end-tidal CO2 (Correct Answer)
- C. Should be treated with nitrous oxide
- D. Is associated with high end-tidal CO2
Explanation: ***Is associated with decreased end-tidal CO2*** - Venous air embolism causes **pulmonary artery obstruction**, leading to ventilation-perfusion mismatch and decreased blood flow to the lungs. - This reduced pulmonary blood flow results in a significant **decrease in expired CO2**, as less CO2 is delivered to the alveoli for exhalation. *Induces severe hypertension* - Venous air embolism typically causes **hypotension** due to reduced cardiac output and right ventricular failure, not hypertension. - Direct effects of air in the circulation include **vasodilation** and myocardial depression, contributing to a drop in blood pressure. *Should be treated with nitrous oxide* - **Nitrous oxide** should be avoided in cases of venous air embolism as it expands gas-filled spaces, potentially increasing the size of the air embolus and worsening patient outcomes. - Treatment involves 100% oxygen, Trendelenburg position, left lateral decubitus, and aspiration of air from the right atrium, not the administration of additional gas. *Is associated with high end-tidal CO2* - A high end-tidal CO2 would indicate improved ventilation or perfusion, which is contrary to the effects of a venous air embolism that **reduces pulmonary blood flow** and thus CO2 exchange. - The hallmark respiratory sign of venous air embolism is a **sudden profound decrease in end-tidal CO2** due to arterial obstruction.
Question 3: Who is known for demonstrating the levels of ether anesthesia?
- A. Morton
- B. Guedel (Correct Answer)
- C. Thompson
- D. None of the options
Explanation: ***Guedel*** - Arthur Guedel developed and refined the **stages and planes of ether anesthesia** based on clinical observations of respiratory patterns, eye signs, and muscle tone. - His classification system, known as the **Guedel stages**, provided a systematic approach to monitoring anesthetic depth, especially useful before the advent of modern anesthetic agents and monitoring equipment. *Morton* - **William T.G. Morton** is credited with the first successful public demonstration of sulfuric ether as a surgical anesthetic in 1846 during a tooth extraction. - While he pioneered the use of ether for anesthesia, he did not develop the classic stages of anesthetic depth. *Thompson* - There is no widely recognized historical figure named Thompson who is primarily known for defining the **levels or stages of ether anesthesia**. - This name is not associated with the primary discovery or classification of anesthetic depth. *None of the options* - This option is incorrect because **Guedel** is specifically known for his work in defining the stages of ether anesthesia. - Guedel's contributions were significant in standardizing anesthetic practice for many years.
Question 4: A 32-year-old male is a known hypertensive and is being planned for cholecystectomy. Which of the following anesthetic agents is contraindicated in this person?
- A. Etomidate
- B. Propofol
- C. Ketamine (Correct Answer)
- D. Midazolam
Explanation: ***Ketamine*** - **Ketamine** can cause significant increases in **heart rate** and **blood pressure**, which are undesirable in a hypertensive patient undergoing surgery. - Its **sympathomimetic effects** can exacerbate pre-existing hypertension and increase the risk of perioperative cardiovascular complications. *Etomidate* - **Etomidate** is known for its **cardiovascular stability**, making it a good choice for hypertensive patients as it has minimal effects on heart rate and blood pressure. - It can, however, suppress adrenal steroid synthesis, which is generally not a contraindication for a single dose in a healthy hypertensive patient. *Propofol* - **Propofol** often causes a **dose-dependent decrease in blood pressure** due to vasodilation and myocardial depression. - While this can be a concern, it is usually managed by careful titration and is less likely to exacerbate hypertension than ketamine. *Midazolam* - **Midazolam** is a benzodiazepine that provides **sedation and anxiolysis**; it has minimal effects on hemodynamics at typical anesthetic induction doses. - It is often used as a co-induction agent, not as a primary induction agent, and generally does not worsen hypertension.
Question 5: Stages of anesthesia were established by
- A. Diethyl ether (Correct Answer)
- B. Nitrous oxide
- C. Halothane
- D. Chloroform
Explanation: ***Diethyl ether** - The classic stages of anesthesia (analgesia, excitement, surgical anesthesia, medullary depression) were originally described in relation to the administration of **diethyl ether**. - Its slow onset and prolonged half-life allowed for the clear observation and definition of these distinct stages. *Nitrous oxide* - This gaseous anesthetic has a rapid onset and offset, making it difficult to clearly delineate all four classical stages with its use. - It is often used as an adjunct to other anesthetics rather than as a sole agent for prolonged surgical anesthesia. *Halothane* - Halothane is a potent volatile anesthetic that became popular after ether, but its use also does not typically involve the clear, step-wise progression through all four anesthetic stages as seen with ether. - It was one of the first widely used inhaled anesthetics that largely replaced ether due to better patient control and fewer side effects. *Chloroform* - Chloroform was another early anesthetic but was associated with significant cardiac and hepatic toxicity, leading to its limited use and eventual discontinuation. - While it induced anesthesia, the clear staging of anesthetic depth was primarily established and standardized using diethyl ether.
Question 6: Which stage of surgical anesthesia is optimal for surgery?
- A. Stage I
- B. Stage II
- C. Stage III (Correct Answer)
- D. Stage IV
Explanation: ***Stage III*** - This stage, also known as **surgical anesthesia**, is characterized by stable vital signs, loss of consciousness, and adequate muscle relaxation, making it ideal for performing surgical procedures. - During this stage, the patient's reflexes are suppressed, and pain perception is abolished, ensuring a smooth and pain-free surgical experience. *Stage I* - This is the **analgesia stage**, where the patient is conscious but drowsy and may experience some pain relief. Incisions are typically not made during this stage. - Reflexes are still present, and the patient may be able to communicate, meaning surgical pain would still be experienced. *Stage II* - Often referred to as the **delirium stage** or **excitement stage**, this phase is characterized by involuntary movements, struggling, and potentially vomiting. - It is an undesirable stage for surgery due to the risk of injury to the patient and staff, and the instability of vital signs. *Stage IV* - This stage, known as **medullary depression**, represents an overdose of anesthetic agents, leading to severe depression of respiratory and cardiovascular centers. - It is a life-threatening stage characterized by complete respiratory arrest, cardiovascular collapse, and potential death, requiring immediate intervention.
Question 7: Which of the following is contraindicated in an epileptic patient posted for general anesthesia?
- A. Propofol
- B. Midazolam
- C. Thiopentone
- D. Ketamine (Correct Answer)
Explanation: ***Ketamine*** - **Ketamine** is known to increase **intracranial pressure (ICP)** and can be associated with **psychotomimetic effects** and **seizure-like activity** in some patients. - While not an absolute contraindication for all epileptic patients, its use requires careful consideration due to the potential for **central nervous system stimulation** and **exacerbation of seizure disorders**. *Propofol* - **Propofol** generally has **antiepileptic properties** and can suppress seizure activity, making it a relatively safe choice for induction and maintenance of anesthesia in epileptic patients. - It reduces cerebral metabolic rate and **intracranial pressure**, which is beneficial in neurological contexts. *Midazolam* - **Midazolam** is a **benzodiazepine** with significant **antiepileptic activity**, commonly used to treat status epilepticus and as a premedication for surgery in epileptic patients. - It enhances **GABAergic inhibition**, thereby reducing neuronal excitability and seizure risk. *Thiopentone* - **Thiopentone**, a **barbiturate**, is a potent **antiepileptic agent** that effectively suppresses seizure activity by enhancing GABAergic transmission. - It is often used to induce anesthesia in patients with epilepsy due to its **cerebroprotective effects** and ability to decrease cerebral metabolic rate.
Question 8: Maximum Airway Irritation caused by:-
- A. Halothane
- B. Enflurane
- C. Desflurane (Correct Answer)
- D. Sevoflurane
- E. Isoflurane
Explanation: ***Desflurane*** - **Desflurane** has a pungent odor and is known to cause significant **airway irritation**, leading to coughing, breath-holding, laryngospasm, and secretions, especially during induction. - Its high volatility and low blood-gas solubility contribute to its rapid onset and offset, but also increase its propensity for airway irritation. *Halothane* - **Halothane** has a sweet, non-pungent odor and is generally well-tolerated during induction, causing minimal airway irritation. - Although it causes myocardial depression and is associated with hepatotoxicity, airway irritation is not a primary concern. *Enflurane* - **Enflurane** has a mild, sweet odor and causes less airway irritation than **desflurane**, but more than halothane or sevoflurane. - It can cause central nervous system excitation at high concentrations, but airway irritation is not its most prominent side effect. *Sevoflurane* - **Sevoflurane** has a pleasant, non-pungent odor and is known for its minimal airway irritation, making it an excellent choice for inhalational inductions, particularly in pediatric patients. - It is often preferred over other volatile anesthetics when airway reactivity is a concern. *Isoflurane* - **Isoflurane** has a pungent odor and can cause moderate airway irritation, but generally less than desflurane. - It is associated with a higher incidence of coughing and breath-holding during induction compared to sevoflurane.
Question 9: Which of the following is the most suitable anesthetic agent for use in dogs?
- A. Propofol (Correct Answer)
- B. Medetomidine hydrochloride
- C. Ketamine
- D. Midazolam
Explanation: ***Propofol*** - **Propofol** is a widely used and highly effective intravenous anesthetic in dogs due to its **rapid induction** and **rapid recovery**. - It produces minimal cumulative effects when administered as a constant rate infusion, making it suitable for both short procedures and maintenance of anesthesia. *Medetomidine hydrochloride* - **Medetomidine** is an **alpha-2 agonist** primarily used as a sedative and analgesic in dogs, not typically as the sole anesthetic agent for general anesthesia. - While it provides profound sedation, it is usually combined with other drugs (e.g., ketamine) to achieve surgical planes of anesthesia, and its effects on reducing heart rate and blood pressure can be significant. *Ketamine* - **Ketamine** is a **dissociative anesthetic** that provides good analgesia and somatic anesthesia but often causes muscle rigidity and can increase sympathetic tone. - It is typically used in combination with other sedatives or tranquilizers (e.g., diazepam, midazolam) to ensure smooth induction and recovery and prevent adverse effects like seizures. *Midazolam* - **Midazolam** is a **benzodiazepine** primarily used as a sedative, anxiolytic, and muscle relaxant, often as a premedicant or co-induction agent, not as a primary anesthetic for general anesthesia in dogs. - It offers minimal cardiovascular and respiratory depression when used alone, but it does not produce sufficient anesthetic depth for surgical procedures.
Question 10: Which of the following drugs is used for hypotensive anesthesia:
- A. Both Isoflurane and Nitroglycerin (Correct Answer)
- B. Isoflurane
- C. Nitroglycerin
- D. Dantrolene
Explanation: ***Both Isoflurane and Nitroglycerin*** - **Isoflurane** is a volatile anesthetic that can induce **hypotension** by decreasing systemic vascular resistance and myocardial contractility. - **Nitroglycerin** is a potent vasodilator that primarily acts on veins, but also on arteries, to reduce preload and afterload, thereby lowering blood pressure. *Isoflurane* - While **Isoflurane** can be used as part of a hypotensive anesthesia strategy, it is not the sole drug capable of achieving this effect. - Its hypotensive action is dose-dependent and results from **vasodilation** and direct **myocardial depression**. *Nitroglycerin* - **Nitroglycerin** is effective in inducing controlled **hypotension** due to its rapid onset and short duration of action as a vasodilator. - It is frequently used in anesthesia for its ability to reduce blood pressure, particularly in situations requiring a **dry surgical field**. *Dantrolene* - **Dantrolene** is a skeletal muscle relaxant primarily used to treat and prevent **malignant hyperthermia**. - It does not directly induce **hypotension** and is not indicated for hypotensive anesthesia.
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