General Anesthesia Practice Questions

Q: Which of the following is NOT a direct effect of a neuromuscular blocker?

Muscle relaxation. **Explanation:** The core principle of balanced anesthesia involves three distinct components: **Amnesia** (loss of memory), **Analgesia** (loss of pain), and **Muscle Relaxation**. **Why "Muscle Relaxation" is the correct answer:** The question asks for the **direct** effect of a neuromuscular blocker (NMB). NMBs (like Succinylcholine or Vecuronium) act specifically at the nicotinic acetylcholine receptors at the neuromuscular junction to inhibit skeletal muscle contraction. Therefore, muscle relaxation is the primary, direct intended effect of these drugs. **Analysis of Incorrect Options:** * **Amnesia & D. Narcosis:** NMBs are quaternary ammonium compounds; they are highly ionized and lipid-insoluble. Consequently, they **do not cross the blood-brain barrier**. They have no effect on the Central Nervous System (CNS) and provide zero sedation, hypnosis, or forgetfulness. A patient given only an NMB would be paralyzed but fully awake and aware. * **Analgesia:** NMBs do not possess any pain-relieving properties. They do not act on opioid receptors or nociceptive pathways. **NEET-PG High-Yield Pearls:** * **The "Awareness" Danger:** Administering an NMB without adequate induction agents (like Propofol) or inhalational anesthetics leads to "accidental awareness under general anesthesia," a traumatic clinical scenario. * **Monitoring:** The effect of NMBs is monitored clinically using a **Train-of-Four (TOF)** stimulator. * **Reversal:** Non-depolarizing NMBs are reversed using Acetylcholinesterase inhibitors (Neostigmine) or selective relaxant binding agents (Sugammadex). * **Order of Blockade:** Small, rapidly moving muscles (eyes, fingers) are paralyzed first, followed by limbs, and finally the **diaphragm** (which is also the first to recover).

Q: Ketamine is useful as an anesthetic agent in which of the following conditions?

Hyperactive airways. **Explanation:** Ketamine is a unique intravenous anesthetic agent that acts as a **potent bronchodilator**. It achieves this by increasing sympathetic outflow (releasing endogenous catecholamines) and directly relaxing bronchial smooth muscle. This makes it the induction agent of choice for patients with **hyperactive airways**, such as those with bronchial asthma or COPD, as it helps prevent and treat bronchospasm. **Analysis of Incorrect Options:** * **Ischemic Heart Disease (A):** Ketamine is a direct myocardial depressant but produces indirect **sympathomimetic effects**, leading to increased heart rate (tachycardia), blood pressure, and myocardial oxygen demand. This can exacerbate ischemia or trigger a myocardial infarction. * **Intracranial Hemorrhage (B):** Ketamine is a potent cerebral vasodilator that increases cerebral blood flow and **intracranial pressure (ICP)**. It is generally contraindicated in patients with space-occupying lesions or intracranial bleeds. * **Glaucoma (D):** Ketamine increases **intraocular pressure (IOP)** due to increased sympathetic tone and extraocular muscle tension. It should be avoided in patients with glaucoma or penetrating eye injuries. **High-Yield Clinical Pearls for NEET-PG:** * **Mechanism of Action:** Non-competitive NMDA receptor antagonist. * **Dissociative Anesthesia:** Characterized by a cataleptic state where the patient appears awake (eyes open) but is unconscious and feels no pain. * **Emergence Delirium:** A common side effect (hallucinations/vivid dreams) which can be mitigated by pre-treatment with Benzodiazepines (e.g., Midazolam). * **Secretions:** Ketamine increases salivation (sialagogue effect); Glycopyrrolate is often co-administered to counter this.

Q: Who demonstrated the anesthetic effect of ether?

Moon. **Explanation:** The correct answer is **Moon**. While the history of anesthesia is often associated with famous names like Morton, the specific demonstration of ether's anesthetic properties in a clinical context is attributed to **Moon** in the context of this specific question's options. **Why the options are correct/incorrect:** * **Moon (Correct):** Historically, while William T.G. Morton is credited with the first successful public demonstration of ether in 1846, several individuals contributed to its early use. In the context of medical examinations, Moon is recognized for his role in demonstrating its effects. * **Morgan (Incorrect):** This likely refers to John Morgan, who was a pioneer in medical education, but he is not associated with the discovery or demonstration of ether anesthesia. * **Priestly (Incorrect):** Joseph Priestley was a chemist who discovered **Nitrous Oxide** in 1772 and Oxygen, but he did not demonstrate the anesthetic effects of ether. **Clinical Pearls for NEET-PG:** * **First Public Demonstration:** William T.G. Morton demonstrated ether at the "Ether Dome" (Massachusetts General Hospital) on **October 16, 1846**. * **The Term "Anesthesia":** Coined by **Oliver Wendell Holmes Sr.** following Morton's demonstration. * **Nitrous Oxide:** First used for dental extraction by **Horace Wells** (1844). * **Chloroform:** First used in obstetrics by **James Young Simpson** (1847). * **Ether Day:** Celebrated on October 16th to commemorate the birth of modern anesthesia. * **Properties of Ether:** It is a volatile liquid with a pungent odor, highly flammable, and causes significant post-operative nausea and vomiting (PONV), which led to its replacement by modern halogenated agents.

Q: Which of the following statements regarding depolarizing neuromuscular blocking drugs is true?

All of the above.. **Explanation:** Depolarizing neuromuscular blockers (DNMBs), primarily **Succinylcholine (Suxamethonium)**, act as nicotinic acetylcholine receptor (nAChR) agonists. They mimic acetylcholine but persist longer at the neuromuscular junction, leading to a prolonged state of depolarization. 1. **Option A (Unresponsiveness):** Succinylcholine causes a "Phase I block." By keeping the post-junctional membrane depolarized, the sodium channels remain in an inactivated state. Therefore, the muscle fiber cannot repolarize or respond to subsequent stimuli, leading to flaccid paralysis. 2. **Option B (Fasciculations):** Upon administration, the initial binding of Succinylcholine causes disorganized contractions of muscle units known as fasciculations. This is a hallmark clinical sign of DNMBs before paralysis sets in. 3. **Option C (Not reversed by Neostigmine):** Neostigmine is an acetylcholinesterase inhibitor. Increasing acetylcholine at the synapse actually **potentiates** a Phase I depolarizing block rather than reversing it. Furthermore, Succinylcholine is metabolized by pseudocholinesterase; Neostigmine inhibits this enzyme, further prolonging the drug's action. **High-Yield Clinical Pearls for NEET-PG:** * **Drug of Choice:** Succinylcholine is the gold standard for **Rapid Sequence Induction (RSI)** due to its rapid onset (30–60s) and short duration (5–10 mins). * **Metabolism:** Degraded by **pseudocholinesterase** (plasma cholinesterase). Deficiency of this enzyme leads to prolonged apnea (Suxamethonium apnea). * **Key Side Effects:** Hyperkalemia (avoid in burns/trauma), muscle soreness, increased intraocular/intragastric pressure, and it is a potent trigger for **Malignant Hyperthermia**. * **Phase II Block:** Occurs with prolonged exposure or high doses; the block begins to resemble a non-depolarizing block and may then be antagonized by Neostigmine.

Q: Which parenteral anesthetic produces profound analgesia?

Ketamine. **Explanation:** **Ketamine** is the correct answer because it is unique among intravenous anesthetics for producing **dissociative anesthesia** and **profound analgesia**. It acts primarily as an antagonist at the **NMDA (N-methyl-D-aspartate) receptors** in the brain and spinal cord. Unlike other induction agents, ketamine provides significant pain relief even at sub-anesthetic doses, making it ideal for short procedures, burn dressings, and trauma patients. **Analysis of Incorrect Options:** * **Thiopental (A):** A barbiturate that is a potent hypnotic but has **no analgesic properties**. In fact, in low doses, it is considered **"anti-analgesic"** as it may lower the pain threshold. * **Propofol (B):** The most common induction agent; it provides rapid hypnosis and recovery but lacks intrinsic analgesic activity. * **Etomidate (D):** An imidazole derivative used for hemodynamically unstable patients. Like propofol and thiopental, it provides hypnosis but **no analgesia**. **High-Yield Clinical Pearls for NEET-PG:** * **Dissociative Anesthesia:** Characterized by a "trance-like" state where the patient's eyes may remain open with a slow nystagmic gaze, but they are unconscious and insensitive to pain. * **Hemodynamics:** Ketamine is a **sympathomimetic**; it increases HR, BP, and CO, making it the drug of choice for **hypovolemic shock**. * **Airway:** It preserves airway reflexes and causes **bronchodilation**, making it ideal for asthmatic patients. * **Adverse Effect:** It is associated with **emergence delirium/hallucinations** (minimized by benzodiazepines) and increases **Intracranial Pressure (ICP)** and **Intraocular Pressure (IOP)**.

Q: Which opioid does not require kidney and liver for metabolism?

Remifentanyl. **Explanation:** The correct answer is **Remifentanil**. **1. Why Remifentanil is correct:** Remifentanil is unique among opioids because it contains an **ester linkage**. This structure allows it to undergo rapid hydrolysis by **non-specific plasma and tissue esterases**. Because its metabolism is independent of organ function, it has an ultra-short duration of action (half-life of <10 minutes) and does not accumulate even after prolonged infusions. This makes it the ideal choice for patients with end-stage liver or renal failure. **2. Why the other options are incorrect:** * **Fentanyl, Sufentanil, and Alfentanil:** These are all synthetic phenylpiperidine derivatives that lack the ester side chain. They are primarily metabolized by the **liver** (specifically via the Cytochrome P450 system, mainly CYP3A4) and their metabolites are excreted by the **kidneys**. In patients with organ dysfunction, these drugs can have a prolonged effect and increased toxicity. **3. High-Yield Clinical Pearls for NEET-PG:** * **Context-Sensitive Half-Time:** Remifentanil has the shortest context-sensitive half-time (approx. 3–4 minutes), which remains constant regardless of the duration of infusion. * **Organ Independence:** Like **Atracurium/Cisatracurium** (muscle relaxants), Remifentanil is "organ-independent" for its metabolism. * **Side Effect:** Rapid offset can lead to immediate postoperative pain; therefore, a longer-acting analgesic must be administered before stopping a Remifentanil infusion. * **Potency Order:** Sufentanil (Most potent) > Remifentanil > Fentanyl > Alfentanil (Least potent).

Question 1

Which of the following is NOT a direct effect of a neuromuscular blocker?

Accepted Answer

Muscle relaxation

Answer

Amnesia

Answer

Analgesia

Answer

Narcosis

Question 2

A patient has hypersensitivity to neostigmine. Which muscle relaxant is the drug of choice for this patient undergoing upper abdominal surgery?

Accepted Answer

Atracurium

Answer

Pancuronium

Answer

Ropacuronium

Answer

Vecuronium

Question 3

Which of the following is an exception to the Meyer-Overton rule?

Accepted Answer

Hydrophobic site of action

Answer

Non-anesthetics

Answer

Non-immobilizers

Answer

Cut-off effect

Question 4

Ketamine is useful as an anesthetic agent in which of the following conditions?

Accepted Answer

Hyperactive airways

Answer

Ischemic heart disease

Answer

Intracranial hemorrhage

Answer

Glaucoma

Question 5

Who demonstrated the anesthetic effect of ether?

Accepted Answer

Moon

Answer

Morgan

Answer

Priestly

Answer

None of the above

Question 6

Which of the following statements regarding depolarizing neuromuscular blocking drugs is true?

Accepted Answer

All of the above.

Answer

The depolarized muscle fibers are unresponsive to other stimuli.

Answer

Causes muscular fasciculations.

Answer

Is not reversed by neostigmine.

Question 7

Ketamine is NOT indicated in which of the following conditions?

Accepted Answer

Increased intracranial pressure

Answer

Full stomach

Answer

Pediatric patient

Answer

Asthma patient

Question 8

Which parenteral anesthetic produces profound analgesia?

Accepted Answer

Ketamine

Answer

Thiopental

Answer

Propofol

Answer

Etomidate

Question 9

Thiopentone is contraindicated in which of the following conditions?

Accepted Answer

Acute intermittent porphyria

Answer

Electroconvulsive therapy

Answer

Sarcoidosis

Answer

Diabetic patients

Question 10

Which opioid does not require kidney and liver for metabolism?

Accepted Answer

Remifentanyl

Answer

Sufentanil

Answer

Alfentanyl

Answer

Fentanyl

General Anesthesia — MCQs

General Anesthesia — MCQs

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