Ethiopian Anesthesia University Exit Exam Practice Questions and answers (50 Items)

Part 1: General Principles & Preoperative Assessment

Q1. A 55-year-old male with a history of unstable angina and a recent myocardial infarction (3 weeks ago) presents for an elective total hip arthroplasty. According to the ASA physical status classification, how should this patient be categorized? A) ASA II B) ASA III C) ASA IV D) ASA V

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• Correct Answer: C
• Rationale: ASA IV represents a patient with a severe systemic disease that is a constant threat to life. Unstable angina and a myocardial infarction within the past 3 months are classic criteria for an ASA IV classification.

Q2. During preoperative evaluation, a patient states they had a large solid meal 4 hours ago. According to the standard ASA fasting guidelines for elective procedures, what is the minimum fasting period required for solid food? A) 2 hours B) 4 hours C) 6 hours D) 8 hours

• Correct Answer: D
• Rationale: ASA guidelines recommend a minimum fasting period of 8 hours for a heavy or fatty meal, 6 hours for a light meal/milk, and 2 hours for clear liquids to minimize the risk of pulmonary aspiration.

Q3. Which of the following components of the anesthesia machine is specifically designed to prevent the delivery of a hypoxic gas mixture by ensuring the oxygen concentration does not drop below 25%? A) The vaporizer interlocking mechanism B) The hypoxic guard (proportioning system) C) The pressure-reducing valve D) The fail-safe valve

• Correct Answer: B
• Rationale: The hypoxic guard or proportioning system mechanically or pneumatically links the nitrous oxide and oxygen flowmeters to maintain a minimum oxygen concentration of 21% to 25% in the delivered gas mixture.

Q4. While performing a routine check of the anesthesia machine circle system, you notice the carbon dioxide absorbent granules (soda lime) have turned entirely purple. This color change indicates: A) The absorbent is fresh and ready for use B) The presence of volatile anesthetic degradation products C) Exhaustion of the absorbent capacity due to a pH drop D) An overdose of moisture in the canister

• Correct Answer: C
• Rationale: Soda lime contains an indicator dye (ethyl violet) that changes from colorless to purple as the pH drops below 10.3, signalling the accumulation of carbonic acid and exhaustion of its CO2​ absorption capacity.

Q5. A patient undergoing general anesthesia exhibits a sudden, rapid rise in end-tidal carbon dioxide (EtCO2​), severe muscle rigidity, tachycardia, and a temperature climbing at 1∘C every 5 minutes. What is the immediate definitive pharmacological treatment? A) Intravenous Succinylcholine B) Intravenous Dantrolene C) High-dose Amiodarone D) Rapid administration of cold saline only

• Correct Answer: B
• Rationale: The presentation is pathognomonic for Malignant Hyperthermia. Intravenous Dantrolene is the specific ryanodine receptor antagonist required to halt abnormal intracellular calcium release from the sarcoplasmic reticulum.

Q6. What is the primary physical principle behind the functioning of a variable-bypass vaporizer when compensating for changes in ambient temperature? A) A bimetallic strip alters the gas flow proportions based on temperature changes B) The total fresh gas flow automatically bypasses the vapor chamber entirely C) Temperature drops increase the ambient atmospheric pressure inside the block D) Liquid anesthetic expands to fill the expansion chamber

• Correct Answer: A
• Rationale: Variable-bypass vaporizers utilize a temperature-compensating valve (typically a bimetallic strip or expansion element) that adjusts the ratio of bypass gas to vapor-chamber gas as temperature alters the anesthetic’s vapor pressure.

Q7. An emergency patient requires immediate surgical intervention. The blood gas analysis reveals a severe metabolic acidosis with a high anion gap. Which of the following conditions is a primary cause of high anion gap metabolic acidosis? A) Severe diarrhea B) Diabetic ketoacidosis C) Renal tubular acidosis D) Excessive normal saline infusion

• Correct Answer: B
• Rationale: High anion gap metabolic acidosis is caused by the accumulation of unmeasured organic acids, such as ketoacids in diabetic ketoacidosis, lactic acid in shock, or exogenous toxins (MUDPILES).

Q8. During a surgical procedure under general anesthesia, the low-pressure circuit alarm on the anesthesia machine sounds. What is the most common site for a leak in this circuit? A) The oxygen pipeline inlet B) The high-pressure cylinder yoke C) The vaporizer mounting manifold or dial seals D) The scavenging interface valve

• Correct Answer: C
• Rationale: The low-pressure circuit downstream of the flowmeters is highly vulnerable to leaks, with the vaporizer mounting manifold, loose O-rings, or internal vaporizer seals being the most frequent sites of gas escape.

Q9. Which of the following monitoring modalities provides the earliest and most specific warning of an accidental esophageal intubation during general anesthesia? A) Continuous pulse oximetry (SpO2​) B) Precordial stethoscope auscultation C) Continuous waveform capnography (EtCO2​) D) Visual observation of chest rise

• Correct Answer: C
• Rationale: Waveform capnography is the gold standard for verifying endotracheal placement. The persistent absence of a characteristic CO2​ waveform over 3 to 4 consecutive breaths confirms incorrect (esophageal) placement.

Q10. A 68-year-old chronic smoker is scheduled for an elective laparotomy. Preoperative pulmonary optimization should ideally include smoking cessation for a minimum of how many weeks to reduce postoperative pulmonary complications? A) 24 to 48 hours B) 1 to 2 weeks C) 4 to 6 weeks D) 6 to 8 weeks

• Correct Answer: D
• Rationale: While stopping smoking for 48 hours decreases carboxyhemoglobin levels, a minimum of 6 to 8 weeks is required to normalize ciliary function, reduce sputum production, and significantly lower postoperative pulmonary risks.

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Part 2: Airway Management

Q11. During preoperative airway assessment, you ask the patient to sit straight, open their mouth fully, and protrude their tongue without phonating. You can visualize only the soft palate and the base of the uvula. How should this be classified according to the Modified Mallampati system? A) Class I B) Class II C) Class III D) Class IV

• Correct Answer: C
• Rationale: Modified Mallampati Class III allows visualization of the soft palate and the base of the uvula only. The faucial pillars and upper uvula are obscured, predicting a potentially difficult laryngoscopy.

Q12. What is the anatomical landmark used to guide the placement of the tip of a curved MacIntosh laryngoscope blade during direct laryngoscopy? A) The posterior surface of the epiglottis B) The vocal cords directly C) The vallecula D) The piriform sinus

• Correct Answer: C
• Rationale: The curved MacIntosh blade is designed to be inserted into the vallecula (the space between the base of the tongue and the epiglottis), indirectly elevating the epiglottis by tension on the hypoepiglottic ligament.

Q13. A 30-year-old trauma patient presents with severe maxillofacial fractures and a suspected unstable cervical spine injury. She requires immediate airway protection. Which technique is most appropriate to secure the airway while maintaining spine immobilization? A) Direct laryngoscopy with forceful neck extension B) Video laryngoscopy with manual in-line stabilization (MILS) C) Blind nasal intubation without checking for skull fractures D) Surgical cricothyroidotomy as the first-line option

• Correct Answer: B
• Rationale: Video laryngoscopy combined with manual in-line stabilization provides an optimal view of the glottis while minimizing cervical spine movement, making it safer than direct laryngoscopy in cervical trauma.

Q14. You are managing a difficult airway where face-mask ventilation is adequate, but multiple intubation attempts have failed. According to the ASA Difficult Airway Algorithm, what is the next most appropriate rescue airway device to insert? A) A combitube B) A supraglottic airway device (e.g., Laryngeal Mask Airway – LMA) C) A flexible fiberoptic bronchoscope immediately D) An emergency tracheostomy kit

• Correct Answer: B
• Rationale: When intubation fails but ventilation is possible, inserting a supraglottic airway device like an LMA serves as a reliable rescue step to maintain ventilation and oxygenation in the “cannot intubate, can ventilate” scenario.

Q15. What is the standard adult internal diameter size range for an endotracheal tube (ETT) typically used for an average-sized adult male and adult female patient respectively? A) Male: 6.0–6.5 mm; Female: 5.5–6.0 mm B) Male: 7.5–8.0 mm; Female: 7.0–7.5 mm C) Male: 8.5–9.0 mm; Female: 8.0–8.5 mm D) Male: 7.0–7.5 mm; Female: 7.5–8.0 mm

• Correct Answer: B
• Rationale: For average adults, an ETT with an internal diameter of 7.5–8.0 mm is standard for males, and 7.0–7.5 mm is standard for females, balance-matching airway resistance and mucosal pressure risk.

Q16. During a rapid sequence induction (RSI), an assistant applies firm downward pressure on the cricoid cartilage. What is the anatomical rationale for selecting the cricoid cartilage specifically for this maneuver? A) It is the only complete cartilaginous ring in the upper airway that can compress the underlying esophagus against the cervical vertebrae B) It directly opens the vocal cords wide C) It stimulates the vagus nerve to decrease heart rate D) It stabilizes the thyroid gland structures

• Correct Answer: A
• Rationale: The cricoid cartilage forms a complete ring. Applying downward pressure (Sellick’s maneuver) occludes the esophagus by compressing it against the bodies of the cervical vertebrae, preventing passive gastric regurgitation during induction.

Q17. A patient with severe rheumatoid arthritis demonstrates an atlantoaxial subluxation with a distance of 6 mm on flexion-extension radiographs. Which airway management technique is safest for this patient? A) Standard direct laryngoscopy B) Awake flexible fiberoptic intubation C) Rapid sequence induction with regular laryngoscopy D) Laryngeal mask airway as the primary long-term plan

• Correct Answer: B
• Rationale: Significant atlantoaxial subluxation poses a high risk of spinal cord injury during neck manipulation. An awake flexible fiberoptic intubation allows securing the airway while keeping the head and neck in a neutral position.

Q18. After securing an endotracheal tube, auscultation reveals loud breath sounds over the right lung field, absent breath sounds over the left lung, and asymmetric chest rise. What is the most likely cause? A) Acute left-sided pneumothorax B) Right endobronchial intubation C) Esophageal misplacement of the ETT D) Severe bilateral bronchospasm

• Correct Answer: B
• Rationale: The right mainstem bronchus takes a more vertical and wider path than the left. An over-advanced endotracheal tube will preferentially enter the right bronchus, causing unilateral breath sounds and requiring immediate tube retraction.

Q19. Which of the following clinical signs provides the most definitive confirmation of successful face-mask ventilation prior to administering a neuromuscular blocking agent? A) Flaccidity of the patient’s jaw muscles B) Condensation of water vapor inside the face mask faceplate C) Sustained rhythmic capnographic waveforms with acceptable tidal volumes D) A steady heart rate on the ECG monitor

• Correct Answer: C
• Rationale: While chest movement and condensation are helpful, a continuous capnography waveform combined with measured expiratory tidal volumes provides absolute confirmation of gas exchange and ventilation.

Q20. What is the maximal safe endotracheal tube cuff pressure range that should be maintained to prevent tracheal mucosal ischemia while sealing the airway effectively? A) 5–10 cm H2​O B) 20–30 cm H2​O C) 40–50 cm H2​O D) 60–80 cm H2​O

• Correct Answer: B
• Rationale: Tracheal mucosal capillary perfusion pressure ranges between 30 and 35 cm H2​O. Keeping the ETT cuff pressure between 20 and 30 cm H2​O seals the airway without causing tissue ischemia or stenosis.

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Part 3: Pharmacology in Anesthesia

Q21. A patient with severe underlying cardiac dysfunction requires induction of general anesthesia. Which intravenous induction agent is preferred due to its highly favorable hemodynamic profile and minimal cardiovascular depression? A) Propofol B) Thiopental C) Etomidate D) Ketamine

• Correct Answer: C
• Rationale: Etomidate preserves hemodynamic stability because it has minimal effects on myocardial contractility and systemic vascular resistance, making it ideal for patients with severe cardiovascular disease.

Q22. A patient with a family history of atypical plasma cholinesterase is scheduled for surgery. If given standard doses of Succinylcholine, what prolonged clinical complication should the anesthetist expect? A) Severe generalized grand mal seizures B) Prolonged neuromuscular blockade and apnea lasting hours C) Acute hyperkalemic cardiac arrest within minutes D) Severe chest wall muscle rigidity

• Correct Answer: B
• Rationale: Succinylcholine is metabolized by plasma cholinesterase (butyrylcholinesterase). Patients with atypical variants cannot metabolize the drug efficiently, leading to prolonged neuromuscular blockade and extended apnea requiring continued mechanical ventilation.

Q23. Which neuromuscular blocking agent undergoes spontaneous degradation via Hoffman elimination, rendering its clearance entirely independent of hepatic or renal function? A) Vecuronium B) Pancuronium C) Cisatracurium D) Rocuronium

• Correct Answer: C
• Rationale: Cisatracurium and atracurium undergo Hoffman elimination—a spontaneous, non-enzymatic degradation at physiological temperature and pH—making them highly useful for patients with renal or liver failure.

Q24. A patient experiences severe postoperative opioid-induced respiratory depression (respiratory rate = 4 breaths/minute). What specific pharmacological antagonist should be administered to reverse this effect? A) Flumazenil B) Neostigmine C) Naloxone D) Sugammadex

• Correct Answer: C
• Rationale: Naloxone is a competitive opioid receptor antagonist that reverses the sedative and respiratory depressant effects of opioids by displacing them from μ-receptors.

Q25. What is the specific mechanism of action of Sugammadex when reversing a dense neuromuscular blockade induced by Rocuronium or Vecuronium? A) It competitively inhibits the acetylcholinesterase enzyme at the neuromuscular junction B) It encapsulates and encapsulates the aminosteroid muscle relaxant molecule in the plasma, neutralizing it directly C) It blocks presynaptic calcium channels to stimulate acetylcholine release D) It acts as a direct nicotinic receptor agonist

• Correct Answer: B
• Rationale: Sugammadex is a modified gamma-cyclodextrin that acts as a selective relaxant binding agent. It encapsulates aminosteroid molecules like rocuronium in a 1:1 ratio, removing them from the neuromuscular junction.

Q26. Which inhalation anesthetic has the lowest blood-gas partition coefficient, leading to the fastest induction and emergence profiles among modern volatile agents? A) Isoflurane B) Halothane C) Desflurane D) Sevoflurane

• Correct Answer: C
• Rationale: Desflurane has a very low blood-gas partition coefficient (≈0.42), meaning it dissolves poorly in blood, leading to rapid changes in alveolar concentration and fast induction and emergence.

Q27. A 25-year-old female experiences severe postoperative nausea and vomiting (PONV) after a laparoscopic cholecystectomy. Which receptor class is targeted by Ondansetron to prevent and treat PONV? A) H1​ histamine receptors B) 5−HT3​ serotonin receptors C) D2​ dopamine receptors D) α2​ adrenergic receptors

• Correct Answer: B
• Rationale: Ondansetron is a selective 5−HT3​ serotonin receptor antagonist that acts both peripherally on vagal nerve terminals and centrally in the chemoreceptor trigger zone to suppress vomiting.

Q28. What is the maximum safe dose of local infiltration with plain Lidocaine (without epinephrine) and Lidocaine with epinephrine respectively, to avoid systemic toxicity? A) Plain: 3 mg/kg; With Epinephrine: 5 mg/kg B) Plain: 4.5 mg/kg; With Epinephrine: 7 mg/kg C) Plain: 7 mg/kg; With Epinephrine: 10 mg/kg D) Plain: 5 mg/kg; With Epinephrine: 9 mg/kg

• Correct Answer: B
• Rationale: The traditional maximum safe single dose for plain lidocaine is 4.5 mg/kg (not to exceed 300 mg) and 7 mg/kg when combined with epinephrine (not to exceed 500 mg), as epinephrine delays vascular absorption.

Q29. A patient accidentally receives an overdose of Bupivacaine during a regional block and develops local anesthetic systemic toxicity (LAST), progressing to refractory ventricular arrhythmias. What is the immediate antidote? A) Intravenous Lidocaine infusion B) 20% Intravenous Lipid Emulsion (Intralipid) C) High-dose Esmolol injection D) Magnesium sulfate bolus

• Correct Answer: B
• Rationale: Lipid emulsion therapy (20% Intralipid) acts as a “lipid sink,” extracting lipophilic local anesthetics like bupivacaine from cardiac tissue and restoring normal myocardial function.

Q30. Which induction agent is associated with a high incidence of emergence delirium, vivid hallucinations, and increases systemic blood pressure and heart rate via sympathetic stimulation? A) Midazolam B) Propofol C) Ketamine D) Thiopental

• Correct Answer: C
• Rationale: Ketamine causes a dissociative anesthetic state. Its indirect sympathomimetic effects increase heart rate and blood pressure, and it carries a high risk of emergence delirium and hallucinations.

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Part 4: Regional Anesthesia & Analgesia

Q31. During the performance of a lumbar spinal (subarachnoid) anesthesia, what is the correct anatomical order of tissue layers a spinal needle traverses from the skin surface to the subarachnoid space? A) Skin → Subcutaneous tissue → Interspinous ligament → Supraspinous ligament → Ligamentum flavum → Dura mater → Arachnoid mater B) Skin → Subcutaneous tissue → Supraspinous ligament → Interspinous ligament → Ligamentum flavum → Epidural space → Dura mater → Arachnoid mater C) Skin → Ligamentum flavum → Interspinous ligament → Dura mater → Subarachnoid space D) Skin → Supraspinous ligament → Dura mater → Epidural space → Arachnoid mater

• Correct Answer: B
• Rationale: A midline approach passes through the skin, subcutaneous fat, supraspinous ligament, interspinous ligament, ligamentum flavum, epidural space, dura mater, and the arachnoid mater to enter the subarachnoid space.

Q32. A 28-year-old patient develops a severe, throbbing fronto-occipital headache 24 hours after an uneventful spinal anesthetic. The headache worsens significantly when upright and resolves when lying flat. What is the first-line definitive treatment if conservative management fails? A) High-dose oral ibuprofen B) An epidural blood patch C) Continuous intravenous heparin infusion D) Repeated lumbar punctures to reduce pressure

• Correct Answer: B
• Rationale: The symptoms describe a post-dural puncture headache (PDPH). If conservative therapies (hydration, caffeine, analgesics) fail, an epidural blood patch using autologous blood seals the dural leak.

Q33. What is the most immediate and common cardiovascular physiological response observed following a high thoracic spinal block due to the blockade of sympathetic preganglionic fibers? A) Severe hypertension and tachycardia B) Profound hypotension and bradycardia C) Isolated diastolic hypertension with normal heart rate D) Compensatory generalized vasoconstriction

• Correct Answer: B
• Rationale: High spinal anesthesia blocks sympathetic preganglionic fibers (T1–L2). If the blockade reaches the T1–T4 cardioaccelerator fibers, it leads to venous pooling, a drop in systemic vascular resistance, and bradycardia.

Q34. When performing an interscalene brachial plexus block for shoulder surgery, which nerve root is typically spared, making this block inadequate for hand or wrist surgery? A) C5 B) C6 C) C7 D) T1

• Correct Answer: D
• Rationale: An interscalene block targets the roots/trunks of the brachial plexus (C5–C7). It frequently spares the T1 root (and parts of C8), making it unsuitable for procedures on the medial aspect of the forearm and hand.

Q35. A patient undergoes an elective hernia repair under spinal anesthesia using hyperbaric Bupivacaine. To optimize the block level and allow the local anesthetic to settle dependently in the thoracic curvature, the patient should be positioned: A) In a steep Reverse Trendelenburg position B) Completely flat in the supine position C) In a steep Trendelenburg position immediately D) In a prone jackknife position

• Correct Answer: B
• Rationale: Hyperbaric solutions are denser than CSF. When a patient is placed supine, the solution flows to the lowest points of the spinal column (typically the thoracic curve at T4–T8), defining the sensory block height.

Q36. Which local anesthetic is an ester derivative and is primarily metabolized by tissue plasma pseudo-cholinesterases rather than hepatic microsomal enzymes? A) Procaine B) Ropivacaine C) Levobupivacaine D) Prilocaine

• Correct Answer: A
• Rationale: Local anesthetics are divided into amides and esters. Procaine, chloroprocaine, and tetracaine are esters metabolized by plasma pseudo-cholinesterase, unlike amide agents which undergo hepatic metabolism.

Q37. While performing an epidural block using the “loss of resistance” technique with saline, a sudden drop in resistance is felt. This change indicates the needle tip has passed through which structure into the epidural space? A) Supraspinous ligament B) Interspinous ligament C) Ligamentum flavum D) Dura mater

• Correct Answer: C
• Rationale: The ligamentum flavum is a dense, fibrous structure that offers substantial resistance to injection. Passing through it results in a distinct loss of resistance, indicating entry into the epidural space.

Q38. What is the primary purpose of adding Epinephrine (1:200,000) to a local anesthetic solution used for peripheral nerve blocks? A) To lower the pH of the solution and accelerate onset B) To cause localized vasoconstriction, reducing systemic absorption, prolonging block duration, and serving as an indicator for intravascular injection C) To act as a direct competitive antagonist at central pain receptors D) To prevent allergic reactions to amide local anesthetics

• Correct Answer: B
• Rationale: Epinephrine acts as a vasoconstrictor, slowing systemic absorption to prolong block duration and minimize toxicity risk. It also serves as an intravascular marker by triggering tachycardia if injected into a vessel.

Q39. An absolute contraindication to performing any neuraxial (spinal or epidural) block in an elective surgical patient is: A) History of a well-controlled hypertensive disorder B) Patient refusal or lack of informed consent C) Mild localized osteoarthritis of the lumbar spine D) Chronic controlled diabetes mellitus

• Correct Answer: B
• Rationale: Patient refusal is an absolute contraindication for any regional procedure. Other absolute contraindications include infection at the injection site, severe uncorrected hypovolemia, and coagulopathy.

Q40. A patient experiences pricking sensations, severe agitation, a metallic taste, circumoral numbness, and visual disturbances during the injection of an epidural bolus. What is the immediate mechanism driving these features? A) High spinal blockade extending to the brainstem B) Allergic anaphylactic reaction to the preservative chemical C) Accidental intravascular injection causing Local Anesthetic Systemic Toxicity (LAST) D) Acute psychogenic hyperventilation syndrome

• Correct Answer: C
• Rationale: Circumoral numbness, tinnitus, a metallic taste, and central nervous system excitation are classic early signs of LAST, resulting from accidental direct intravascular delivery of the local anesthetic.

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Part 5: Obstetric Anesthesia

Q41. A pregnant woman at 38 weeks gestation is placed in a flat supine position on the operating table. She quickly becomes hypotensive, tachycardic, and complains of dizziness. What is the pathophysiological cause? A) Acute amniotic fluid embolism syndrome B) Aortocaval compression by the gravid uterus reducing venous return C) Pre-eclampsia-induced vascular collapse D) Sudden high sympathetic nervous system discharge

• Correct Answer: B
• Rationale: In the supine position, the gravid uterus compresses the inferior vena cava and abdominal aorta, reducing venous return to the heart and leading to supine hypotensive syndrome.

Q42. Why is a pregnant woman considered to have a “full stomach” and a high risk for pulmonary aspiration from the second trimester onward, regardless of her fasting status? A) Progesterone decreases lower esophageal sphincter tone and slows gastric emptying B) Estrogen increases total stomach acid volume tenfold C) Mechanical compression by the uterus accelerates gastric motility D) Pregnant women have a higher baseline requirement for heavy foods

• Correct Answer: A
• Rationale: High progesterone levels relax smooth muscle, reducing lower esophageal sphincter tone and delaying gastric emptying. This, combined with increased intra-abdominal pressure from the uterus, elevates aspiration risk.

Q43. A parturient with severe pre-eclampsia is receiving an intravenous magnesium sulfate infusion for seizure prophylaxis. During a routine assessment, you note absent deep tendon reflexes and respiratory depression. What is the immediate treatment? A) Administer more Magnesium sulfate to achieve a therapeutic level B) Infuse Intravenous Calcium Gluconate (10%, 10 mL over 5-10 mins) C) Administer high doses of Succinylcholine D) Intubate the patient immediately without stopping the magnesium

• Correct Answer: B
• Rationale: Loss of deep tendon reflexes is an early sign of magnesium toxicity. Calcium gluconate is the direct physiological antagonist used to reverse the neuromuscular and respiratory effects of excess magnesium.

Q44. Which induction agent should be avoided or used with extreme caution in a pregnant patient requiring general anesthesia for a non-obstetric procedure due to concerns regarding direct uterine vasoconstriction and potential fetal hypoxemia? A) Propofol B) Etomidate C) High-dose Ketamine (>2 mg/kg) D) Thiopental

• Correct Answer: C
• Rationale: High doses of ketamine (>2 mg/kg) can cause uterine hypertonus and vasoconstriction, compromising uteroplacental blood flow and risking fetal asphyxia.

Q45. What is the drug of choice for treating hypotension following spinal anesthesia for an elective Cesarean delivery due to its favorable fetal umbilical artery pH profile compared to Ephedrine? A) Phenylephrine B) Norepinephrine infusion directly C) High-dose Dobutamine D) Atropine bolus

• Correct Answer: A
• Rationale: Phenylephrine, a pure alpha-1 agonist, is the preferred agent for spinal-induced hypotension in obstetrics. Unlike ephedrine, it does not undergo significant placental transfer that can trigger fetal metabolic acidosis.

Q46. A pregnant patient requires emergency general anesthesia for a crash Cesarean section due to cord prolapse. What modification to the standard induction protocol is mandatory? A) Awake fiberoptic intubation as the default first-line option B) Rapid Sequence Induction (RSI) with cricoid pressure and a smaller endotracheal tube C) Inhalation induction with Halothane to relax the uterus D) Insertion of an LMA instead of an endotracheal tube

• Correct Answer: B
• Rationale: Full stomach status and airway edema require a rapid sequence induction with cricoid pressure. Hormonal changes also narrow the glottic opening, necessitating a smaller tube (e.g., 6.5 or 7.0 mm).

Q47. Which uterine contraction stimulant used to treat postpartum hemorrhage is strictly contraindicated in patients with underlying chronic or pregnancy-induced hypertensive disorders? A) Oxytocin B) Methylergonovine (Methergine) C) Carboprost (Hemabate) D) Misoprostol

• Correct Answer: B
• Rationale: Methylergonovine is an ergot alkaloid that causes intense generalized vasoconstriction and can trigger severe, acute hypertensive crises in patients with pre-existing hypertension or pre-eclampsia.

Q48. A parturient requires general anesthesia. You note that the Minimum Alveolar Concentration (MAC) of volatile anesthetics is altered during pregnancy. How does pregnancy impact MAC values? A) MAC increases by 50% due to hyperventilation B) MAC remains completely unchanged C) MAC decreases by approximately 30% to 40% due to increased progesterone and endogenous endorphins D) MAC fluctuates every hour based on fetal movement

• Correct Answer: C
• Rationale: Sedative effects from increased progesterone and beta-endorphins lower the MAC of volatile anesthetics by 30% to 40% during pregnancy, increasing sensitivity to inhalation agents.

Q49. What type of nerve block can be performed by an obstetrician just before delivery to provide effective anesthesia to the perineum and lower vagina during a difficult vacuum extraction? A) Paravertebral block B) Pudendal nerve block C) Celiac plexus block D) Femoral nerve block

• Correct Answer: B
• Rationale: The pudendal nerve (S2–S4) supplies the perineum and lower vagina. A bilateral pudendal block provides targeted analgesia for operative vaginal deliveries and episiotomies.

Q50. A neonate delivered via elective Cesarean section demonstrates poor muscle tone, a heart rate of 80 beats per minute, and irregular, gasping respirations at 1 minute of life. What is the immediate next step in neonatal resuscitation? A) Administer intravenous Epinephrine via the umbilical vein B) Provide positive-pressure ventilation (PPW) with room air or 21-30% O2​ using a T-piece or bag-mask for 30 seconds C) Initiate immediate external chest compressions at a 3:1 ratio D) Slap the baby’s feet forcefully for 2 minutes

• Correct Answer: B
• Rationale: In neonatal resuscitation, if the newborn remains apneic or has a heart rate <100 bpm after initial drying and stimulation, initiating effective positive-pressure ventilation is the most critical next step.