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ACVAA practice questions

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Question 1Veterinary Anesthesia

Which agent is most appropriate for premedication in a healthy, fractious dog that requires handling for intravenous catheter placement?

  1. Acepromazine
  2. Glycopyrrolate
  3. Dexmedetomidine Correct answer.
  4. Midazolam

Explanation

Alpha-2 agonists such as dexmedetomidine produce rapid, reliable sedation with dose-dependent analgesia and are well suited to calming an agitated patient before handling. Acepromazine has a slower onset and can cause hypotension without providing analgesia. Benzodiazepines alone are often insufficient to sedate a fractious patient.

Question 2Veterinary Anesthesia

Which inhalant anesthetic has the lowest blood-gas partition coefficient and therefore the fastest induction and recovery?

  1. Sevoflurane
  2. Isoflurane
  3. Desflurane Correct answer.
  4. Halothane

Explanation

A low blood-gas partition coefficient means the agent equilibrates rapidly between blood and alveoli, producing fast induction and recovery. Desflurane has the lowest blood-gas solubility of the volatile agents in common use. Halothane has the highest solubility and the slowest kinetics.

Question 3Veterinary Anesthesia

What is the primary purpose of preoxygenation before induction of anesthesia in a dog?

  1. To reduce the minimum alveolar concentration of the induction agent
  2. To decrease vagal tone during intubation
  3. To prevent diffusion hypoxia during recovery
  4. To increase functional residual capacity of oxygen to prolong safe apnea time Correct answer.

Explanation

Preoxygenation replaces alveolar nitrogen with oxygen, increasing the oxygen reservoir in the functional residual capacity so that hemoglobin desaturation is delayed during apnea at induction. It does not change MAC or vagal tone. Diffusion hypoxia is a recovery-phase concern unrelated to preoxygenation.

Question 4Veterinary Anesthesia

Which monitoring finding most directly indicates that a patient is under an inadequate depth of anesthesia during surgery?

  1. End-tidal CO2 rising from 40 to 45 mmHg
  2. Body temperature falling from 38.0 to 37.5 degrees Celsius
  3. Arterial blood pressure rising with increased respiratory effort Correct answer.
  4. Heart rate decreasing from 120 to 80 beats per minute

Explanation

Increasing blood pressure accompanied by respiratory effort or movement reflects sympathetic activation and inadequate anesthetic depth. Decreasing heart rate and stable end-tidal CO2 suggest adequate or deepening anesthesia. Progressive hypothermia is a consequence of anesthesia rather than a sign of depth.

Question 5Veterinary Anesthesia

Which condition is a contraindication to the use of acepromazine as a premedicant?

  1. Known von Willebrand disease
  2. History of seizure activity Correct answer.
  3. Brachycephalic conformation
  4. Mild obesity

Explanation

Acepromazine lowers the seizure threshold and is traditionally avoided in patients with a history of epilepsy or seizure activity. Obesity, brachycephalic conformation, and von Willebrand disease are not absolute contraindications, though the last may warrant caution with other agents.

Question 6Veterinary Anesthesia

Which intravenous fluid is most appropriate for initial resuscitation of a hypovolemic dog with a low blood pressure and prolonged capillary refill time?

  1. Balanced isotonic crystalloid Correct answer.
  2. Hypertonic saline alone
  3. 5% dextrose in water
  4. Potassium-supplemented maintenance fluid

Explanation

Balanced isotonic crystalloids are the first-line resuscitation fluid because they rapidly expand the extracellular volume and restore perfusion. Hypertonic saline is used in small volumes as an adjunct, not alone. Dextrose water and potassium-supplemented fluids do not provide effective volume resuscitation.

Question 7Veterinary Anesthesia

Which nerve block provides analgesia for the forelimb distal to the elbow during surgery?

  1. Femoral nerve block
  2. Sciatic nerve block
  3. Lumbosacral epidural
  4. Brachial plexus block Correct answer.

Explanation

The brachial plexus block anesthetizes the nerves supplying the forelimb and is used for procedures distal to the elbow. Femoral and sciatic blocks target the hindlimb. A lumbosacral epidural provides analgesia to the pelvic limbs, perineum, and caudal abdomen.

Question 8Veterinary Anesthesia

Which agent is used to reverse the effects of dexmedetomidine?

  1. Naloxone
  2. Flumazenil
  3. Atipamezole Correct answer.
  4. Yohimbine

Explanation

Atipamezole is a selective alpha-2 antagonist that reverses alpha-2 agonists such as dexmedetomidine. Naloxone reverses opioids and flumazenil reverses benzodiazepines. Yohimbine is also an alpha-2 antagonist but is less selective and less commonly used for this purpose in small animals.

Question 9Veterinary Anesthesia

Which parameter best reflects adequate ventilation during anesthesia when capnography is unavailable?

  1. Respiratory rate and tidal volume assessment Correct answer.
  2. Body temperature
  3. Mucous membrane color
  4. Arterial blood pressure

Explanation

Ventilation is assessed by respiratory rate combined with an estimate of tidal volume, such as chest excursion or a reservoir bag observation. Mucous membrane color and blood pressure reflect oxygenation and perfusion, not ventilation directly. Temperature is unrelated to ventilation.

Question 10Veterinary Anesthesia

A dog undergoing anesthesia with isoflurane has a sudden rise in end-tidal CO2 with a falling blood pressure and increasing heart rate. Which action is most appropriate?

  1. Assess the patient for hypoventilation and assist ventilation Correct answer.
  2. Administer a bolus of crystalloid and continue monitoring
  3. Deepen anesthesia by increasing the vaporizer setting
  4. Reduce the fresh gas flow and continue monitoring

Explanation

A rising end-tidal CO2 indicates hypoventilation, which can be corrected by assisting ventilation. The concurrent tachycardia and hypotension suggest the patient is responding to hypercapnia, so deepening anesthesia would worsen the problem. Fluid bolus and reducing fresh gas flow do not address the primary ventilatory issue.

Question 11Veterinary Anesthesia

Which statement about the minimum alveolar concentration (MAC) of an inhalant anesthetic is correct?

  1. MAC is the concentration at which 50% of patients do not respond to a noxious stimulus Correct answer.
  2. MAC is the concentration at which all patients remain immobile during surgery
  3. MAC is unaffected by the patient's body temperature
  4. MAC is inversely related to the agent's blood solubility

Explanation

MAC is defined as the alveolar concentration at which 50% of patients do not respond to a standardized noxious stimulus. It is a population median, not a guarantee of immobility for an individual. MAC is influenced by temperature and other factors, and it is not defined by blood solubility.

Question 12Veterinary Anesthesia

Which analgesic approach provides the greatest benefit for a dog undergoing orthopedic surgery when used as part of a multimodal plan?

  1. A single high dose of an opioid given at induction
  2. An NSAID given only in the postoperative period
  3. Intermittent boluses of an anticholinergic
  4. A local anesthetic block combined with systemic analgesia Correct answer.

Explanation

Multimodal analgesia combines techniques acting at different points in the pain pathway, and a local block with systemic analgesia reduces intraoperative and postoperative pain. A single opioid dose provides limited duration. NSAIDs alone are insufficient for severe orthopedic pain, and anticholinergics have no analgesic effect.

Question 13Veterinary Anesthesia

Which finding is most consistent with malignant hyperthermia during anesthesia?

  1. Gradual decline in temperature with bradycardia
  2. Sudden rise in end-tidal CO2 with muscle rigidity and hyperthermia Correct answer.
  3. Slow deepening of anesthesia with stable vital signs
  4. Progressive hypotension responsive to fluid therapy

Explanation

Malignant hyperthermia presents with a sudden rise in end-tidal CO2 from hypermetabolism, muscle rigidity, and hyperthermia. It is an emergency requiring discontinuation of triggering agents and specific treatment. The other findings describe expected or unrelated events.

Question 14Veterinary Anesthesia

Which opioid is most appropriate when a long duration of analgesia is desired in a dog after major surgery?

  1. Morphine Correct answer.
  2. Alfentanil
  3. Fentanyl
  4. Remifentanil

Explanation

Morphine provides analgesia lasting several hours and is suitable for postoperative pain management. Fentanyl, remifentanil, and alfentanil are short-acting and typically used as continuous infusions or for brief periods.

Question 15Veterinary Anesthesia

Which change is expected in a patient receiving a high dose of an alpha-2 agonist for sedation?

  1. Increased cardiac output and decreased systemic vascular resistance
  2. Tachycardia with decreased systemic vascular resistance
  3. Bradycardia with increased systemic vascular resistance Correct answer.
  4. Increased heart rate with no change in vascular resistance

Explanation

Alpha-2 agonists cause bradycardia and peripheral vasoconstriction, raising systemic vascular resistance while reducing cardiac output. They do not typically increase cardiac output or cause tachycardia.

Question 16Veterinary Anesthesia

A cat is anesthetized with a chamber induction using sevoflurane. Which complication is most likely to occur with this technique?

  1. Hyperthermia from the volatile agent
  2. Immediate cardiac arrest from the agent
  3. Breath-holding and excitement during induction Correct answer.
  4. Excessive salivation from the volatile agent

Explanation

Chamber induction with volatile agents can cause breath-holding, excitement, and stress because the patient is exposed to an unfamiliar environment and irritating vapor. It does not typically cause hyperthermia or immediate cardiac arrest. Salivation is not a characteristic effect of sevoflurane.

Question 17Veterinary Anesthesia

Which agent is most appropriate for induction of anesthesia in a dog with a severely compromised cardiovascular system?

  1. Thiopental
  2. Etomidate Correct answer.
  3. Ketamine at a high dose
  4. Propofol at a high dose

Explanation

Etomidate provides cardiovascular stability and is favored for induction in patients with cardiac compromise. High-dose propofol and thiopental cause significant hypotension. Ketamine at high doses increases sympathetic tone and myocardial oxygen demand, which may be undesirable in a compromised patient.

Question 18Veterinary Anesthesia

Which statement about the use of nitrous oxide in veterinary anesthesia is correct?

  1. It provides strong analgesia at low concentrations
  2. It is the most potent inhalant available
  3. It reduces the required concentration of the primary inhalant Correct answer.
  4. It has no effect on the oxygen concentration delivered

Explanation

Nitrous oxide has a low MAC and acts as a second gas to reduce the concentration of the primary inhalant needed, which is its main advantage. It provides weak analgesia at best and is not the most potent inhalant. It dilutes the delivered oxygen concentration, which must be monitored.

Question 19Veterinary Anesthesia

Which monitoring method provides the most reliable assessment of arterial oxygenation in an anesthetized patient?

  1. Capnography
  2. Mucous membrane color
  3. Pulse oximetry
  4. Arterial blood gas analysis Correct answer.

Explanation

Arterial blood gas analysis directly measures the partial pressure of oxygen in arterial blood and is the most reliable assessment of oxygenation. Pulse oximetry estimates saturation and can be affected by poor perfusion. Capnography reflects ventilation, and mucous membrane color is subjective.

Question 20Veterinary Anesthesia

Which effect is expected when atropine is administered to a dog during anesthesia?

  1. Increased salivation
  2. Reduced bronchial secretions Correct answer.
  3. Increased gastrointestinal motility
  4. Decreased heart rate

Explanation

Atropine is an anticholinergic that reduces bronchial and salivary secretions and increases heart rate. It does not increase salivation or gastrointestinal motility.

Question 21Veterinary Anesthesia

A dog with a history of a seizure disorder requires anesthesia. Which inhalant agent is preferred to minimize proconvulsant effects?

  1. Halothane
  2. Enflurane
  3. Isoflurane
  4. Sevoflurane Correct answer.

Explanation

Sevoflurane is generally preferred in patients with seizure disorders because it has less proconvulsant activity than enflurane. Enflurane is associated with epileptiform activity. Isoflurane and halothane are also used but are less commonly selected for this specific concern.

Question 22Veterinary Anesthesia

Which statement about the use of a constant rate infusion of lidocaine in a dog is correct?

  1. It provides analgesia and reduces the minimum alveolar concentration Correct answer.
  2. It is contraindicated in all patients with cardiac disease
  3. It has no effect on the minimum alveolar concentration
  4. It is used primarily for its antiarrhythmic and prokinetic effects

Explanation

Lidocaine administered as a constant rate infusion provides systemic analgesia and reduces the minimum alveolar concentration of inhalant anesthetics. It is also used for antiarrhythmic purposes but not primarily for prokinetic effects. It is not absolutely contraindicated in all cardiac patients.

Question 23Veterinary Anesthesia

Which finding is most consistent with a vagal response during intubation of a dog?

  1. Hyperthermia and tachypnea
  2. Tachycardia and hypertension
  3. Hypertension and mydriasis
  4. Bradycardia and hypotension Correct answer.

Explanation

Vagal stimulation during intubation can cause bradycardia and hypotension, which may require treatment with an anticholinergic. Tachycardia and hypertension suggest sympathetic stimulation rather than a vagal response. Hyperthermia and mydriasis are unrelated.

Question 24Veterinary Anesthesia

Which statement about the use of a lumbosacral epidural in a dog is correct?

  1. It provides analgesia to the thoracic limbs
  2. It has no effect on the minimum alveolar concentration
  3. It provides analgesia to the pelvic limbs and caudal abdomen Correct answer.
  4. It is contraindicated in all patients with pelvic limb surgery

Explanation

A lumbosacral epidural anesthetizes nerve roots supplying the pelvic limbs, perineum, and caudal abdomen, and it reduces the minimum alveolar concentration. It does not affect the thoracic limbs. It is not contraindicated in pelvic limb surgery; it is often used for that purpose.

Question 25Veterinary Anesthesia

Which statement about the use of a non-rebreathing system in a small patient is correct?

  1. It is suitable for patients weighing more than 20 kg
  2. It conserves anesthetic gas more efficiently than a rebreathing system
  3. It reduces the resistance to breathing compared with a rebreathing system Correct answer.
  4. It eliminates the need for a scavenging system

Explanation

Non-rebreathing systems have low resistance and minimal dead space, which suits small patients. They do not conserve gas efficiently and are not intended for large patients. A scavenging system is still required to protect personnel from waste gas.

Question 26Veterinary Anesthesia

Which premedication drug class is most commonly used to provide sedation and analgesia while reducing the required dose of induction agent in a healthy dog?

  1. Barbiturates
  2. Anticholinergics
  3. Opioids Correct answer.
  4. Phenothiazines

Explanation

Opioids provide dose-dependent sedation and analgesia and produce synergistic reductions in induction agent requirements when combined with other premedicants. This opioid-sparing effect is a core reason they are included in premedication protocols.

Question 27Veterinary Anesthesia

In a healthy dog, which physical finding is the most reliable indicator that an endotracheal tube has been placed in the trachea rather than the esophagus?

  1. Presence of condensation on the tube connector
  2. Absence of an audible leak around the cuff
  3. Resistance felt during advancement of the tube
  4. Bilateral thoracic excursions with breath sounds and no gastric distension Correct answer.

Explanation

Correct tracheal placement produces symmetric chest wall movement and breath sounds with no abdominal distension. Confirming placement by observation of thoracic excursion and breath sounds is the standard bedside check.

Question 28Veterinary Anesthesia

Which monitoring device directly measures the percentage of hemoglobin saturated with oxygen in arterial blood?

  1. Pulse oximeter Correct answer.
  2. Esophageal stethoscope
  3. Doppler flow detector
  4. Capnograph

Explanation

A pulse oximeter estimates arterial hemoglobin oxygen saturation by comparing light absorption at two wavelengths. It provides a continuous noninvasive estimate of oxygenation.

Question 29Veterinary Anesthesia

Which term describes the volume of gas moved into and out of the lungs in one normal breath?

  1. Functional residual capacity
  2. Vital capacity
  3. Tidal volume Correct answer.
  4. Residual volume

Explanation

Tidal volume is the volume inhaled or exhaled during a single unforced breath. It is the primary volume setting used during controlled ventilation.

Question 30Veterinary Anesthesia

Which drug is a benzodiazepine commonly used for sedation, muscle relaxation, and seizure control in veterinary patients?

  1. Midazolam Correct answer.
  2. Atropine
  3. Ketamine
  4. Propofol

Explanation

Midazolam is a benzodiazepine that produces sedation, anxiolysis, muscle relaxation, and anticonvulsant effects. It is often combined with other agents to reduce their required doses.

Question 31Veterinary Anesthesia

Which statement best describes the purpose of preoxygenation before induction of anesthesia in a high-risk patient?

  1. It reduces the minimum alveolar concentration of the inhalant
  2. It increases the reserve of oxygen in the lungs to prolong safe apnea time Correct answer.
  3. It accelerates the elimination of inhalant anesthetic
  4. It prevents aspiration of gastric contents

Explanation

Preoxygenation replaces nitrogen in the functional residual capacity with oxygen, creating a larger oxygen reservoir. This prolongs the time before desaturation occurs during apnea at induction.

Question 32Veterinary Anesthesia

Which route is typically used to administer a reversal agent for a non-depolarizing neuromuscular blocking drug at the end of anesthesia?

  1. Subcutaneous
  2. Oral
  3. Intravenous Correct answer.
  4. Intramuscular

Explanation

Reversal agents for neuromuscular blockade are given intravenously to achieve rapid, predictable effect. Intravenous administration allows titration against monitored neuromuscular function.

Question 33Veterinary Anesthesia

Which condition is a common cause of a decreased end-tidal carbon dioxide reading during anesthesia?

  1. Malignant hyperthermia
  2. Hyperventilation Correct answer.
  3. Rebreathing of carbon dioxide
  4. Hypoventilation

Explanation

End-tidal carbon dioxide reflects alveolar ventilation, so increased ventilation lowers the reading. Hyperventilation increases carbon dioxide removal and reduces end-tidal values.

Question 34Veterinary Anesthesia

A dog is receiving a constant rate infusion of morphine postoperatively. Which adverse effect should be monitored most closely?

  1. Hyperglycemia
  2. Hypertension
  3. Respiratory depression Correct answer.
  4. Polyuria

Explanation

Morphine is a mu-opioid agonist that can produce dose-dependent respiratory depression, particularly when combined with inhalants. Monitoring respiratory rate and effort is essential during opioid infusions.

Question 35Veterinary Anesthesia

Which inhalant anesthetic has the lowest blood solubility and therefore the fastest induction and recovery among the commonly used volatile agents?

  1. Isoflurane
  2. Sevoflurane
  3. Desflurane Correct answer.
  4. Halothane

Explanation

Desflurane has the lowest blood-gas partition coefficient of the volatile agents, so equilibration with blood is rapid. This produces the fastest uptake and elimination, giving rapid induction and recovery.

Question 36Veterinary Anesthesia

A dog with a grade III systolic murmur undergoes anesthesia. Which hemodynamic goal is most important to maintain during the procedure?

  1. Minimize systemic vascular resistance
  2. Reduce preload with aggressive fluid loading
  3. Preserve myocardial contractility and coronary perfusion Correct answer.
  4. Maximize heart rate

Explanation

In a patient with significant cardiac disease, maintaining contractility and coronary perfusion preserves cardiac output and oxygen delivery. Avoiding marked hypotension is central to safe anesthesia in these patients.

Question 37Veterinary Anesthesia

Which agent is a centrally acting alpha-2 agonist that also provides analgesia in addition to sedation?

  1. Dexmedetomidine Correct answer.
  2. Propofol
  3. Glycopyrrolate
  4. Acepromazine

Explanation

Dexmedetomidine is a selective alpha-2 agonist that produces sedation, muscle relaxation, and analgesia. Its analgesic component distinguishes it from many other sedatives.

Question 38Veterinary Anesthesia

During positive pressure ventilation, which change would you expect if the patient's compliance decreases while tidal volume is held constant?

  1. Peak inspiratory pressure increases Correct answer.
  2. Heart rate increases
  3. End-tidal carbon dioxide decreases
  4. Peak inspiratory pressure decreases

Explanation

Compliance describes the change in volume per unit change in pressure. If compliance falls while tidal volume is fixed, a higher pressure is required to deliver that volume.

Question 39Veterinary Anesthesia

Which statement about the use of a local anesthetic for a peripheral nerve block is correct?

  1. It acts primarily on the central nervous system
  2. It abolishes motor function only
  3. It provides analgesia by blocking sodium channels in nerves Correct answer.
  4. It requires systemic absorption to be effective

Explanation

Local anesthetics block voltage-gated sodium channels, preventing depolarization and conduction in nerve fibers. This produces regional analgesia and, at higher concentrations, motor blockade.

Question 40Veterinary Anesthesia

A cat is recovering from anesthesia and shows delayed return to consciousness with prolonged ataxia. Which factor most likely contributes to this presentation?

  1. Low body temperature Correct answer.
  2. Respiratory alkalosis
  3. Increased cardiac output
  4. Elevated body temperature

Explanation

Hypothermia reduces hepatic metabolism and prolongs the effects of many anesthetic drugs, delaying recovery. Cats are especially prone to rapid heat loss during anesthesia.

Question 41Veterinary Anesthesia

Which analgesic adjunct is a nonsteroidal anti-inflammatory drug that reduces prostaglandin synthesis and is often used in multimodal perioperative protocols?

  1. Morphine
  2. Meloxicam Correct answer.
  3. Lidocaine
  4. Ketamine

Explanation

Meloxicam is an NSAID that inhibits cyclooxygenase and reduces prostaglandin production. It provides anti-inflammatory and analgesic effects complementary to opioids and local anesthetics.

Question 42Veterinary Anesthesia

Which finding suggests that an anesthetized patient is inadequately anesthetized during a surgical stimulus?

  1. Decreased heart rate
  2. Decreased palpebral reflex
  3. Decreased respiratory rate
  4. Increased blood pressure and heart rate Correct answer.

Explanation

A rise in heart rate and blood pressure during surgical stimulation is a classic sign of inadequate anesthetic depth. These autonomic responses indicate sympathetic activation from nociception.

Question 43Veterinary Anesthesia

Which fluid type is a crystalloid that distributes across the extracellular fluid compartment and is commonly used for maintenance and replacement?

  1. Packed red blood cells
  2. Hetastarch
  3. Fresh frozen plasma
  4. Lactated Ringer's solution Correct answer.

Explanation

Lactated Ringer's solution is a balanced isotonic crystalloid that distributes across the extracellular space. It is widely used for maintenance and replacement therapy.

Question 44Veterinary Anesthesia

Which monitoring parameter is most useful for detecting hypoventilation during anesthesia when a capnograph is available?

  1. Blood pressure
  2. Body temperature
  3. Pulse oximetry
  4. End-tidal carbon dioxide Correct answer.

Explanation

End-tidal carbon dioxide rises with hypoventilation because carbon dioxide removal falls. Capnography allows early detection and correction of inadequate ventilation.

Question 45Veterinary Anesthesia

A dog with a suspected intracranial mass requires anesthesia. Which strategy best minimizes increases in intracranial pressure?

  1. Allow mean arterial pressure to fall below 60 mmHg
  2. Maintain normocapnia and avoid jugular compression Correct answer.
  3. Permit hypercapnia to increase cerebral blood flow
  4. Place the head lower than the body

Explanation

Hypercapnia increases cerebral blood flow and raises intracranial pressure, so normocapnia is maintained. Avoiding jugular compression also prevents impaired cerebral venous drainage.

Question 46Veterinary Anesthesia

A patient is receiving a high dose of an inhalant and develops a widened pulse pressure with vasodilation. Which hemodynamic effect of volatile anesthetics best explains this?

  1. Dose-dependent vasodilation and decreased vascular resistance Correct answer.
  2. Increased systemic vascular resistance
  3. Increased circulating catecholamines
  4. Increased myocardial contractility

Explanation

Volatile anesthetics cause dose-dependent vasodilation and reduce systemic vascular resistance. This lowers diastolic pressure and can widen the pulse pressure.

Question 47Veterinary Anesthesia

Which mechanism explains why an anticholinergic such as glycopyrrolate is chosen over atropine in a patient where a prolonged effect is desired?

  1. Glycopyrrolate has a longer duration and does not cross the blood-brain barrier Correct answer.
  2. Glycopyrrolate increases vagal tone
  3. Glycopyrrolate causes marked central excitation
  4. Glycopyrrolate is rapidly metabolized by plasma esterases

Explanation

Glycopyrrolate is a quaternary anticholinergic with limited central penetration and a longer duration than atropine. This makes it useful when sustained control of bradycardia or secretions is desired.

Question 48Veterinary Anesthesia

A patient with a history of anaphylaxis to a neuromuscular blocking agent is scheduled for surgery. Which approach is most appropriate?

  1. Omit monitoring of neuromuscular function
  2. Premedicate with an antihistamine and use the same agent
  3. Select an alternative neuromuscular blocking agent after review Correct answer.
  4. Use the same agent at a reduced dose

Explanation

Anaphylaxis to one neuromuscular blocker indicates avoidance of that agent and selection of a chemically distinct alternative. Prior sensitization can produce severe reactions on re-exposure.

Question 49Veterinary Anesthesia

Which factor most strongly influences the alveolar concentration of an inhalant anesthetic during the first minutes of administration?

  1. Respiratory rate alone
  2. Body weight of the patient
  3. Hemoglobin concentration
  4. Blood-gas partition coefficient of the agent Correct answer.

Explanation

The blood-gas partition coefficient determines how readily the agent leaves alveolar gas for blood. A lower coefficient allows alveolar concentration to rise quickly toward the inspired concentration.

Question 50Veterinary Anesthesia

A critically ill patient requires anesthesia. Which combination of monitoring findings best indicates adequate tissue oxygen delivery?

  1. Normal blood pressure with normal lactate Correct answer.
  2. Normal blood pressure with rising lactate
  3. Low blood pressure with rising lactate
  4. Low blood pressure with normal lactate

Explanation

Adequate oxygen delivery is supported by stable hemodynamics and normal or falling lactate, which indicates aerobic metabolism. Rising lactate with hypotension suggests inadequate perfusion.