___________________________________________________________________
Certified Anesthesiologist Assistant
(CAA) Initial Certification Practice Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
___________________________________________________________________
1. Which nerve provides the primary motor innervation to the diaphragm?
A. Vagus nerve
B. Intercostal nerves
C. Phrenic nerve
D. Sympathetic chain
Answer: Phrenic nerve
Rationale: The phrenic nerve, arising primarily from C3–C5 spinal nerve roots,
provides the major motor supply to the diaphragm and is essential for
spontaneous ventilation.
2. Which cardiovascular variable is the primary determinant of myocardial
oxygen demand?
A. Systemic vascular resistance
B. Heart rate
,C. Central venous pressure
D. Hemoglobin concentration
Answer: Heart rate
Rationale: Increased heart rate substantially raises myocardial oxygen
consumption because the myocardium performs more work per unit of time and
has less diastolic coronary perfusion time.
3. Which induction agent is generally associated with the greatest
preservation of cardiovascular stability?
A. Propofol
B. Thiopental
C. Etomidate
D. Midazolam
Answer: Etomidate
Rationale: Etomidate produces relatively little myocardial depression and
sympathetic suppression compared with many other induction agents, making it
useful when cardiovascular stability is important.
4. A patient develops severe hypotension immediately after induction with
propofol. Which mechanism most likely contributes?
A. Increased systemic vascular resistance
B. Increased venous return
C. Reduced systemic vascular resistance and venodilation
D. Increased myocardial contractility
Answer: Reduced systemic vascular resistance and venodilation
Rationale: Propofol commonly decreases sympathetic vascular tone, causing
arterial and venous dilation, reduced preload, and reduced systemic vascular
resistance.
5. Which local anesthetic has the greatest potential for cardiotoxicity when
administered systemically?
,A. Lidocaine
B. Mepivacaine
C. Chloroprocaine
D. Bupivacaine
Answer: Bupivacaine
Rationale: Bupivacaine is highly lipid soluble and can produce significant
sodium-channel blockade in cardiac tissue, increasing the risk of serious
ventricular dysrhythmias and cardiovascular collapse after systemic toxicity.
6. What is the primary purpose of preoxygenation before induction of general
anesthesia?
A. Increase metabolic rate
B. Decrease functional residual capacity
C. Increase oxygen reserves and prolong safe apnea time
D. Prevent bronchospasm
Answer: Increase oxygen reserves and prolong safe apnea time
Rationale: Preoxygenation replaces alveolar nitrogen with oxygen, increasing
the oxygen reservoir in the lungs and delaying arterial desaturation during
apnea.
7. Which volatile anesthetic has the lowest blood-gas partition coefficient
among commonly used modern inhaled anesthetics?
A. Isoflurane
B. Sevoflurane
C. Desflurane
D. Desflurane
Answer: Desflurane
Rationale: Desflurane has very low blood solubility, allowing relatively rapid
changes in alveolar and brain anesthetic concentrations and therefore rapid
adjustment of anesthetic depth.
, 8. Which drug is a selective β1-adrenergic agonist commonly used to increase
cardiac contractility?
A. Phenylephrine
B. Norepinephrine
C. Dobutamine
D. Vasopressin
Answer: Dobutamine
Rationale: Dobutamine primarily stimulates β1 receptors, increasing myocardial
contractility and cardiac output, with additional modest β2 and α1 activity.
9. Which medication is a direct-acting α1-adrenergic agonist?
A. Ephedrine
B. Phenylephrine
C. Dobutamine
D. Albuterol
Answer: Phenylephrine
Rationale: Phenylephrine predominantly stimulates α1 receptors, producing
arterial vasoconstriction and increased systemic vascular resistance.
10.Which factor shifts the oxyhemoglobin dissociation curve to the right?
A. Hypothermia
B. Decreased 2,3-DPG
C. Alkalosis
D. Acidosis
Answer: Acidosis
Rationale: Acidosis decreases hemoglobin's affinity for oxygen, shifting the
oxyhemoglobin dissociation curve to the right and facilitating oxygen unloading
to tissues.
11.What is the normal approximate arterial partial pressure of oxygen at sea
level in a healthy adult breathing room air?
Certified Anesthesiologist Assistant
(CAA) Initial Certification Practice Exam
Questions And Correct Answers (Verified
Answers) Plus Rationales 2026 Q&A
Instant Download Pdf
___________________________________________________________________
1. Which nerve provides the primary motor innervation to the diaphragm?
A. Vagus nerve
B. Intercostal nerves
C. Phrenic nerve
D. Sympathetic chain
Answer: Phrenic nerve
Rationale: The phrenic nerve, arising primarily from C3–C5 spinal nerve roots,
provides the major motor supply to the diaphragm and is essential for
spontaneous ventilation.
2. Which cardiovascular variable is the primary determinant of myocardial
oxygen demand?
A. Systemic vascular resistance
B. Heart rate
,C. Central venous pressure
D. Hemoglobin concentration
Answer: Heart rate
Rationale: Increased heart rate substantially raises myocardial oxygen
consumption because the myocardium performs more work per unit of time and
has less diastolic coronary perfusion time.
3. Which induction agent is generally associated with the greatest
preservation of cardiovascular stability?
A. Propofol
B. Thiopental
C. Etomidate
D. Midazolam
Answer: Etomidate
Rationale: Etomidate produces relatively little myocardial depression and
sympathetic suppression compared with many other induction agents, making it
useful when cardiovascular stability is important.
4. A patient develops severe hypotension immediately after induction with
propofol. Which mechanism most likely contributes?
A. Increased systemic vascular resistance
B. Increased venous return
C. Reduced systemic vascular resistance and venodilation
D. Increased myocardial contractility
Answer: Reduced systemic vascular resistance and venodilation
Rationale: Propofol commonly decreases sympathetic vascular tone, causing
arterial and venous dilation, reduced preload, and reduced systemic vascular
resistance.
5. Which local anesthetic has the greatest potential for cardiotoxicity when
administered systemically?
,A. Lidocaine
B. Mepivacaine
C. Chloroprocaine
D. Bupivacaine
Answer: Bupivacaine
Rationale: Bupivacaine is highly lipid soluble and can produce significant
sodium-channel blockade in cardiac tissue, increasing the risk of serious
ventricular dysrhythmias and cardiovascular collapse after systemic toxicity.
6. What is the primary purpose of preoxygenation before induction of general
anesthesia?
A. Increase metabolic rate
B. Decrease functional residual capacity
C. Increase oxygen reserves and prolong safe apnea time
D. Prevent bronchospasm
Answer: Increase oxygen reserves and prolong safe apnea time
Rationale: Preoxygenation replaces alveolar nitrogen with oxygen, increasing
the oxygen reservoir in the lungs and delaying arterial desaturation during
apnea.
7. Which volatile anesthetic has the lowest blood-gas partition coefficient
among commonly used modern inhaled anesthetics?
A. Isoflurane
B. Sevoflurane
C. Desflurane
D. Desflurane
Answer: Desflurane
Rationale: Desflurane has very low blood solubility, allowing relatively rapid
changes in alveolar and brain anesthetic concentrations and therefore rapid
adjustment of anesthetic depth.
, 8. Which drug is a selective β1-adrenergic agonist commonly used to increase
cardiac contractility?
A. Phenylephrine
B. Norepinephrine
C. Dobutamine
D. Vasopressin
Answer: Dobutamine
Rationale: Dobutamine primarily stimulates β1 receptors, increasing myocardial
contractility and cardiac output, with additional modest β2 and α1 activity.
9. Which medication is a direct-acting α1-adrenergic agonist?
A. Ephedrine
B. Phenylephrine
C. Dobutamine
D. Albuterol
Answer: Phenylephrine
Rationale: Phenylephrine predominantly stimulates α1 receptors, producing
arterial vasoconstriction and increased systemic vascular resistance.
10.Which factor shifts the oxyhemoglobin dissociation curve to the right?
A. Hypothermia
B. Decreased 2,3-DPG
C. Alkalosis
D. Acidosis
Answer: Acidosis
Rationale: Acidosis decreases hemoglobin's affinity for oxygen, shifting the
oxyhemoglobin dissociation curve to the right and facilitating oxygen unloading
to tissues.
11.What is the normal approximate arterial partial pressure of oxygen at sea
level in a healthy adult breathing room air?
