CRNA Interview Questions & Answers
A free sample of CRNA (nurse anesthesia) interview questions with answers and full rationales, grouped by topic. The complete 93-question bank — every topic, every answer — is part of The Inside Track, alongside a free question of the day.
Pharmacology CRNA interview questions
A hypotensive, hypovolemic ICU patient is about to be induced with propofol. Which mechanism best explains why this drug can cause profound hypotension in this patient?
- Selective coronary vasoconstriction reducing myocardial oxygen supply
- Antagonism of GABA-A receptors leading to neuronal excitation
- Direct alpha-1 adrenergic agonism that raises systemic vascular resistance
- Massive histamine release causing bronchospasm and flushing
- Dose-dependent vasodilation and reduced preload with a blunted baroreceptor reflex
Why: Propofol potentiates GABA-A receptor activity and causes dose-dependent decreases in SVR (vasodilation) plus some direct myocardial depression, while also blunting the compensatory baroreflex tachycardia. In a hypovolemic patient this combination produces profound hypotension. It does not raise SVR, it agonizes (not antagonizes) GABA-A, and histamine release and coronary vasoconstriction are not its characteristic effects.
Etomidate is often chosen for induction in a hemodynamically unstable patient. What is the major concern with even a single induction dose?
- Malignant hyperthermia in susceptible patients
- Profound vasodilation and reflex tachycardia
- Sustained increase in intracranial pressure
- Prolonged neuromuscular blockade and apnea
- Adrenocortical suppression from inhibition of 11-beta-hydroxylase
Why: Etomidate is a GABA-A agonist prized for cardiovascular stability, but it inhibits 11-beta-hydroxylase (CYP11B1), blocking cortisol synthesis, so even a single dose can transiently suppress adrenocortical function for roughly 24 hours. It does not cause vasodilation/reflex tachycardia (it preserves blood pressure), is not a malignant hyperthermia trigger, has no neuromuscular blocking activity, and tends to lower rather than raise ICP.
Acid-Base & Renal CRNA interview questions
When interpreting an arterial blood gas using a systematic framework, which value should you evaluate FIRST to name the primary problem?
- The anion gap, to screen for unmeasured acids
- PaCO2, to assess the respiratory component
- The pH, to determine acidemia versus alkalemia
- HCO3, to assess the metabolic component
- The PaO2, to assess oxygenation status
Why: The first step is the pH: acidemia (<7.35) or alkalemia (>7.45) names the primary derangement. You then inspect PaCO2 and HCO3 to find which one matches the pH direction (the primary driver) and assess compensation, and you calculate the anion gap on any metabolic acidosis. PaCO2, HCO3, anion gap, and PaO2 are all later steps that are interpreted relative to the pH.
Which set of changes correctly describes a primary respiratory acidosis?
- High pH, high HCO3, with compensatory hypoventilation
- Low pH, low HCO3, with compensatory hyperventilation
- Low pH, high PaCO2, with compensatory hyperventilation
- High pH, low PaCO2, with renal excretion of HCO3
- Low pH, high PaCO2, with renal retention of HCO3
Why: Respiratory acidosis is hypoventilation/CO2 retention: low pH and high PaCO2, with the kidney compensating by retaining HCO3. Option 1 describes respiratory alkalosis, option 2 describes metabolic acidosis, and option 3 describes metabolic alkalosis. Option 5 is wrong because hyperventilation would lower (not be the compensation for) a high PaCO2.
Cardiovascular CRNA interview questions
According to the Frank-Starling mechanism, what is the immediate effect of an increase in venous return (preload) on a normal ventricle operating on the steep part of its curve?
- Afterload increases, reducing the ejection fraction
- Stroke volume falls because the myocardium is overstretched
- Increased end-diastolic stretch raises the force of contraction and stroke volume
- Heart rate rises while stroke volume stays constant
- Contractility decreases due to reduced calcium sensitivity
Why: Within physiologic limits, increased preload stretches the myocardium, optimizing actin-myosin overlap and myofilament calcium sensitivity, which raises the force of contraction and stroke volume. This lets the heart match output to venous return beat-to-beat. Stroke volume only falls with overstretch past the optimal point, and the mechanism is intrinsic to stretch, not a rate change, decreased contractility, or an afterload effect.
A patient's blood pressure is falling and you find a low cardiac output with a high systemic vascular resistance. Which category of shock does this pattern most suggest?
- Neurogenic shock
- Anaphylactic shock
- Distributive (e.g., septic) shock
- Hypovolemic or cardiogenic shock
- Early hyperdynamic sepsis
Why: Since MAP is approximately cardiac output multiplied by systemic vascular resistance, a low CO with compensatory high SVR points toward hypovolemic or cardiogenic causes, where the primary problem is inadequate output and the vasculature constricts to defend pressure. Distributive states (septic, anaphylactic, neurogenic) and early hyperdynamic sepsis are characterized instead by LOW SVR, often with normal or high cardiac output. The pattern of CO and SVR directs therapy toward fluids/inotropes rather than vasopressors.
Respiratory CRNA interview questions
A rightward shift of the oxyhemoglobin dissociation curve indicates which change, and which factor causes it?
- Unchanged affinity caused by fetal hemoglobin
- Increased O2 affinity caused by low 2,3-DPG
- Decreased O2 affinity caused by carbon monoxide
- Decreased O2 affinity caused by acidosis (low pH)
- Increased O2 affinity caused by hypothermia
Why: A right shift means decreased hemoglobin affinity for O2 (higher P50), so hemoglobin unloads O2 more readily at the tissues; it is caused by increased CO2, increased H+/acidosis (Bohr effect), increased temperature, and increased 2,3-DPG. Hypothermia, low 2,3-DPG, carbon monoxide, and fetal hemoglobin all cause a LEFT shift (increased affinity).
A septic, febrile, acidotic patient has a rightward-shifted oxyhemoglobin curve. At the tissue level, is this shift helpful or harmful, and why?
- Helpful, because it raises the oxygen-carrying capacity of the blood
- Helpful, because it promotes O2 unloading to hypoxic, metabolically active tissue
- Harmful, because it increases hemoglobin's affinity for O2 at the tissues
- Harmful, because it prevents hemoglobin from binding O2 in the lungs entirely
- Neutral, because curve shifts have no effect on tissue oxygen delivery
Why: Fever, acidosis, and elevated CO2 shift the curve right (Bohr effect), lowering hemoglobin's O2 affinity, which is adaptive because it promotes O2 unloading to hypoxic, metabolically active tissue. The tradeoff is only slightly impaired loading on the flat upper part of the curve, not a complete block; a right shift decreases (not increases) tissue affinity, does not change carrying capacity, and is not neutral.
Neuro CRNA interview questions
Based on the Monro-Kellie doctrine, why can a brain bleed cause intracranial pressure to rise abruptly and dangerously after an initial stable period?
- Cerebrospinal fluid production stops, lowering total intracranial volume
- Brain tissue is compressible and absorbs unlimited added volume
- The skull expands to accommodate the added volume until it suddenly ruptures
- Once CSF and venous blood buffers are exhausted, small added volume causes a steep nonlinear ICP rise
- Arterial blood is continuously squeezed out, keeping ICP low indefinitely
Why: The skull is a fixed rigid box containing brain, CSF, and blood; early compensation displaces CSF into the spinal canal and pushes out venous blood so ICP stays near-normal at first. Once those buffers are exhausted, the pressure-volume curve becomes steep, so small additional volume causes a sharp ICP rise. The skull does not expand, brain tissue is not infinitely compressible, and CSF production does not simply halt.
Which equation correctly defines cerebral perfusion pressure (CPP)?
- CPP = ICP - MAP
- CPP = MAP + ICP
- CPP = cardiac output x SVR
- CPP = MAP - CVP
- CPP = MAP - ICP
Why: CPP = MAP - ICP represents the net pressure driving blood flow to the brain, so CPP falls if MAP drops or if ICP rises; a common target is roughly 60-80 mmHg. Adding ICP or reversing the subtraction is incorrect, MAP - CVP describes systemic perfusion pressure rather than cerebral, and CO x SVR estimates MAP, not CPP.
Endocrine CRNA interview questions
In diabetic ketoacidosis, which mechanism directly produces the high anion-gap metabolic acidosis?
- Retention of CO2 from compensatory hypoventilation
- Renal failure causing accumulation of phosphate and sulfate
- Lactic acid buildup from insulin-driven glucose uptake
- Loss of bicarbonate through osmotic diuresis in the urine
- Hepatic conversion of free fatty acids into ketoacids that accumulate in the blood
Why: Insulin deficiency unleashes lipolysis; the liver converts the resulting free fatty acids into ketone bodies (acetoacetate and beta-hydroxybutyrate), and these accumulating ketoacids produce the high anion-gap acidosis, classically with compensatory Kussmaul breathing. The acidosis is not from bicarbonate loss, CO2 retention (the lungs hyperventilate), insulin-driven glucose uptake, or renal failure.
In DKA the initial serum potassium is often normal or high, yet dangerous hypokalemia can develop with treatment. Which statement best explains this paradox?
- Potassium is sequestered in red cells and released by rehydration
- Total-body potassium is depleted, but acidosis and insulin deficiency shift K+ out of cells, masking the deficit until insulin drives it back in
- The kidneys retain potassium until insulin triggers renal excretion
- Total-body potassium is elevated, and insulin worsens the overload
- Serum potassium is falsely low at presentation due to hemodilution
Why: Total-body potassium is actually depleted from osmotic diuresis and urinary losses, but serum K+ looks normal or high initially because acidosis and insulin deficiency shift K+ out of cells. Insulin therapy and correction of acidosis drive K+ back into cells, so serum K+ can fall sharply, which is why insulin is held if K+ is very low. Total-body potassium is depleted (not elevated), and the deficit is intracellular shift, not RBC sequestration, renal retention, or hemodilution.
Hematology CRNA interview questions
In the coagulation cascade, the intrinsic and extrinsic pathways converge at which point to form the common pathway?
- The cross-linking of fibrin by factor XIII
- The conversion of fibrinogen to fibrin
- The contact activation of factor XII
- The activation of factor X to factor Xa
- The release of tissue factor from damaged endothelium
Why: The extrinsic (tissue factor) and intrinsic (contact activation) pathways both converge on the common pathway at the activation of factor X to factor Xa; Xa with cofactor Va, calcium, and phospholipid then converts prothrombin to thrombin, which converts fibrinogen to fibrin. Fibrinogen-to-fibrin conversion and factor XIII cross-linking are downstream, tissue factor release initiates only the extrinsic arm, and factor XII initiates only the intrinsic arm.
Minutes into a red cell transfusion, a patient develops fever, flank pain, dark urine, and hypotension. What is the underlying mechanism?
- IgE-mediated mast cell degranulation against donor plasma proteins
- Volume overload from rapid infusion raising pulmonary pressures
- Preformed recipient anti-A/anti-B antibodies activating complement and causing intravascular hemolysis
- Cytokines accumulated during storage causing fever without hemolysis
- Donor anti-leukocyte antibodies activating recipient neutrophils in the lung
Why: This is an acute hemolytic transfusion reaction, most often from ABO incompatibility (commonly a clerical error). Preformed recipient IgM anti-A/anti-B antibodies bind donor red cells and activate complement, causing intravascular hemolysis with free hemoglobin (dark urine), fever, and hypotension. Donor anti-leukocyte antibodies describe TRALI, stored cytokines describe a febrile non-hemolytic reaction, IgE degranulation describes an allergic/anaphylactic reaction, and rapid volume describes TACO.
Sepsis & Shock CRNA interview questions
Under the Sepsis-3 definitions, how is sepsis defined?
- Two or more SIRS criteria in a patient with a suspected infection
- Life-threatening organ dysfunction caused by a dysregulated host response to infection
- A positive blood culture with an elevated procalcitonin
- Hypotension requiring vasopressors regardless of lactate level
- Any documented infection accompanied by fever and leukocytosis
Why: Sepsis-3 defines sepsis as life-threatening organ dysfunction caused by a dysregulated host response to infection, operationalized as an acute rise of 2 or more SOFA points; it de-emphasized SIRS criteria and eliminated 'severe sepsis.' SIRS criteria, fever with leukocytosis, vasopressor need (which defines septic shock, not sepsis), and a positive culture with procalcitonin are not the Sepsis-3 definition.
In septic shock, which mechanism is the primary cause of the drop in blood pressure?
- Widespread vasodilation that lowers systemic vascular resistance (distributive shock)
- Mechanical obstruction of venous return by tamponade
- Increased systemic vascular resistance from intense vasoconstriction
- Loss of intravascular volume from frank hemorrhage
- Acute pump failure from direct myocardial infarction
Why: Infection triggers a dysregulated immune response with mediators such as cytokines and nitric oxide that cause widespread vasodilation, dropping SVR and producing distributive (vasodilatory) hypotension; increased capillary permeability and microvascular/mitochondrial dysfunction then keep tissues hypoxic despite possibly high cardiac output. The hypotension is from low (not high) SVR, and the primary problem is distributive, not cardiogenic, hemorrhagic, or obstructive.
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Educational practice only — not medical advice or official interview material. Written and fact-checked against standard anesthesia and critical-care references. Last updated 2026.
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