Ultimate Nursing Exam Prep:
Comprehensive MCQs with Verified
Answers & In-Depth Clinical
Rationales
1. A 64-year-old patient with chronic obstructive pulmonary disease (COPD) is
admitted with exacerbation. The nurse notes the patient is experiencing severe
dyspnea, using accessory muscles to breathe, and has a respiratory rate of 28
breaths per minute. Oxygen saturation is 86% on room air. Which oxygen
delivery method should the nurse implement first?
A. Nasal cannula at 6 L/min
, B. Venturi mask at 28% to 31%
C. Non-rebreather mask at 15 L/min
D. Simple face mask at 8 L/min
ANSWER: B. Venturi mask at 28% to 31%
RATIONALE: Patients with chronic obstructive pulmonary disease (COPD)
rely on a hypoxic drive to stimulate breathing because high levels of carbon
dioxide are chronically retained in their system. Administering high
concentrations of oxygen via a non-rebreather or high-flow nasal cannula
can knock out this hypoxic drive, causing respiratory depression or arrest.
The Venturi mask provides a highly precise, controlled concentration of low-
flow oxygen, making it the safest initial intervention to elevate oxygen levels
gradually without suppressing the respiratory drive.
2. While assessing a patient who is 12 hours post-abdominal aortic aneurysm
(AAA) repair, the nurse notes a sudden drop in urine output to 15 mL over the
past hour, accompanied by a blood pressure reading of 94/56 mmHg. Which
complication should the nurse suspect immediately?
A. Acute myocardial infarction
B. Renal artery occlusion or graft thrombosis
C. Hypovolemic shock from internal bleeding
D. Normal postoperative fluid shifts
ANSWER: B. Renal artery occlusion or graft thrombosis
RATIONALE: During an abdominal aortic aneurysm (AAA) repair, the graft
is placed in close anatomical proximity to the renal arteries. A sudden, drastic
reduction in urine output (less than 30 mL/hour) combined with hypotension
highly suggests that the graft has thrombosed or clotted, or that renal artery
perfusion has been severely compromised by occlusion. While hypovolemia
can cause low output, the localized nature of the surgical site makes renal
, arterial compromise a specific, high-priority emergency that demands rapid
surgical re-evaluation.
3. A nurse is preparing to administer an intravenous bolus of regular insulin to a
patient in Diabetic Ketoacidosis (DKA). Before initiating the insulin infusion,
which laboratory value must the nurse verify is within a safe range?
A. Blood urea nitrogen (BUN)
B. Serum potassium
C. Sodium level
D. Serum bicarbonate
ANSWER: B. Serum potassium
RATIONALE: Insulin drives both glucose and potassium out of the
extracellular fluid and back into the intracellular space. In diabetic
ketoacidosis (DKA), patients are severely depleted of total body potassium,
even if the initial serum reading looks normal. If insulin is administered when
the serum potassium is low (under 3.3 mEq/L), it can induce life-threatening
cardiac arrhythmias or cardiovascular collapse. Potassium must always be
corrected or verified as safe before insulin therapy begins.
4. A patient with a history of liver cirrhosis is admitted to the medical unit. The
nurse notes the patient is increasingly confused, disoriented to time and place,
and exhibits a flapping tremor of the hands when the arms are extended. Which
medication does the nurse expect the healthcare provider to prescribe?
A. Spironolactone
B. Lactulose
C. Rifaximin
D. Propropanol
ANSWER: B. Lactulose
RATIONALE: The patient is exhibiting classic signs of hepatic
encephalopathy, including confusion and asterixis (the flapping hand
, tremor), driven by an accumulation of neurotoxic ammonia in the
bloodstream. Lactulose works by acidifying the colon contents, converting
toxic ammonia (NH3) into ammonium (NH4+), which cannot be absorbed by
the gut wall and is instead excreted via osmotic stools. While rifaximin is an
adjunct antibiotic used for the same condition, lactulose remains the primary,
first-line standard of care for acute reductions in ammonia levels.
5. An infant diagnosed with Tetralogy of Fallot begins to cry intensely during a
blood draw, suddenly becoming deeply cyanotic with rapid, labored
respirations. Which action should the nurse take immediately?
A. Place the infant in a knee-chest position
B. Administer high-flow oxygen via a simple face mask
C. Prepare for emergency endotracheal intubation
D. Administer a dose of intravenous morphine sulfate
ANSWER: A. Place the infant in a knee-chest position
RATIONALE: The infant is experiencing a hypercyanotic spell, often called a
"Tet spell," caused by an acute spasm of the right ventricular outflow tract
that diverts deoxygenated blood away from the lungs and into systemic
circulation. Placing the infant in a knee-chest position instantly increases
systemic vascular resistance (SVR) in the lower extremities. This increased
resistance forces more blood out of the right ventricle into the pulmonary
artery and toward the lungs for oxygenation, stabilizing the infant faster than
any external drug or mask.
6. A nurse is caring for a patient who has just returned to the unit following a total
thyroidectomy. Which assessment finding represents a medical emergency that
requires immediate notification of the surgical team?
A. Sore throat and mild pain when swallowing
B. Incisional pain rated 6 out of 10 on a numeric scale
Comprehensive MCQs with Verified
Answers & In-Depth Clinical
Rationales
1. A 64-year-old patient with chronic obstructive pulmonary disease (COPD) is
admitted with exacerbation. The nurse notes the patient is experiencing severe
dyspnea, using accessory muscles to breathe, and has a respiratory rate of 28
breaths per minute. Oxygen saturation is 86% on room air. Which oxygen
delivery method should the nurse implement first?
A. Nasal cannula at 6 L/min
, B. Venturi mask at 28% to 31%
C. Non-rebreather mask at 15 L/min
D. Simple face mask at 8 L/min
ANSWER: B. Venturi mask at 28% to 31%
RATIONALE: Patients with chronic obstructive pulmonary disease (COPD)
rely on a hypoxic drive to stimulate breathing because high levels of carbon
dioxide are chronically retained in their system. Administering high
concentrations of oxygen via a non-rebreather or high-flow nasal cannula
can knock out this hypoxic drive, causing respiratory depression or arrest.
The Venturi mask provides a highly precise, controlled concentration of low-
flow oxygen, making it the safest initial intervention to elevate oxygen levels
gradually without suppressing the respiratory drive.
2. While assessing a patient who is 12 hours post-abdominal aortic aneurysm
(AAA) repair, the nurse notes a sudden drop in urine output to 15 mL over the
past hour, accompanied by a blood pressure reading of 94/56 mmHg. Which
complication should the nurse suspect immediately?
A. Acute myocardial infarction
B. Renal artery occlusion or graft thrombosis
C. Hypovolemic shock from internal bleeding
D. Normal postoperative fluid shifts
ANSWER: B. Renal artery occlusion or graft thrombosis
RATIONALE: During an abdominal aortic aneurysm (AAA) repair, the graft
is placed in close anatomical proximity to the renal arteries. A sudden, drastic
reduction in urine output (less than 30 mL/hour) combined with hypotension
highly suggests that the graft has thrombosed or clotted, or that renal artery
perfusion has been severely compromised by occlusion. While hypovolemia
can cause low output, the localized nature of the surgical site makes renal
, arterial compromise a specific, high-priority emergency that demands rapid
surgical re-evaluation.
3. A nurse is preparing to administer an intravenous bolus of regular insulin to a
patient in Diabetic Ketoacidosis (DKA). Before initiating the insulin infusion,
which laboratory value must the nurse verify is within a safe range?
A. Blood urea nitrogen (BUN)
B. Serum potassium
C. Sodium level
D. Serum bicarbonate
ANSWER: B. Serum potassium
RATIONALE: Insulin drives both glucose and potassium out of the
extracellular fluid and back into the intracellular space. In diabetic
ketoacidosis (DKA), patients are severely depleted of total body potassium,
even if the initial serum reading looks normal. If insulin is administered when
the serum potassium is low (under 3.3 mEq/L), it can induce life-threatening
cardiac arrhythmias or cardiovascular collapse. Potassium must always be
corrected or verified as safe before insulin therapy begins.
4. A patient with a history of liver cirrhosis is admitted to the medical unit. The
nurse notes the patient is increasingly confused, disoriented to time and place,
and exhibits a flapping tremor of the hands when the arms are extended. Which
medication does the nurse expect the healthcare provider to prescribe?
A. Spironolactone
B. Lactulose
C. Rifaximin
D. Propropanol
ANSWER: B. Lactulose
RATIONALE: The patient is exhibiting classic signs of hepatic
encephalopathy, including confusion and asterixis (the flapping hand
, tremor), driven by an accumulation of neurotoxic ammonia in the
bloodstream. Lactulose works by acidifying the colon contents, converting
toxic ammonia (NH3) into ammonium (NH4+), which cannot be absorbed by
the gut wall and is instead excreted via osmotic stools. While rifaximin is an
adjunct antibiotic used for the same condition, lactulose remains the primary,
first-line standard of care for acute reductions in ammonia levels.
5. An infant diagnosed with Tetralogy of Fallot begins to cry intensely during a
blood draw, suddenly becoming deeply cyanotic with rapid, labored
respirations. Which action should the nurse take immediately?
A. Place the infant in a knee-chest position
B. Administer high-flow oxygen via a simple face mask
C. Prepare for emergency endotracheal intubation
D. Administer a dose of intravenous morphine sulfate
ANSWER: A. Place the infant in a knee-chest position
RATIONALE: The infant is experiencing a hypercyanotic spell, often called a
"Tet spell," caused by an acute spasm of the right ventricular outflow tract
that diverts deoxygenated blood away from the lungs and into systemic
circulation. Placing the infant in a knee-chest position instantly increases
systemic vascular resistance (SVR) in the lower extremities. This increased
resistance forces more blood out of the right ventricle into the pulmonary
artery and toward the lungs for oxygenation, stabilizing the infant faster than
any external drug or mask.
6. A nurse is caring for a patient who has just returned to the unit following a total
thyroidectomy. Which assessment finding represents a medical emergency that
requires immediate notification of the surgical team?
A. Sore throat and mild pain when swallowing
B. Incisional pain rated 6 out of 10 on a numeric scale
