VSIM Christopher Parrish – Cystic Fibrosis Mastery
Assessment Actual Exam 2026/2027 – Complete
Questions and Answers with Detailed Rationales –
Pass Guaranteed – A+ Graded
Section 1: Cystic Fibrosis Pathophysiology & Clinical Presentation
Q1: Cystic fibrosis is caused by mutations in the CFTR gene. What is the inheritance
pattern of this condition?
A. Autosomal dominant
B. Autosomal recessive [CORRECT]
C. X-linked recessive
D. Mitochondrial inheritance
Correct Answer: B
Rationale: The best answer is B because cystic fibrosis follows an autosomal recessive
pattern, meaning a child must inherit two mutated copies of the CFTR gene—one from
each parent—to develop the disease. This is fundamental knowledge for counseling
families about recurrence risks.
Q2: The sweat chloride test is a key diagnostic tool for cystic fibrosis. What chloride
level is considered diagnostic?
A. Greater than 30 mmol/L
B. Greater than 40 mmol/L
C. Greater than 60 mmol/L [CORRECT]
D. Greater than 100 mmol/L
Correct Answer: C
,Rationale: This choice is correct because a sweat chloride concentration greater than
60 mmol/L on two separate tests is considered diagnostic for cystic fibrosis, while
levels between 30 and 60 are intermediate and require further genetic testing.
Q3: In cystic fibrosis, the defective CFTR protein primarily affects which basic
physiologic function?
A. Insulin production in the pancreas
B. Chloride and water transport across epithelial cell membranes [CORRECT]
C. Hemoglobin oxygen binding in the lungs
D. Bile acid synthesis in the liver
Correct Answer: B
Rationale: The best answer is B because the CFTR protein normally regulates chloride
and water movement across cell membranes, and when it malfunctions, the resulting
thick, dehydrated mucus plugs up airways and ducts throughout the body.
Q4: Christopher Parrish is an 8-year-old who presents with frequent bulky, foul-smelling
stools that are difficult to flush. His mother notes he seems hungry all the time but is
not gaining weight. Which pathophysiologic process best explains these findings?
A. Excessive bile acid production
B. Pancreatic insufficiency causing malabsorption of fats and nutrients [CORRECT]
C. Intestinal hypermotility speeding transit time
D. Excessive mucus production blocking the colon
Correct Answer: B
Rationale: This choice is correct because thick secretions block pancreatic ducts,
preventing digestive enzymes from reaching the intestines, so fats and nutrients pass
through unabsorbed, causing steatorrhea and failure to thrive despite a good appetite.
Q5: A child with CF develops chronic cough and wheezing that does not respond to
typical asthma therapy. What is the underlying cause of these respiratory symptoms?
A. Bronchial smooth muscle hyperreactivity alone
B. Thick, tenacious mucus obstructing airways and impairing mucociliary clearance
[CORRECT]
C. Alveolar collapse due to surfactant deficiency
D. Pulmonary vascular congestion from left heart failure
Correct Answer: B
, Rationale: The best answer is B because in CF, abnormally thick mucus clogs the
airways and paralyzes the cilia that normally sweep debris out, leading to chronic cough,
wheezing, and a perfect breeding ground for bacteria.
Q6: A newborn fails to pass meconium within the first 48 hours of life and develops
abdominal distension and vomiting. A barium enema shows a microcolon with an
obstruction in the distal ileum. Which diagnosis should the nurse suspect?
A. Hirschsprung disease
B. Cystic fibrosis with meconium ileus [CORRECT]
C. Intussusception
D. Necrotizing enterocolitis
Correct Answer: B
Rationale: This choice is correct because meconium ileus—thick, inspissated meconium
blocking the distal ileum—is often the earliest manifestation of cystic fibrosis in
newborns, and any infant presenting with this picture should be evaluated for CF.
Q7: Christopher has had three pulmonary exacerbations in the past year, each requiring
antibiotics. His sputum cultures frequently grow Pseudomonas aeruginosa. Why are
patients with CF particularly susceptible to recurrent respiratory infections?
A. They have deficient immunoglobulin production
B. Thick mucus traps bacteria and impairs normal airway defenses [CORRECT]
C. They lack cilia entirely in the respiratory tract
D. They have an allergic response to common bacteria
Correct Answer: B
Rationale: The best answer is B because the stagnant mucus in CF airways acts like a
bacterial trap while simultaneously preventing the normal mucociliary escalator from
clearing pathogens, making chronic colonization and recurrent infection almost
inevitable.
Q8: Despite eating three full meals plus snacks daily, Christopher has fallen from the
50th percentile to the 10th percentile for weight over the past six months. Which factor
is most responsible for this failure to thrive?
A. Increased metabolic rate from chronic infection
B. Malabsorption due to lack of pancreatic enzymes [CORRECT]
C. Decreased appetite from medication side effects
Assessment Actual Exam 2026/2027 – Complete
Questions and Answers with Detailed Rationales –
Pass Guaranteed – A+ Graded
Section 1: Cystic Fibrosis Pathophysiology & Clinical Presentation
Q1: Cystic fibrosis is caused by mutations in the CFTR gene. What is the inheritance
pattern of this condition?
A. Autosomal dominant
B. Autosomal recessive [CORRECT]
C. X-linked recessive
D. Mitochondrial inheritance
Correct Answer: B
Rationale: The best answer is B because cystic fibrosis follows an autosomal recessive
pattern, meaning a child must inherit two mutated copies of the CFTR gene—one from
each parent—to develop the disease. This is fundamental knowledge for counseling
families about recurrence risks.
Q2: The sweat chloride test is a key diagnostic tool for cystic fibrosis. What chloride
level is considered diagnostic?
A. Greater than 30 mmol/L
B. Greater than 40 mmol/L
C. Greater than 60 mmol/L [CORRECT]
D. Greater than 100 mmol/L
Correct Answer: C
,Rationale: This choice is correct because a sweat chloride concentration greater than
60 mmol/L on two separate tests is considered diagnostic for cystic fibrosis, while
levels between 30 and 60 are intermediate and require further genetic testing.
Q3: In cystic fibrosis, the defective CFTR protein primarily affects which basic
physiologic function?
A. Insulin production in the pancreas
B. Chloride and water transport across epithelial cell membranes [CORRECT]
C. Hemoglobin oxygen binding in the lungs
D. Bile acid synthesis in the liver
Correct Answer: B
Rationale: The best answer is B because the CFTR protein normally regulates chloride
and water movement across cell membranes, and when it malfunctions, the resulting
thick, dehydrated mucus plugs up airways and ducts throughout the body.
Q4: Christopher Parrish is an 8-year-old who presents with frequent bulky, foul-smelling
stools that are difficult to flush. His mother notes he seems hungry all the time but is
not gaining weight. Which pathophysiologic process best explains these findings?
A. Excessive bile acid production
B. Pancreatic insufficiency causing malabsorption of fats and nutrients [CORRECT]
C. Intestinal hypermotility speeding transit time
D. Excessive mucus production blocking the colon
Correct Answer: B
Rationale: This choice is correct because thick secretions block pancreatic ducts,
preventing digestive enzymes from reaching the intestines, so fats and nutrients pass
through unabsorbed, causing steatorrhea and failure to thrive despite a good appetite.
Q5: A child with CF develops chronic cough and wheezing that does not respond to
typical asthma therapy. What is the underlying cause of these respiratory symptoms?
A. Bronchial smooth muscle hyperreactivity alone
B. Thick, tenacious mucus obstructing airways and impairing mucociliary clearance
[CORRECT]
C. Alveolar collapse due to surfactant deficiency
D. Pulmonary vascular congestion from left heart failure
Correct Answer: B
, Rationale: The best answer is B because in CF, abnormally thick mucus clogs the
airways and paralyzes the cilia that normally sweep debris out, leading to chronic cough,
wheezing, and a perfect breeding ground for bacteria.
Q6: A newborn fails to pass meconium within the first 48 hours of life and develops
abdominal distension and vomiting. A barium enema shows a microcolon with an
obstruction in the distal ileum. Which diagnosis should the nurse suspect?
A. Hirschsprung disease
B. Cystic fibrosis with meconium ileus [CORRECT]
C. Intussusception
D. Necrotizing enterocolitis
Correct Answer: B
Rationale: This choice is correct because meconium ileus—thick, inspissated meconium
blocking the distal ileum—is often the earliest manifestation of cystic fibrosis in
newborns, and any infant presenting with this picture should be evaluated for CF.
Q7: Christopher has had three pulmonary exacerbations in the past year, each requiring
antibiotics. His sputum cultures frequently grow Pseudomonas aeruginosa. Why are
patients with CF particularly susceptible to recurrent respiratory infections?
A. They have deficient immunoglobulin production
B. Thick mucus traps bacteria and impairs normal airway defenses [CORRECT]
C. They lack cilia entirely in the respiratory tract
D. They have an allergic response to common bacteria
Correct Answer: B
Rationale: The best answer is B because the stagnant mucus in CF airways acts like a
bacterial trap while simultaneously preventing the normal mucociliary escalator from
clearing pathogens, making chronic colonization and recurrent infection almost
inevitable.
Q8: Despite eating three full meals plus snacks daily, Christopher has fallen from the
50th percentile to the 10th percentile for weight over the past six months. Which factor
is most responsible for this failure to thrive?
A. Increased metabolic rate from chronic infection
B. Malabsorption due to lack of pancreatic enzymes [CORRECT]
C. Decreased appetite from medication side effects
