NR 412 Exam 3: Pathophysiology V1 Updated and Latest
Questions and Correct Answers - Regis University
1. A patient presents with dyspnea and a cough productive of thick, tenacious mucus. Which
condition is most likely characterized by permanent enlargement of the air spaces distal to
the terminal bronchioles?
A. Chronic Bronchitis
B. Pneumonia
C. Asthma
D. Emphysema
Correct Answer: D
Explanation: Emphysema is a chronic lung disease involving the destruction of alveolar walls. This
destruction leads to permanently enlarged air spaces in the lungs. The primary mechanism is an
imbalance between proteases and antiproteases. This causes a loss of elastic recoil in the lung tissue.
Patients often experience air trapping and lung hyperinflation. Clinical signs typically include a barrel-
shaped chest and pursed-lip breathing. Unlike bronchitis, it focuses on structural damage rather than just
airway inflammation. Smoking is the most common risk factor associated with this pathology. Gas
exchange efficiency decreases significantly as the surface area for diffusion is lost. Understanding this
structural change is key for respiratory nursing care.
2. Which pathophysiological mechanism is responsible for the development of pulmonary
edema in a patient with left-sided heart failure?
A. Increased capillary oncotic pressure
B. Decreased capillary hydrostatic pressure
C. Increased capillary hydrostatic pressure
D. Obstruction of lymphatic drainage
Correct Answer: C
Explanation: Pulmonary edema in heart failure is driven by fluid dynamics. Left-sided heart failure
causes blood to back up into the pulmonary circulation. This backup increases the hydrostatic pressure
within the pulmonary capillaries. When hydrostatic pressure exceeds oncotic pressure, fluid is pushed
into the alveoli. This accumulation of fluid impairs the diffusion of oxygen and carbon dioxide. Patients
typically present with crackles upon auscultation of the lungs. Shortness of breath and orthopnea are
common clinical manifestations observed. The condition requires urgent intervention to reduce fluid
volume and pressure. It differs from non-cardiogenic edema which involves increased membrane
permeability. Effective management focuses on improving cardiac output and decreasing pulmonary
congestion.
,3. A patient with a history of deep vein thrombosis suddenly develops pleuritic chest pain
and shortness of breath. What is the most likely pathophysiological event?
A. Myocardial Infarction
B. Pleurisy
C. Pneumothorax
D. Pulmonary Embolism
Correct Answer: D
Explanation: A pulmonary embolism occurs when a thrombus dislodges and travels to the lungs. It most
commonly originates from deep veins in the lower extremities. The embolus obstructs blood flow
through the pulmonary arterial system. This creates an area of the lung that is ventilated but not
perfused. This ventilation-perfusion mismatch leads to acute hypoxemia and respiratory distress.
Pleuritic chest pain results from inflammation of the lung pleura. Virchow’s triad describes the risk
factors for such thrombotic events. These factors include stasis of blood, vessel wall injury, and
hypercoagulability. Immediate anticoagulation is often necessary to prevent further clot formation.
Nurses must recognize these acute symptoms to facilitate rapid life-saving treatment.
4. During an asthma attack, what is the primary cause of airway obstruction?
A. Destruction of the alveolar septum
B. Bronchoconstriction and mucosal edema
C. Permanent dilation of the bronchi
D. Alveolar collapse due to lack of surfactant
Correct Answer: B
Explanation: Asthma is a chronic inflammatory disorder of the bronchial airways. It is characterized by
hyper-responsiveness to various environmental triggers. During an attack, the smooth muscles around
the bronchi constrict sharply. Simultaneously, there is significant edema within the mucosal lining. This
combination leads to a narrowing of the airway lumen. Excessive mucus production further exacerbates
the blockage of airflow. The inflammation is typically mediated by IgE and mast cell degranulation.
Patients often exhibit wheezing and a prolonged expiratory phase. Symptoms are usually reversible with
the use of bronchodilators. Long-term management focuses on reducing underlying airway inflammation
through steroids.
, 5. Which of the following describes the pathophysiology of Acute Respiratory Distress
Syndrome (ARDS)?
A. Chronic inflammation leading to fibrosis
B. Loss of surfactant leading to localized collapse
C. Increased capillary permeability and alveolar flooding
D. Infection by Mycobacterium tuberculosis
Correct Answer: C
Explanation: ARDS is a severe form of acute respiratory failure. It is triggered by a systemic
inflammatory response to injury. The hallmark of ARDS is massive damage to the alveolar-capillary
membrane. This damage results in significantly increased capillary permeability. Fluid, proteins, and
blood cells leak into the alveolar spaces. This flooding leads to severe pulmonary edema and impaired gas
exchange. Surfactant production is also inhibited, leading to widespread atelectasis. The condition is
characterized by refractory hypoxemia despite high oxygen levels. It progresses through exudative,
proliferative, and fibrotic phases over time. Critical care management is required to support oxygenation
and ventilation.
6. What is the underlying cause of type 1 diabetes mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive glucagon secretion by alpha cells
C. Immune-mediated destruction of pancreatic beta cells
D. Chronic overconsumption of dietary glucose
Correct Answer: C
Explanation: Type 1 diabetes is primarily an autoimmune disease. The body’s immune system attacks
and destroys the beta cells. These cells are located in the islets of Langerhans in the pancreas. Because
beta cells produce insulin, their destruction leads to total insulin deficiency. This process is often
triggered by a combination of genetics and environment. T-cells are the main mediators of this cellular
destruction. Without insulin, glucose cannot enter cells for energy production. This leads to
hyperglycemia and the breakdown of fats for fuel. The resulting ketone production can lead to diabetic
ketoacidosis. Life-long exogenous insulin therapy is required for survival for these patients.
Questions and Correct Answers - Regis University
1. A patient presents with dyspnea and a cough productive of thick, tenacious mucus. Which
condition is most likely characterized by permanent enlargement of the air spaces distal to
the terminal bronchioles?
A. Chronic Bronchitis
B. Pneumonia
C. Asthma
D. Emphysema
Correct Answer: D
Explanation: Emphysema is a chronic lung disease involving the destruction of alveolar walls. This
destruction leads to permanently enlarged air spaces in the lungs. The primary mechanism is an
imbalance between proteases and antiproteases. This causes a loss of elastic recoil in the lung tissue.
Patients often experience air trapping and lung hyperinflation. Clinical signs typically include a barrel-
shaped chest and pursed-lip breathing. Unlike bronchitis, it focuses on structural damage rather than just
airway inflammation. Smoking is the most common risk factor associated with this pathology. Gas
exchange efficiency decreases significantly as the surface area for diffusion is lost. Understanding this
structural change is key for respiratory nursing care.
2. Which pathophysiological mechanism is responsible for the development of pulmonary
edema in a patient with left-sided heart failure?
A. Increased capillary oncotic pressure
B. Decreased capillary hydrostatic pressure
C. Increased capillary hydrostatic pressure
D. Obstruction of lymphatic drainage
Correct Answer: C
Explanation: Pulmonary edema in heart failure is driven by fluid dynamics. Left-sided heart failure
causes blood to back up into the pulmonary circulation. This backup increases the hydrostatic pressure
within the pulmonary capillaries. When hydrostatic pressure exceeds oncotic pressure, fluid is pushed
into the alveoli. This accumulation of fluid impairs the diffusion of oxygen and carbon dioxide. Patients
typically present with crackles upon auscultation of the lungs. Shortness of breath and orthopnea are
common clinical manifestations observed. The condition requires urgent intervention to reduce fluid
volume and pressure. It differs from non-cardiogenic edema which involves increased membrane
permeability. Effective management focuses on improving cardiac output and decreasing pulmonary
congestion.
,3. A patient with a history of deep vein thrombosis suddenly develops pleuritic chest pain
and shortness of breath. What is the most likely pathophysiological event?
A. Myocardial Infarction
B. Pleurisy
C. Pneumothorax
D. Pulmonary Embolism
Correct Answer: D
Explanation: A pulmonary embolism occurs when a thrombus dislodges and travels to the lungs. It most
commonly originates from deep veins in the lower extremities. The embolus obstructs blood flow
through the pulmonary arterial system. This creates an area of the lung that is ventilated but not
perfused. This ventilation-perfusion mismatch leads to acute hypoxemia and respiratory distress.
Pleuritic chest pain results from inflammation of the lung pleura. Virchow’s triad describes the risk
factors for such thrombotic events. These factors include stasis of blood, vessel wall injury, and
hypercoagulability. Immediate anticoagulation is often necessary to prevent further clot formation.
Nurses must recognize these acute symptoms to facilitate rapid life-saving treatment.
4. During an asthma attack, what is the primary cause of airway obstruction?
A. Destruction of the alveolar septum
B. Bronchoconstriction and mucosal edema
C. Permanent dilation of the bronchi
D. Alveolar collapse due to lack of surfactant
Correct Answer: B
Explanation: Asthma is a chronic inflammatory disorder of the bronchial airways. It is characterized by
hyper-responsiveness to various environmental triggers. During an attack, the smooth muscles around
the bronchi constrict sharply. Simultaneously, there is significant edema within the mucosal lining. This
combination leads to a narrowing of the airway lumen. Excessive mucus production further exacerbates
the blockage of airflow. The inflammation is typically mediated by IgE and mast cell degranulation.
Patients often exhibit wheezing and a prolonged expiratory phase. Symptoms are usually reversible with
the use of bronchodilators. Long-term management focuses on reducing underlying airway inflammation
through steroids.
, 5. Which of the following describes the pathophysiology of Acute Respiratory Distress
Syndrome (ARDS)?
A. Chronic inflammation leading to fibrosis
B. Loss of surfactant leading to localized collapse
C. Increased capillary permeability and alveolar flooding
D. Infection by Mycobacterium tuberculosis
Correct Answer: C
Explanation: ARDS is a severe form of acute respiratory failure. It is triggered by a systemic
inflammatory response to injury. The hallmark of ARDS is massive damage to the alveolar-capillary
membrane. This damage results in significantly increased capillary permeability. Fluid, proteins, and
blood cells leak into the alveolar spaces. This flooding leads to severe pulmonary edema and impaired gas
exchange. Surfactant production is also inhibited, leading to widespread atelectasis. The condition is
characterized by refractory hypoxemia despite high oxygen levels. It progresses through exudative,
proliferative, and fibrotic phases over time. Critical care management is required to support oxygenation
and ventilation.
6. What is the underlying cause of type 1 diabetes mellitus?
A. Insulin resistance in peripheral tissues
B. Excessive glucagon secretion by alpha cells
C. Immune-mediated destruction of pancreatic beta cells
D. Chronic overconsumption of dietary glucose
Correct Answer: C
Explanation: Type 1 diabetes is primarily an autoimmune disease. The body’s immune system attacks
and destroys the beta cells. These cells are located in the islets of Langerhans in the pancreas. Because
beta cells produce insulin, their destruction leads to total insulin deficiency. This process is often
triggered by a combination of genetics and environment. T-cells are the main mediators of this cellular
destruction. Without insulin, glucose cannot enter cells for energy production. This leads to
hyperglycemia and the breakdown of fats for fuel. The resulting ketone production can lead to diabetic
ketoacidosis. Life-long exogenous insulin therapy is required for survival for these patients.
