HSC 4558 Final Exam V1 | HSC 4558
Pathophysiology II | Actual Q&A with
Rationale (HSC4558 Final Exam) |
University of Central Florida
1. A patient presents with sudden onset of severe chest pain that radiates to the back and
describes it as a ‘tearing’ sensation. Which condition is most likely based on these clinical
manifestations?
A. Aortic dissection
B. Myocardial infarction
C. Pericarditis
D. Pneumothorax
Answer: A
Rationale: Aortic dissection is characterized by a longitudinal tear in the aortic wall,
allowing blood to enter the tunica media. The classic presentation is a sudden, sharp,
tearing or ripping pain that often radiates to the area between the shoulder blades. This is a
medical emergency that requires rapid intervention to prevent rupture and systemic
malperfusion.
2. Which mechanism best describes the development of pulmonary edema in a patient with
left-sided heart failure?
A. Increased pulmonary capillary hydrostatic pressure
,B. Decreased oncotic pressure in the pulmonary vasculature
C. Increased permeability of the alveolar-capillary membrane
D. Obstruction of the lymphatic drainage in the lungs
Answer: A
Rationale: In left-sided heart failure, the left ventricle is unable to pump blood effectively
into the systemic circulation, causing blood to back up into the pulmonary veins. This
backup leads to an increase in pulmonary capillary hydrostatic pressure, which forces fluid
out of the capillaries and into the lung tissue. This accumulation of fluid impairs gas
exchange and leads to the symptoms of dyspnea and crackles.
3. In the pathophysiology of Chronic Obstructive Pulmonary Disease (COPD), specifically
emphysema, what is the primary cause of airflow limitation?
A. Loss of elastic recoil and alveolar wall destruction
B. Excessive mucus production in the bronchioles
C. Acute reversible bronchoconstriction
D. Infection of the lower respiratory tract
Answer: A
Rationale: Emphysema involves the permanent enlargement of gas-exchange airways
accompanied by the destruction of alveolar walls without obvious fibrosis. The loss of
elastin results in a decrease in the elastic recoil of the lungs, which normally helps keep
,airways open during expiration. Consequently, the airways collapse during exhalation,
leading to air trapping and hyperinflation of the lungs.
4. A patient with chronic kidney disease (CKD) develops secondary hyperparathyroidism.
What is the initiating factor in this compensatory mechanism?
A. Excessive intake of dietary calcium
B. Direct stimulation of the parathyroid gland by urea
C. Hypocalcemia resulting from hyperphosphatemia and reduced Vitamin D activation
D. Metabolic alkalosis
Answer: C
Rationale: As renal function declines, the kidneys are less able to excrete phosphate,
leading to hyperphosphatemia which binds to ionized calcium. Additionally, the failing
kidney cannot activate Vitamin D (calcitriol), which is essential for intestinal calcium
absorption. The resulting hypocalcemia stimulates the parathyroid glands to secrete more
PTH in an attempt to normalize serum calcium levels through bone resorption.
5. Which of the following is the hallmark of the ‘ebb phase’ of the metabolic response to
severe injury or burn?
A. Hypermetabolism
B. Increased cardiac output
C. Hyperglycemia
, D. Decreased oxygen consumption and hypovolemia
Answer: D
Rationale: The ebb phase occurs immediately following a severe injury or burn and
typically lasts for the first 24 to 48 hours. During this period, there is a decrease in
metabolic rate, oxygen consumption, and body temperature as the body attempts to
conserve energy. This phase is also characterized by a reduction in cardiac output and
tissue perfusion due to fluid shifts and hypovolemia.
6. Which pathophysiological process occurs in Type 1 Diabetes Mellitus but is typically absent
in Type 2 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Increased hepatic glucose production
C. Hyperglycemia-induced microvascular damage
D. Autoimmune destruction of pancreatic beta cells
Answer: D
Rationale: Type 1 Diabetes Mellitus is primarily an autoimmune disease where T-cell
mediated destruction of the beta cells in the Islets of Langerhans leads to an absolute
insulin deficiency. In contrast, Type 2 Diabetes is characterized by insulin resistance and
relative insulin deficiency rather than total destruction of the beta cells. Therefore, Type 1
patients require exogenous insulin for survival to prevent ketoacidosis.
Pathophysiology II | Actual Q&A with
Rationale (HSC4558 Final Exam) |
University of Central Florida
1. A patient presents with sudden onset of severe chest pain that radiates to the back and
describes it as a ‘tearing’ sensation. Which condition is most likely based on these clinical
manifestations?
A. Aortic dissection
B. Myocardial infarction
C. Pericarditis
D. Pneumothorax
Answer: A
Rationale: Aortic dissection is characterized by a longitudinal tear in the aortic wall,
allowing blood to enter the tunica media. The classic presentation is a sudden, sharp,
tearing or ripping pain that often radiates to the area between the shoulder blades. This is a
medical emergency that requires rapid intervention to prevent rupture and systemic
malperfusion.
2. Which mechanism best describes the development of pulmonary edema in a patient with
left-sided heart failure?
A. Increased pulmonary capillary hydrostatic pressure
,B. Decreased oncotic pressure in the pulmonary vasculature
C. Increased permeability of the alveolar-capillary membrane
D. Obstruction of the lymphatic drainage in the lungs
Answer: A
Rationale: In left-sided heart failure, the left ventricle is unable to pump blood effectively
into the systemic circulation, causing blood to back up into the pulmonary veins. This
backup leads to an increase in pulmonary capillary hydrostatic pressure, which forces fluid
out of the capillaries and into the lung tissue. This accumulation of fluid impairs gas
exchange and leads to the symptoms of dyspnea and crackles.
3. In the pathophysiology of Chronic Obstructive Pulmonary Disease (COPD), specifically
emphysema, what is the primary cause of airflow limitation?
A. Loss of elastic recoil and alveolar wall destruction
B. Excessive mucus production in the bronchioles
C. Acute reversible bronchoconstriction
D. Infection of the lower respiratory tract
Answer: A
Rationale: Emphysema involves the permanent enlargement of gas-exchange airways
accompanied by the destruction of alveolar walls without obvious fibrosis. The loss of
elastin results in a decrease in the elastic recoil of the lungs, which normally helps keep
,airways open during expiration. Consequently, the airways collapse during exhalation,
leading to air trapping and hyperinflation of the lungs.
4. A patient with chronic kidney disease (CKD) develops secondary hyperparathyroidism.
What is the initiating factor in this compensatory mechanism?
A. Excessive intake of dietary calcium
B. Direct stimulation of the parathyroid gland by urea
C. Hypocalcemia resulting from hyperphosphatemia and reduced Vitamin D activation
D. Metabolic alkalosis
Answer: C
Rationale: As renal function declines, the kidneys are less able to excrete phosphate,
leading to hyperphosphatemia which binds to ionized calcium. Additionally, the failing
kidney cannot activate Vitamin D (calcitriol), which is essential for intestinal calcium
absorption. The resulting hypocalcemia stimulates the parathyroid glands to secrete more
PTH in an attempt to normalize serum calcium levels through bone resorption.
5. Which of the following is the hallmark of the ‘ebb phase’ of the metabolic response to
severe injury or burn?
A. Hypermetabolism
B. Increased cardiac output
C. Hyperglycemia
, D. Decreased oxygen consumption and hypovolemia
Answer: D
Rationale: The ebb phase occurs immediately following a severe injury or burn and
typically lasts for the first 24 to 48 hours. During this period, there is a decrease in
metabolic rate, oxygen consumption, and body temperature as the body attempts to
conserve energy. This phase is also characterized by a reduction in cardiac output and
tissue perfusion due to fluid shifts and hypovolemia.
6. Which pathophysiological process occurs in Type 1 Diabetes Mellitus but is typically absent
in Type 2 Diabetes Mellitus?
A. Insulin resistance in peripheral tissues
B. Increased hepatic glucose production
C. Hyperglycemia-induced microvascular damage
D. Autoimmune destruction of pancreatic beta cells
Answer: D
Rationale: Type 1 Diabetes Mellitus is primarily an autoimmune disease where T-cell
mediated destruction of the beta cells in the Islets of Langerhans leads to an absolute
insulin deficiency. In contrast, Type 2 Diabetes is characterized by insulin resistance and
relative insulin deficiency rather than total destruction of the beta cells. Therefore, Type 1
patients require exogenous insulin for survival to prevent ketoacidosis.
