HSC 4558 Exam 1 V2 | HSC 4558 Pathophysiology II | Actual Q&A with
Rationale (HSC4558 Exam 1) | University of Central Florida
1. A patient presents with sudden shortness of breath, pleuritic chest pain, and hemoptysis.
Which of the following conditions is most likely responsible for these clinical manifestations?
A. Pulmonary Embolism
B. Left-sided Heart Failure
C. Chronic Bronchitis
D. Atelectasis
Answer: A
Explanation: A pulmonary embolism occurs when a blood clot blocks one of the
pulmonary arteries, leading to impaired gas exchange. The classic triad of symptoms
includes dyspnea, chest pain, and hemoptysis, though all three are present in only a
minority of cases. This condition requires immediate intervention to prevent right
ventricular failure and obstructive shock.
2. Which mechanism best describes the compensatory response to a decrease in cardiac
output in heart failure?
A. Parasympathetic nervous system activation
B. Activation of the renin-angiotensin-aldosterone system (RAAS)
C. Decreased peripheral vascular resistance
D. Inhibition of antidiuretic hormone (ADH)
Answer: B
Explanation: When cardiac output falls, the kidneys sense decreased perfusion and release
renin, which initiates the RAAS cascade. This leads to vasoconstriction and sodium/water
retention to increase blood volume and pressure. While intended to be compensatory,
chronic activation of this system eventually leads to deleterious remodeling of the heart.
3. A patient with a history of hypertension is diagnosed with left ventricular hypertrophy.
What is the primary cause of this structural change?
A. Increased preload
B. Increased afterload
C. Decreased myocardial oxygen demand
D. Increased venous return
,Answer: B
Explanation: Hypertension increases the resistance against which the left ventricle must
pump, which is defined as afterload. To maintain stroke volume against this pressure, the
myocardium undergoes compensatory hypertrophy to increase its contractile force. Over
time, this makes the ventricle less compliant and can lead to diastolic dysfunction.
4. Which laboratory value is the most specific indicator of acute myocardial infarction (MI)?
A. Creatine Kinase (CK-MB)
B. Myoglobin
C. Lactate Dehydrogenase (LDH)
D. Troponin I or T
Answer: D
Explanation: Troponin proteins are structural components of cardiac muscle and are
highly specific to myocardial tissue. Following cellular injury or necrosis during an MI,
these proteins are released into the bloodstream. They remain elevated for a longer period
than CK-MB, providing a wider diagnostic window.
5. What is the hallmark physiological finding in patients with emphysema?
A. Excessive mucus production in large airways
B. Reversible bronchospasm
C. Loss of elastic recoil and alveolar wall destruction
D. Pulmonary hypertension due to fluid overload
Answer: C
Explanation: Emphysema is characterized by the permanent enlargement of gas-exchange
airways accompanied by the destruction of alveolar walls. This leads to a loss of elastic
recoil, which causes air trapping and hyperinflation of the lungs. Unlike chronic bronchitis,
the primary issue is the structural integrity of the lung parenchyma rather than airway
inflammation.
6. A patient with chronic kidney disease (CKD) develops anemia. What is the most likely
pathophysiological reason?
A. Iron deficiency due to poor diet
B. Increased destruction of red blood cells in the spleen
C. Loss of blood through the urine
D. Reduced production of erythropoietin
Answer: D
, Explanation: The kidneys are the primary site for the production of erythropoietin, the
hormone that stimulates red blood cell production in the bone marrow. As renal function
declines in CKD, the production of this hormone decreases significantly. Consequently,
patients develop a normocytic, normochromic anemia that often requires exogenous
hormone replacement.
7. Which type of shock is characterized by a systemic inflammatory response leading to
massive vasodilation and increased capillary permeability?
A. Cardiogenic shock
B. Hypovolemic shock
C. Neurogenic shock
D. Septic shock
Answer: D
Explanation: Septic shock is a form of distributive shock caused by a systemic infection.
Endotoxins and inflammatory mediators cause widespread vasodilation and leakage of
fluid from the vascular space into the tissues. This results in a profound drop in blood
pressure and impaired tissue perfusion despite normal or high cardiac output.
8. Which EKG change is most indicative of hyperkalemia?
A. ST-segment depression
B. Peaked T waves
C. Prominent U waves
D. Shortened PR interval
Answer: B
Explanation: High serum potassium levels alter the repolarization phase of the cardiac
action potential. Peaked, narrow T waves are typically the earliest EKG sign of
hyperkalemia. As levels rise further, the PR interval lengthens and the QRS complex
widens, eventually leading to a sine wave pattern and cardiac arrest.
9. A patient is admitted with Acute Respiratory Distress Syndrome (ARDS). What is the
primary underlying pathophysiology of this condition?
A. Bronchial constriction and mucus plugging
B. Increased permeability of the alveolar-capillary membrane
C. Failure of the right ventricle to pump to the lungs
D. Primary bacterial infection of the lung parenchyma
Answer: B
Rationale (HSC4558 Exam 1) | University of Central Florida
1. A patient presents with sudden shortness of breath, pleuritic chest pain, and hemoptysis.
Which of the following conditions is most likely responsible for these clinical manifestations?
A. Pulmonary Embolism
B. Left-sided Heart Failure
C. Chronic Bronchitis
D. Atelectasis
Answer: A
Explanation: A pulmonary embolism occurs when a blood clot blocks one of the
pulmonary arteries, leading to impaired gas exchange. The classic triad of symptoms
includes dyspnea, chest pain, and hemoptysis, though all three are present in only a
minority of cases. This condition requires immediate intervention to prevent right
ventricular failure and obstructive shock.
2. Which mechanism best describes the compensatory response to a decrease in cardiac
output in heart failure?
A. Parasympathetic nervous system activation
B. Activation of the renin-angiotensin-aldosterone system (RAAS)
C. Decreased peripheral vascular resistance
D. Inhibition of antidiuretic hormone (ADH)
Answer: B
Explanation: When cardiac output falls, the kidneys sense decreased perfusion and release
renin, which initiates the RAAS cascade. This leads to vasoconstriction and sodium/water
retention to increase blood volume and pressure. While intended to be compensatory,
chronic activation of this system eventually leads to deleterious remodeling of the heart.
3. A patient with a history of hypertension is diagnosed with left ventricular hypertrophy.
What is the primary cause of this structural change?
A. Increased preload
B. Increased afterload
C. Decreased myocardial oxygen demand
D. Increased venous return
,Answer: B
Explanation: Hypertension increases the resistance against which the left ventricle must
pump, which is defined as afterload. To maintain stroke volume against this pressure, the
myocardium undergoes compensatory hypertrophy to increase its contractile force. Over
time, this makes the ventricle less compliant and can lead to diastolic dysfunction.
4. Which laboratory value is the most specific indicator of acute myocardial infarction (MI)?
A. Creatine Kinase (CK-MB)
B. Myoglobin
C. Lactate Dehydrogenase (LDH)
D. Troponin I or T
Answer: D
Explanation: Troponin proteins are structural components of cardiac muscle and are
highly specific to myocardial tissue. Following cellular injury or necrosis during an MI,
these proteins are released into the bloodstream. They remain elevated for a longer period
than CK-MB, providing a wider diagnostic window.
5. What is the hallmark physiological finding in patients with emphysema?
A. Excessive mucus production in large airways
B. Reversible bronchospasm
C. Loss of elastic recoil and alveolar wall destruction
D. Pulmonary hypertension due to fluid overload
Answer: C
Explanation: Emphysema is characterized by the permanent enlargement of gas-exchange
airways accompanied by the destruction of alveolar walls. This leads to a loss of elastic
recoil, which causes air trapping and hyperinflation of the lungs. Unlike chronic bronchitis,
the primary issue is the structural integrity of the lung parenchyma rather than airway
inflammation.
6. A patient with chronic kidney disease (CKD) develops anemia. What is the most likely
pathophysiological reason?
A. Iron deficiency due to poor diet
B. Increased destruction of red blood cells in the spleen
C. Loss of blood through the urine
D. Reduced production of erythropoietin
Answer: D
, Explanation: The kidneys are the primary site for the production of erythropoietin, the
hormone that stimulates red blood cell production in the bone marrow. As renal function
declines in CKD, the production of this hormone decreases significantly. Consequently,
patients develop a normocytic, normochromic anemia that often requires exogenous
hormone replacement.
7. Which type of shock is characterized by a systemic inflammatory response leading to
massive vasodilation and increased capillary permeability?
A. Cardiogenic shock
B. Hypovolemic shock
C. Neurogenic shock
D. Septic shock
Answer: D
Explanation: Septic shock is a form of distributive shock caused by a systemic infection.
Endotoxins and inflammatory mediators cause widespread vasodilation and leakage of
fluid from the vascular space into the tissues. This results in a profound drop in blood
pressure and impaired tissue perfusion despite normal or high cardiac output.
8. Which EKG change is most indicative of hyperkalemia?
A. ST-segment depression
B. Peaked T waves
C. Prominent U waves
D. Shortened PR interval
Answer: B
Explanation: High serum potassium levels alter the repolarization phase of the cardiac
action potential. Peaked, narrow T waves are typically the earliest EKG sign of
hyperkalemia. As levels rise further, the PR interval lengthens and the QRS complex
widens, eventually leading to a sine wave pattern and cardiac arrest.
9. A patient is admitted with Acute Respiratory Distress Syndrome (ARDS). What is the
primary underlying pathophysiology of this condition?
A. Bronchial constriction and mucus plugging
B. Increased permeability of the alveolar-capillary membrane
C. Failure of the right ventricle to pump to the lungs
D. Primary bacterial infection of the lung parenchyma
Answer: B
