NURS 231/NURS231 Module 3 V2 |
Pathophysiology Q&A with Rationale |
Portage Learning
1. A patient presents with dyspnea, orthopnea, and crackles upon auscultation of the lungs.
Which condition is most likely responsible for these clinical manifestations?
A. Left-sided heart failure
B. Right-sided heart failure
C. Peripheral vascular disease
D. Cor pulmonale
Correct Answer: A
Rationale: Left-sided heart failure leads to a backup of blood into the pulmonary
circulation, causing pulmonary edema and respiratory symptoms. Patients often
experience orthopnea, which is difficulty breathing while lying flat, and paroxysmal
nocturnal dyspnea. The presence of crackles is a hallmark sign of fluid accumulation in the
alveolar spaces due to increased pulmonary hydrostatic pressure.
2. Which of the following describes the fundamental pathology of atherosclerosis?
A. Dilation of the arterial walls due to high pressure
B. Inflammation of the veins leading to thrombus formation
C. The formation of fibro-fatty lesions in the intimal lining of arteries
,D. Congenital narrowing of the aortic arch
Correct Answer: C
Rationale: Atherosclerosis begins with endothelial injury followed by the accumulation of
LDLs in the arterial wall. Macrophages ingest these lipids to become foam cells, which then
aggregate to form a fatty streak. Over time, fibrous plaques develop, potentially leading to
vessel occlusion or rupture.
3. A 65-year-old male with a history of smoking presents with a barrel chest and a chronic
cough. His labs show an alpha-1 antitrypsin deficiency. What is the likely diagnosis?
A. Emphysema
B. Asthma
C. Chronic Bronchitis
D. Cystic Fibrosis
Correct Answer: A
Rationale: Emphysema involves the permanent enlargement of gas-exchange airways and
the destruction of alveolar walls. This loss of elastic recoil leads to air trapping, which
clinically manifests as a barrel chest. While smoking is the primary cause, a deficiency in
alpha-1 antitrypsin is a known genetic risk factor for the development of this disease.
4. What is the primary physiological effect of the Renin-Angiotensin-Aldosterone System
(RAAS) activation?
A. Increased blood volume and systemic vasoconstriction
, B. Increased excretion of sodium and water by the kidneys
C. Systemic vasodilation and decreased blood pressure
D. Decreased heart rate and cardiac output
Correct Answer: A
Rationale: RAAS is activated in response to low blood pressure or reduced renal blood
flow. Angiotensin II acts as a potent vasoconstrictor, while aldosterone promotes sodium
and water retention by the kidneys. Together, these mechanisms work to increase the
circulating blood volume and overall blood pressure.
5. Which type of chest pain is characterized by predictable onset during physical exertion and
is relieved by rest or nitroglycerin?
A. Unstable Angina
B. Prinzmetal Angina
C. Stable Angina
D. Myocardial Infarction
Correct Answer: C
Rationale: Stable angina occurs when myocardial oxygen demand exceeds supply, usually
during exercise or stress. It follows a predictable pattern and does not typically result in
permanent myocardial damage. Relief is achieved once the workload on the heart is
reduced or through pharmacological vasodilation.
Pathophysiology Q&A with Rationale |
Portage Learning
1. A patient presents with dyspnea, orthopnea, and crackles upon auscultation of the lungs.
Which condition is most likely responsible for these clinical manifestations?
A. Left-sided heart failure
B. Right-sided heart failure
C. Peripheral vascular disease
D. Cor pulmonale
Correct Answer: A
Rationale: Left-sided heart failure leads to a backup of blood into the pulmonary
circulation, causing pulmonary edema and respiratory symptoms. Patients often
experience orthopnea, which is difficulty breathing while lying flat, and paroxysmal
nocturnal dyspnea. The presence of crackles is a hallmark sign of fluid accumulation in the
alveolar spaces due to increased pulmonary hydrostatic pressure.
2. Which of the following describes the fundamental pathology of atherosclerosis?
A. Dilation of the arterial walls due to high pressure
B. Inflammation of the veins leading to thrombus formation
C. The formation of fibro-fatty lesions in the intimal lining of arteries
,D. Congenital narrowing of the aortic arch
Correct Answer: C
Rationale: Atherosclerosis begins with endothelial injury followed by the accumulation of
LDLs in the arterial wall. Macrophages ingest these lipids to become foam cells, which then
aggregate to form a fatty streak. Over time, fibrous plaques develop, potentially leading to
vessel occlusion or rupture.
3. A 65-year-old male with a history of smoking presents with a barrel chest and a chronic
cough. His labs show an alpha-1 antitrypsin deficiency. What is the likely diagnosis?
A. Emphysema
B. Asthma
C. Chronic Bronchitis
D. Cystic Fibrosis
Correct Answer: A
Rationale: Emphysema involves the permanent enlargement of gas-exchange airways and
the destruction of alveolar walls. This loss of elastic recoil leads to air trapping, which
clinically manifests as a barrel chest. While smoking is the primary cause, a deficiency in
alpha-1 antitrypsin is a known genetic risk factor for the development of this disease.
4. What is the primary physiological effect of the Renin-Angiotensin-Aldosterone System
(RAAS) activation?
A. Increased blood volume and systemic vasoconstriction
, B. Increased excretion of sodium and water by the kidneys
C. Systemic vasodilation and decreased blood pressure
D. Decreased heart rate and cardiac output
Correct Answer: A
Rationale: RAAS is activated in response to low blood pressure or reduced renal blood
flow. Angiotensin II acts as a potent vasoconstrictor, while aldosterone promotes sodium
and water retention by the kidneys. Together, these mechanisms work to increase the
circulating blood volume and overall blood pressure.
5. Which type of chest pain is characterized by predictable onset during physical exertion and
is relieved by rest or nitroglycerin?
A. Unstable Angina
B. Prinzmetal Angina
C. Stable Angina
D. Myocardial Infarction
Correct Answer: C
Rationale: Stable angina occurs when myocardial oxygen demand exceeds supply, usually
during exercise or stress. It follows a predictable pattern and does not typically result in
permanent myocardial damage. Relief is achieved once the workload on the heart is
reduced or through pharmacological vasodilation.
