NSG 530 EXAM 2 - ADVANCED
PATHOPHYSIOLOGY (WILKES)
QUESTIONS AND ANSWERS
1. In the context of heart failure, what is the primary mechanism of myocardial remodeling
initiated by chronic activation of the sympathetic nervous system?
A. Decreased production of angiotensin II and subsequent vasodilation.
B. Upregulation of calcium-ATPase pumps leading to enhanced contractility.
C. Downregulation of beta-adrenergic receptors and increased myocyte apoptosis.
D. Inhibition of collagen synthesis by cardiac fibroblasts.
Answer: C
Conceptual Explanation: Chronic sympathetic activation leads to high levels of
catecholamines, which causes downregulation of beta-receptors, oxidative stress, and
apoptosis, contributing to cardiac remodeling and dysfunction.
2. Which statement best describes the Frank-Starling Law in the failing heart?
A. The length-tension relationship becomes uncoupled, and increased stretch fails to
increase contractility.
,B. Increased end-diastolic volume always leads to increased stroke volume.
C. Increased afterload results in a compensatory increase in diastolic filling time.
D. Hypertrophy improves the sarcomere alignment, shifting the curve to the left.
Answer: A
Conceptual Explanation: In heart failure, the Frank-Starling curve flattens; beyond a
certain point, increased stretching of the myocytes does not result in increased cardiac
output due to overstretched sarcomeres.
3. Which pathophysiological process is primarily responsible for the development of
pulmonary edema in left-sided heart failure?
A. Decreased capillary oncotic pressure due to liver congestion.
B. Increased systemic vascular resistance inhibiting lymphatic drainage.
C. Release of nitric oxide causing pulmonary vasodilation and leakage.
D. Increased pulmonary capillary hydrostatic pressure exceeding interstitial pressure.
Answer: D
Conceptual Explanation: Left heart failure causes blood to back up into the pulmonary
circulation, raising capillary hydrostatic pressure, which forces fluid into the alveoli.
4. How does the body compensate for a decreased glomerular filtration rate (GFR) in the
early stages of Chronic Kidney Disease (CKD)?
A. Hypertrophy of the loop of Henle to increase water reabsorption.
, B. Decreased secretion of Renin to prevent systemic hypertension.
C. Dilation of the afferent arteriole and constriction of the efferent arteriole via RAAS.
D. Inhibition of atrial natriuretic peptide (ANP) to retain sodium.
Answer: C
Conceptual Explanation: Hyperfiltration occurs in remaining functional nephrons;
Angiotensin II constricts the efferent arteriole to maintain intraglomerular pressure
despite reduced total GFR.
5. In patients with COPD, what is the primary cause of pulmonary hypertension?
A. Hypoxic pulmonary vasoconstriction and vascular remodeling.
B. Increased production of surfactant leading to alveolar collapse.
C. Left ventricular failure causing pulmonary venous congestion.
D. Systemic inflammatory response causing vasodilation.
Answer: A
Conceptual Explanation: Chronic hypoxia in COPD causes reflex vasoconstriction of
pulmonary arteries and eventual structural remodeling (intimal thickening), leading to
pulmonary hypertension and Cor Pulmonale.
6. Which mechanism explains the development of secondary hyperparathyroidism in patients
with CKD?
A. Hyperphosphatemia and decreased production of 1,25-dihydroxyvitamin D3.
PATHOPHYSIOLOGY (WILKES)
QUESTIONS AND ANSWERS
1. In the context of heart failure, what is the primary mechanism of myocardial remodeling
initiated by chronic activation of the sympathetic nervous system?
A. Decreased production of angiotensin II and subsequent vasodilation.
B. Upregulation of calcium-ATPase pumps leading to enhanced contractility.
C. Downregulation of beta-adrenergic receptors and increased myocyte apoptosis.
D. Inhibition of collagen synthesis by cardiac fibroblasts.
Answer: C
Conceptual Explanation: Chronic sympathetic activation leads to high levels of
catecholamines, which causes downregulation of beta-receptors, oxidative stress, and
apoptosis, contributing to cardiac remodeling and dysfunction.
2. Which statement best describes the Frank-Starling Law in the failing heart?
A. The length-tension relationship becomes uncoupled, and increased stretch fails to
increase contractility.
,B. Increased end-diastolic volume always leads to increased stroke volume.
C. Increased afterload results in a compensatory increase in diastolic filling time.
D. Hypertrophy improves the sarcomere alignment, shifting the curve to the left.
Answer: A
Conceptual Explanation: In heart failure, the Frank-Starling curve flattens; beyond a
certain point, increased stretching of the myocytes does not result in increased cardiac
output due to overstretched sarcomeres.
3. Which pathophysiological process is primarily responsible for the development of
pulmonary edema in left-sided heart failure?
A. Decreased capillary oncotic pressure due to liver congestion.
B. Increased systemic vascular resistance inhibiting lymphatic drainage.
C. Release of nitric oxide causing pulmonary vasodilation and leakage.
D. Increased pulmonary capillary hydrostatic pressure exceeding interstitial pressure.
Answer: D
Conceptual Explanation: Left heart failure causes blood to back up into the pulmonary
circulation, raising capillary hydrostatic pressure, which forces fluid into the alveoli.
4. How does the body compensate for a decreased glomerular filtration rate (GFR) in the
early stages of Chronic Kidney Disease (CKD)?
A. Hypertrophy of the loop of Henle to increase water reabsorption.
, B. Decreased secretion of Renin to prevent systemic hypertension.
C. Dilation of the afferent arteriole and constriction of the efferent arteriole via RAAS.
D. Inhibition of atrial natriuretic peptide (ANP) to retain sodium.
Answer: C
Conceptual Explanation: Hyperfiltration occurs in remaining functional nephrons;
Angiotensin II constricts the efferent arteriole to maintain intraglomerular pressure
despite reduced total GFR.
5. In patients with COPD, what is the primary cause of pulmonary hypertension?
A. Hypoxic pulmonary vasoconstriction and vascular remodeling.
B. Increased production of surfactant leading to alveolar collapse.
C. Left ventricular failure causing pulmonary venous congestion.
D. Systemic inflammatory response causing vasodilation.
Answer: A
Conceptual Explanation: Chronic hypoxia in COPD causes reflex vasoconstriction of
pulmonary arteries and eventual structural remodeling (intimal thickening), leading to
pulmonary hypertension and Cor Pulmonale.
6. Which mechanism explains the development of secondary hyperparathyroidism in patients
with CKD?
A. Hyperphosphatemia and decreased production of 1,25-dihydroxyvitamin D3.
