Walden University NURS 6501 Exam 4 (docx) |
2026/2027 | Cardiovascular Pathophysiology Q&A |
Nursing
1. During early hemorrhage, which compensatory response initially preserves arterial pressure?
A) Reduced sympathetic outflow
B) Increased vagal tone
C) Increased sympathetic heart rate and systemic vascular resistance
D) Decreased renin release
Correct Answer: Increased sympathetic heart rate and systemic vascular resistance
Rationale: Baroreceptor unloading increases sympathetic activity, causing tachycardia and arteriolar
constriction. This response temporarily supports cardiac output and arterial pressure despite falling
preload. This distinction matters in hemodynamics because it connects physiology with observable
clinical findings. Competing choices describe different disturbances and do not account as directly
for the mechanism presented in this question.
2. An increase in venous return at unchanged contractility initially raises stroke volume through
which mechanism?
A) Reduced end-diastolic fiber length
B) Increased afterload alone
C) Decreased ventricular filling
D) Greater sarcomere stretch increases force of contraction
Correct Answer: Greater sarcomere stretch increases force of contraction
Rationale: The Frank-Starling mechanism links greater end-diastolic filling to stronger contraction
within physiologic limits. Excessive filling in a failing ventricle may instead produce congestion. This
distinction matters in hemodynamics because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
3. For a patient with a cardiac output of 4 L/min and heart rate of 80/min, what is the stroke volume?
A) 50 mL per beat
B) 20 mL per beat
C) 80 mL per beat
D) 320 mL per beat
,Correct Answer: 50 mL per beat
Rationale: Stroke volume equals cardiac output divided by heart rate, converting 4 L/min to 4000
mL/min. Dividing by 80 beats/min yields 50 mL per beat. This distinction matters in hemodynamics
because it connects physiology with observable clinical findings. Competing choices describe
different disturbances and do not account as directly for the mechanism presented in this question.
4. Why does marked tachycardia sometimes lower cardiac output despite a higher heart rate?
A) Prolonged diastole increases filling
B) Reduced myocardial oxygen demand
C) Shortened diastole reduces ventricular filling and stroke volume
D) Elimination of atrial contribution
Correct Answer: Shortened diastole reduces ventricular filling and stroke volume
Rationale: Cardiac output is the product of heart rate and stroke volume. Extreme tachycardia
reduces filling time and can impair coronary perfusion, offsetting the higher rate. This distinction
matters in hemodynamics because it connects physiology with observable clinical findings.
Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
5. A sudden rise in systemic vascular resistance increases which ventricular workload?
A) Right atrial preload exclusively
B) Left ventricular compliance
C) Left ventricular afterload
D) Coronary venous return
Correct Answer: Left ventricular afterload
Rationale: Systemic vascular resistance contributes to the pressure the left ventricle must overcome
during ejection. Increased afterload can reduce stroke volume and raise myocardial oxygen demand.
This distinction matters in hemodynamics because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
6. What primarily determines mean arterial pressure under steady-state conditions?
A) Heart rate divided by preload
B) Pulse pressure multiplied by ejection fraction
C) Cardiac output multiplied by systemic vascular resistance
,D) Venous pressure alone
Correct Answer: Cardiac output multiplied by systemic vascular resistance
Rationale: Mean arterial pressure is approximately cardiac output times systemic vascular
resistance when central venous pressure is small. Both pump performance and vascular tone
therefore matter. This distinction matters in hemodynamics because it connects physiology with
observable clinical findings. Competing choices describe different disturbances and do not account
as directly for the mechanism presented in this question.
7. A narrowed pulse pressure in hypovolemic shock most directly reflects which change?
A) Increased aortic compliance alone
B) Increased circulating volume
C) Increased left ventricular ejection
D) Reduced stroke volume
Correct Answer: Reduced stroke volume
Rationale: Pulse pressure is influenced by stroke volume and arterial compliance. Reduced
ventricular filling lowers stroke volume and often narrows pulse pressure in acute volume loss. This
distinction matters in hemodynamics because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
8. Which physiologic change most increases myocardial oxygen demand?
A) Reduced heart rate and wall tension
B) Reduced contractility
C) Increased diastolic relaxation alone
D) Increased heart rate and ventricular wall stress
Correct Answer: Increased heart rate and ventricular wall stress
Rationale: Heart rate, contractility, and ventricular wall tension drive oxygen demand. Tachycardia
also shortens coronary perfusion time and may worsen supply-demand mismatch. This distinction
matters in hemodynamics because it connects physiology with observable clinical findings.
Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
9. What initiates many atherosclerotic lesions in susceptible arteries?
A) Primary bacterial invasion of the media
B) Isolated venous valve failure
, C) Endothelial dysfunction with retention of apoB-containing lipoproteins
D) Acute platelet depletion
Correct Answer: Endothelial dysfunction with retention of apoB-containing lipoproteins
Rationale: Retained LDL and other apoB particles undergo modification and provoke endothelial
inflammation. Monocytes enter the intima and develop into lipid-laden macrophages. This
distinction matters in atherosclerosis because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
10. Foam cells within an early fatty streak arise chiefly from which process?
A) Erythrocyte uptake of HDL
B) Macrophage uptake of modified LDL
C) Neutrophil production of fibrin
D) Smooth muscle secretion of bile
Correct Answer: Macrophage uptake of modified LDL
Rationale: Macrophages ingest modified lipoproteins through scavenger receptors, forming foam
cells. Their accumulation and inflammatory signaling contribute to plaque progression. This
distinction matters in atherosclerosis because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
11. Which plaque feature most strongly predisposes to rupture and acute thrombosis?
A) Thick collagen cap with little inflammation
B) Thin fibrous cap over a large lipid-rich inflammatory core
C) Stable calcification without inflammation
D) Small lipid pool and abundant smooth muscle
Correct Answer: Thin fibrous cap over a large lipid-rich inflammatory core
Rationale: Inflammation and protease activity weaken the fibrous cap. Rupture exposes
thrombogenic plaque material and can trigger coronary thrombosis. This distinction matters in
atherosclerosis because it connects physiology with observable clinical findings. Competing
choices describe different disturbances and do not account as directly for the mechanism presented
in this question.
12. How does cigarette smoking accelerate atherosclerotic disease?
A) It consistently increases protective HDL function
2026/2027 | Cardiovascular Pathophysiology Q&A |
Nursing
1. During early hemorrhage, which compensatory response initially preserves arterial pressure?
A) Reduced sympathetic outflow
B) Increased vagal tone
C) Increased sympathetic heart rate and systemic vascular resistance
D) Decreased renin release
Correct Answer: Increased sympathetic heart rate and systemic vascular resistance
Rationale: Baroreceptor unloading increases sympathetic activity, causing tachycardia and arteriolar
constriction. This response temporarily supports cardiac output and arterial pressure despite falling
preload. This distinction matters in hemodynamics because it connects physiology with observable
clinical findings. Competing choices describe different disturbances and do not account as directly
for the mechanism presented in this question.
2. An increase in venous return at unchanged contractility initially raises stroke volume through
which mechanism?
A) Reduced end-diastolic fiber length
B) Increased afterload alone
C) Decreased ventricular filling
D) Greater sarcomere stretch increases force of contraction
Correct Answer: Greater sarcomere stretch increases force of contraction
Rationale: The Frank-Starling mechanism links greater end-diastolic filling to stronger contraction
within physiologic limits. Excessive filling in a failing ventricle may instead produce congestion. This
distinction matters in hemodynamics because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
3. For a patient with a cardiac output of 4 L/min and heart rate of 80/min, what is the stroke volume?
A) 50 mL per beat
B) 20 mL per beat
C) 80 mL per beat
D) 320 mL per beat
,Correct Answer: 50 mL per beat
Rationale: Stroke volume equals cardiac output divided by heart rate, converting 4 L/min to 4000
mL/min. Dividing by 80 beats/min yields 50 mL per beat. This distinction matters in hemodynamics
because it connects physiology with observable clinical findings. Competing choices describe
different disturbances and do not account as directly for the mechanism presented in this question.
4. Why does marked tachycardia sometimes lower cardiac output despite a higher heart rate?
A) Prolonged diastole increases filling
B) Reduced myocardial oxygen demand
C) Shortened diastole reduces ventricular filling and stroke volume
D) Elimination of atrial contribution
Correct Answer: Shortened diastole reduces ventricular filling and stroke volume
Rationale: Cardiac output is the product of heart rate and stroke volume. Extreme tachycardia
reduces filling time and can impair coronary perfusion, offsetting the higher rate. This distinction
matters in hemodynamics because it connects physiology with observable clinical findings.
Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
5. A sudden rise in systemic vascular resistance increases which ventricular workload?
A) Right atrial preload exclusively
B) Left ventricular compliance
C) Left ventricular afterload
D) Coronary venous return
Correct Answer: Left ventricular afterload
Rationale: Systemic vascular resistance contributes to the pressure the left ventricle must overcome
during ejection. Increased afterload can reduce stroke volume and raise myocardial oxygen demand.
This distinction matters in hemodynamics because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
6. What primarily determines mean arterial pressure under steady-state conditions?
A) Heart rate divided by preload
B) Pulse pressure multiplied by ejection fraction
C) Cardiac output multiplied by systemic vascular resistance
,D) Venous pressure alone
Correct Answer: Cardiac output multiplied by systemic vascular resistance
Rationale: Mean arterial pressure is approximately cardiac output times systemic vascular
resistance when central venous pressure is small. Both pump performance and vascular tone
therefore matter. This distinction matters in hemodynamics because it connects physiology with
observable clinical findings. Competing choices describe different disturbances and do not account
as directly for the mechanism presented in this question.
7. A narrowed pulse pressure in hypovolemic shock most directly reflects which change?
A) Increased aortic compliance alone
B) Increased circulating volume
C) Increased left ventricular ejection
D) Reduced stroke volume
Correct Answer: Reduced stroke volume
Rationale: Pulse pressure is influenced by stroke volume and arterial compliance. Reduced
ventricular filling lowers stroke volume and often narrows pulse pressure in acute volume loss. This
distinction matters in hemodynamics because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
8. Which physiologic change most increases myocardial oxygen demand?
A) Reduced heart rate and wall tension
B) Reduced contractility
C) Increased diastolic relaxation alone
D) Increased heart rate and ventricular wall stress
Correct Answer: Increased heart rate and ventricular wall stress
Rationale: Heart rate, contractility, and ventricular wall tension drive oxygen demand. Tachycardia
also shortens coronary perfusion time and may worsen supply-demand mismatch. This distinction
matters in hemodynamics because it connects physiology with observable clinical findings.
Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
9. What initiates many atherosclerotic lesions in susceptible arteries?
A) Primary bacterial invasion of the media
B) Isolated venous valve failure
, C) Endothelial dysfunction with retention of apoB-containing lipoproteins
D) Acute platelet depletion
Correct Answer: Endothelial dysfunction with retention of apoB-containing lipoproteins
Rationale: Retained LDL and other apoB particles undergo modification and provoke endothelial
inflammation. Monocytes enter the intima and develop into lipid-laden macrophages. This
distinction matters in atherosclerosis because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
10. Foam cells within an early fatty streak arise chiefly from which process?
A) Erythrocyte uptake of HDL
B) Macrophage uptake of modified LDL
C) Neutrophil production of fibrin
D) Smooth muscle secretion of bile
Correct Answer: Macrophage uptake of modified LDL
Rationale: Macrophages ingest modified lipoproteins through scavenger receptors, forming foam
cells. Their accumulation and inflammatory signaling contribute to plaque progression. This
distinction matters in atherosclerosis because it connects physiology with observable clinical
findings. Competing choices describe different disturbances and do not account as directly for the
mechanism presented in this question.
11. Which plaque feature most strongly predisposes to rupture and acute thrombosis?
A) Thick collagen cap with little inflammation
B) Thin fibrous cap over a large lipid-rich inflammatory core
C) Stable calcification without inflammation
D) Small lipid pool and abundant smooth muscle
Correct Answer: Thin fibrous cap over a large lipid-rich inflammatory core
Rationale: Inflammation and protease activity weaken the fibrous cap. Rupture exposes
thrombogenic plaque material and can trigger coronary thrombosis. This distinction matters in
atherosclerosis because it connects physiology with observable clinical findings. Competing
choices describe different disturbances and do not account as directly for the mechanism presented
in this question.
12. How does cigarette smoking accelerate atherosclerotic disease?
A) It consistently increases protective HDL function
