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HESI EVOLVE
PATHOPHYSIOLOGY
MASTERY EXAMINATION SERIES
100 Clinical Reasoning Questions with Correct Answers & Full Explanations
Covering:
⬢ Cardiovascular & Respiratory Pathophysiology
⬢ Renal, Endocrine & Metabolic Disorders
⬢ Neurological & Musculoskeletal Pathophysiology
⬢ Hematology, Immunology & Oncology
⬢ Gastrointestinal & Integumentary Pathophysiology
⬢ Fluid, Electrolyte & Acid-Base Imbalances
Aligned with HESI Evolve Exam Blueprint | NCLEX-RN Pathophysiology Framework
Correct answers are highlighted in green ✔
Full clinical rationale provided for every question
Examination Instructions
This examination contains 100 multiple-choice questions covering core pathophysiology
concepts tested on the HESI Evolve exam. Each question presents a clinical scenario
followed by four answer choices. The correct answer is highlighted in green with a
checkmark, and a detailed clinical rationale is provided below each question. Use this
material for active review, self-testing, and concept reinforcement.
Study Tip: Cover the answer options and rationale, attempt each question independently, then
review the explanation carefully — focusing on the pathophysiologic mechanism, not just the
correct answer letter.
, Page |2
Question 1
★ Cardiovascular Pathophysiology
A patient presents with crushing chest pain radiating to the left arm, diaphoresis, and ST-
elevation on ECG. Which pathophysiologic mechanism is primarily responsible for this
presentation?
A. Coronary artery vasospasm causing transient ischemia
B. Atherosclerotic plaque rupture with subsequent thrombosis occluding a coronary
artery ✔ CORRECT
C. Increased myocardial oxygen demand due to hypertension
D. Pericardial inflammation causing friction on the myocardium
📌 Rationale & Explanation:
ST-elevation myocardial infarction (STEMI) is classically caused by rupture of an atherosclerotic
plaque, which exposes subendothelial collagen and triggers platelet aggregation and thrombus
formation, leading to complete occlusion of a coronary artery. This results in transmural ischemia
(full-thickness), ST elevation, and cellular necrosis if not reperfused promptly. Vasospasm (A)
causes Prinzmetal angina with transient changes. Option C describes demand ischemia without
occlusion. Option D is pericarditis.
Question 2
★ Cardiovascular Pathophysiology
Which compensatory mechanism in heart failure leads to increased preload and ultimately
worsens cardiac remodeling?
A. Activation of the sympathetic nervous system increases heart rate
B. Renin-angiotensin-aldosterone system (RAAS) activation causing sodium and water
retention ✔ CORRECT
C. Release of atrial natriuretic peptide (ANP) promoting diuresis
D. Peripheral vasoconstriction increases afterload
📌 Rationale & Explanation:
In heart failure, reduced cardiac output activates the RAAS. Renin converts angiotensinogen to
angiotensin I, which becomes angiotensin II — a potent vasoconstrictor that stimulates aldosterone
release. Aldosterone causes sodium and water retention, increasing preload. While initially
compensatory, chronic RAAS activation causes myocardial fibrosis, ventricular hypertrophy, and
worsens remodeling. ANP (C) opposes this effect. SNS (A) increases heart rate and contractility.
Vasoconstriction (D) increases afterload, not preload.
Question 3
★ Cardiovascular Pathophysiology
A 68-year-old patient with a history of hypertension develops left-sided heart failure. Which
assessment finding is most consistent with this diagnosis?
A. Jugular venous distension and peripheral edema
B. Crackles in the lung bases and orthopnea ✔ CORRECT
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C. Hepatomegaly and ascites
D. Right ventricular heave on palpation
📌 Rationale & Explanation:
Left-sided heart failure causes backflow of blood into the pulmonary circulation. Elevated pulmonary
venous pressure forces fluid into the alveoli (pulmonary edema), heard as crackles (rales) at the
lung bases. Orthopnea (difficulty breathing when lying flat) occurs because recumbent position
redistributes fluid to the lungs, worsening congestion. JVD, peripheral edema, hepatomegaly, and
ascites (A, C) are signs of RIGHT-sided heart failure. Right ventricular heave (D) is associated with
right-sided overload or pulmonary hypertension.
Question 4
★ Cardiovascular Pathophysiology
Which pathologic change is the hallmark of atherosclerosis that distinguishes it from
arteriosclerosis?
A. Medial calcification of vessel walls due to calcium-phosphate deposition
B. Formation of lipid-rich plaques (atheromas) within the intimal layer of arteries ✔
CORRECT
C. Diffuse thickening and loss of elasticity of all vessel wall layers
D. Inflammation of the adventitial layer leading to vessel wall weakening
📌 Rationale & Explanation:
Atherosclerosis specifically involves the formation of atheromatous plaques in the intimal layer of
medium and large arteries. The process begins with endothelial injury, followed by LDL oxidation,
macrophage infiltration forming foam cells, smooth muscle migration, and fibrous cap formation. The
lipid-rich necrotic core covered by a fibrous cap is the hallmark atheroma. Arteriosclerosis (C) refers
to general hardening of arteries. Monckeberg's sclerosis (A) involves medial calcification. Adventitial
inflammation (D) describes periarteritis.
Question 5
★ Cardiovascular Pathophysiology
A patient with hypertension has a blood pressure of 180/110 mmHg. Which long-term
pathophysiologic effect on the heart is most likely to develop?
A. Dilated cardiomyopathy with decreased wall thickness
B. Left ventricular hypertrophy (LVH) due to chronic pressure overload ✔ CORRECT
C. Right ventricular hypertrophy from pulmonary hypertension
D. Mitral valve prolapse from papillary muscle dysfunction
📌 Rationale & Explanation:
Chronic systemic hypertension creates persistent pressure overload on the left ventricle. To maintain
cardiac output against increased afterload, the LV responds with concentric hypertrophy —
sarcomeres are added in parallel, increasing wall thickness without chamber dilation. Over time,
LVH reduces ventricular compliance (diastolic dysfunction), increases myocardial oxygen demand,
and is an independent risk factor for heart failure, arrhythmias, and sudden cardiac death. Dilated
cardiomyopathy (A) is a volume overload response. RVH (C) results from pulmonary disease.
, Page |4
Question 6
★ Respiratory Pathophysiology
A patient with COPD shows a FEV1/FVC ratio of 0.55. Which pathophysiologic process
best explains the chronic airflow obstruction in this patient?
A. Pulmonary fibrosis causing restrictive lung disease
B. Bronchial hyperresponsiveness causing reversible bronchoconstriction
C. Destruction of alveolar walls (emphysema) and chronic airway inflammation causing
irreversible obstruction ✔ CORRECT
D. Pulmonary hypertension reducing alveolar perfusion
📌 Rationale & Explanation:
COPD is characterized by persistent, largely irreversible airflow obstruction (FEV1/FVC < 0.70). Two
key pathologic processes occur: (1) Emphysema — protease-mediated destruction of alveolar walls
reduces elastic recoil, causing air trapping and dynamic collapse of small airways on expiration; (2)
Chronic bronchitis — inflammation and mucus hypersecretion narrow airways. Together, these
reduce expiratory flow rates. Bronchial hyperresponsiveness (B) characterizes asthma, which is
reversible. Pulmonary fibrosis (A) causes a restrictive pattern with preserved or elevated FEV1/FVC.
Question 7
★ Respiratory Pathophysiology
During an acute asthma exacerbation, which sequence of arterial blood gas changes would
be expected as the attack progresses from mild to severe?
A. Respiratory alkalosis → normal → respiratory acidosis ✔ CORRECT
B. Respiratory acidosis → metabolic alkalosis → normal
C. Metabolic acidosis → normal → respiratory alkalosis
D. Normal → metabolic acidosis → respiratory alkalosis
📌 Rationale & Explanation:
During an acute asthma attack: Early/mild phase — hyperventilation from anxiety and hypoxia
causes CO2 blow-off, resulting in respiratory ALKALOSIS (low PaCO2, high pH). As obstruction
worsens — PaCO2 normalizes (a deceptive 'normal' ABG that actually indicates fatigue and
impending failure). Severe/late phase — the patient tires, cannot maintain ventilation, CO2
accumulates, causing respiratory ACIDOSIS (high PaCO2, low pH). This progression indicates
respiratory failure requiring immediate intervention.
Question 8
★ Respiratory Pathophysiology
A patient develops sudden-onset pleuritic chest pain and hypoxia after a long-haul flight.
V/Q scanning shows a mismatched defect. Which pathophysiologic mechanism explains
the hypoxia?
A. Hypoventilation causing CO2 retention and displacement of oxygen
HESI EVOLVE
PATHOPHYSIOLOGY
MASTERY EXAMINATION SERIES
100 Clinical Reasoning Questions with Correct Answers & Full Explanations
Covering:
⬢ Cardiovascular & Respiratory Pathophysiology
⬢ Renal, Endocrine & Metabolic Disorders
⬢ Neurological & Musculoskeletal Pathophysiology
⬢ Hematology, Immunology & Oncology
⬢ Gastrointestinal & Integumentary Pathophysiology
⬢ Fluid, Electrolyte & Acid-Base Imbalances
Aligned with HESI Evolve Exam Blueprint | NCLEX-RN Pathophysiology Framework
Correct answers are highlighted in green ✔
Full clinical rationale provided for every question
Examination Instructions
This examination contains 100 multiple-choice questions covering core pathophysiology
concepts tested on the HESI Evolve exam. Each question presents a clinical scenario
followed by four answer choices. The correct answer is highlighted in green with a
checkmark, and a detailed clinical rationale is provided below each question. Use this
material for active review, self-testing, and concept reinforcement.
Study Tip: Cover the answer options and rationale, attempt each question independently, then
review the explanation carefully — focusing on the pathophysiologic mechanism, not just the
correct answer letter.
, Page |2
Question 1
★ Cardiovascular Pathophysiology
A patient presents with crushing chest pain radiating to the left arm, diaphoresis, and ST-
elevation on ECG. Which pathophysiologic mechanism is primarily responsible for this
presentation?
A. Coronary artery vasospasm causing transient ischemia
B. Atherosclerotic plaque rupture with subsequent thrombosis occluding a coronary
artery ✔ CORRECT
C. Increased myocardial oxygen demand due to hypertension
D. Pericardial inflammation causing friction on the myocardium
📌 Rationale & Explanation:
ST-elevation myocardial infarction (STEMI) is classically caused by rupture of an atherosclerotic
plaque, which exposes subendothelial collagen and triggers platelet aggregation and thrombus
formation, leading to complete occlusion of a coronary artery. This results in transmural ischemia
(full-thickness), ST elevation, and cellular necrosis if not reperfused promptly. Vasospasm (A)
causes Prinzmetal angina with transient changes. Option C describes demand ischemia without
occlusion. Option D is pericarditis.
Question 2
★ Cardiovascular Pathophysiology
Which compensatory mechanism in heart failure leads to increased preload and ultimately
worsens cardiac remodeling?
A. Activation of the sympathetic nervous system increases heart rate
B. Renin-angiotensin-aldosterone system (RAAS) activation causing sodium and water
retention ✔ CORRECT
C. Release of atrial natriuretic peptide (ANP) promoting diuresis
D. Peripheral vasoconstriction increases afterload
📌 Rationale & Explanation:
In heart failure, reduced cardiac output activates the RAAS. Renin converts angiotensinogen to
angiotensin I, which becomes angiotensin II — a potent vasoconstrictor that stimulates aldosterone
release. Aldosterone causes sodium and water retention, increasing preload. While initially
compensatory, chronic RAAS activation causes myocardial fibrosis, ventricular hypertrophy, and
worsens remodeling. ANP (C) opposes this effect. SNS (A) increases heart rate and contractility.
Vasoconstriction (D) increases afterload, not preload.
Question 3
★ Cardiovascular Pathophysiology
A 68-year-old patient with a history of hypertension develops left-sided heart failure. Which
assessment finding is most consistent with this diagnosis?
A. Jugular venous distension and peripheral edema
B. Crackles in the lung bases and orthopnea ✔ CORRECT
, Page |3
C. Hepatomegaly and ascites
D. Right ventricular heave on palpation
📌 Rationale & Explanation:
Left-sided heart failure causes backflow of blood into the pulmonary circulation. Elevated pulmonary
venous pressure forces fluid into the alveoli (pulmonary edema), heard as crackles (rales) at the
lung bases. Orthopnea (difficulty breathing when lying flat) occurs because recumbent position
redistributes fluid to the lungs, worsening congestion. JVD, peripheral edema, hepatomegaly, and
ascites (A, C) are signs of RIGHT-sided heart failure. Right ventricular heave (D) is associated with
right-sided overload or pulmonary hypertension.
Question 4
★ Cardiovascular Pathophysiology
Which pathologic change is the hallmark of atherosclerosis that distinguishes it from
arteriosclerosis?
A. Medial calcification of vessel walls due to calcium-phosphate deposition
B. Formation of lipid-rich plaques (atheromas) within the intimal layer of arteries ✔
CORRECT
C. Diffuse thickening and loss of elasticity of all vessel wall layers
D. Inflammation of the adventitial layer leading to vessel wall weakening
📌 Rationale & Explanation:
Atherosclerosis specifically involves the formation of atheromatous plaques in the intimal layer of
medium and large arteries. The process begins with endothelial injury, followed by LDL oxidation,
macrophage infiltration forming foam cells, smooth muscle migration, and fibrous cap formation. The
lipid-rich necrotic core covered by a fibrous cap is the hallmark atheroma. Arteriosclerosis (C) refers
to general hardening of arteries. Monckeberg's sclerosis (A) involves medial calcification. Adventitial
inflammation (D) describes periarteritis.
Question 5
★ Cardiovascular Pathophysiology
A patient with hypertension has a blood pressure of 180/110 mmHg. Which long-term
pathophysiologic effect on the heart is most likely to develop?
A. Dilated cardiomyopathy with decreased wall thickness
B. Left ventricular hypertrophy (LVH) due to chronic pressure overload ✔ CORRECT
C. Right ventricular hypertrophy from pulmonary hypertension
D. Mitral valve prolapse from papillary muscle dysfunction
📌 Rationale & Explanation:
Chronic systemic hypertension creates persistent pressure overload on the left ventricle. To maintain
cardiac output against increased afterload, the LV responds with concentric hypertrophy —
sarcomeres are added in parallel, increasing wall thickness without chamber dilation. Over time,
LVH reduces ventricular compliance (diastolic dysfunction), increases myocardial oxygen demand,
and is an independent risk factor for heart failure, arrhythmias, and sudden cardiac death. Dilated
cardiomyopathy (A) is a volume overload response. RVH (C) results from pulmonary disease.
, Page |4
Question 6
★ Respiratory Pathophysiology
A patient with COPD shows a FEV1/FVC ratio of 0.55. Which pathophysiologic process
best explains the chronic airflow obstruction in this patient?
A. Pulmonary fibrosis causing restrictive lung disease
B. Bronchial hyperresponsiveness causing reversible bronchoconstriction
C. Destruction of alveolar walls (emphysema) and chronic airway inflammation causing
irreversible obstruction ✔ CORRECT
D. Pulmonary hypertension reducing alveolar perfusion
📌 Rationale & Explanation:
COPD is characterized by persistent, largely irreversible airflow obstruction (FEV1/FVC < 0.70). Two
key pathologic processes occur: (1) Emphysema — protease-mediated destruction of alveolar walls
reduces elastic recoil, causing air trapping and dynamic collapse of small airways on expiration; (2)
Chronic bronchitis — inflammation and mucus hypersecretion narrow airways. Together, these
reduce expiratory flow rates. Bronchial hyperresponsiveness (B) characterizes asthma, which is
reversible. Pulmonary fibrosis (A) causes a restrictive pattern with preserved or elevated FEV1/FVC.
Question 7
★ Respiratory Pathophysiology
During an acute asthma exacerbation, which sequence of arterial blood gas changes would
be expected as the attack progresses from mild to severe?
A. Respiratory alkalosis → normal → respiratory acidosis ✔ CORRECT
B. Respiratory acidosis → metabolic alkalosis → normal
C. Metabolic acidosis → normal → respiratory alkalosis
D. Normal → metabolic acidosis → respiratory alkalosis
📌 Rationale & Explanation:
During an acute asthma attack: Early/mild phase — hyperventilation from anxiety and hypoxia
causes CO2 blow-off, resulting in respiratory ALKALOSIS (low PaCO2, high pH). As obstruction
worsens — PaCO2 normalizes (a deceptive 'normal' ABG that actually indicates fatigue and
impending failure). Severe/late phase — the patient tires, cannot maintain ventilation, CO2
accumulates, causing respiratory ACIDOSIS (high PaCO2, low pH). This progression indicates
respiratory failure requiring immediate intervention.
Question 8
★ Respiratory Pathophysiology
A patient develops sudden-onset pleuritic chest pain and hypoxia after a long-haul flight.
V/Q scanning shows a mismatched defect. Which pathophysiologic mechanism explains
the hypoxia?
A. Hypoventilation causing CO2 retention and displacement of oxygen
