PATHOPHYSIOLOGY OF DISEASE: AN
INTRODUCTION TO CLINICAL MEDICINE
8TH EDITION
AUTHOR(S)GARY D. HAMMER; STEPHEN J.
MCPHEE
TEST BANK
1
Reference
– Ch. 1 — Introduction
Question Stem
A 68-year-old patient develops hypotension and lactic acidosis
after a large myocardial infarction. Which pathophysiologic
concept best explains why tissues distant from the infarct
become hypoxic despite normal arterial oxygen content?
Options
A. Reduced oxygen delivery due to decreased cardiac output.
B. Increased oxygen consumption from systemic fever.
C. Impaired oxygen diffusion across the alveolar-capillary
membrane.
D. Hemoglobin structural abnormality reducing PaO₂.
,Correct Answer
A
Rationales
Correct: The infarct decreased effective cardiac output,
lowering tissue perfusion and oxygen delivery even though
arterial oxygen content may be normal. Tissue hypoxia from low
flow states is a core pathophysiologic principle.
A (why not): — (correct)
B (incorrect): Fever increases consumption but would not alone
explain acute hypoxia after MI and lactic acidosis.
C (incorrect): Alveolar-capillary diffusion problems cause
hypoxemia (low PaO₂), not primarily low perfusion with normal
arterial oxygen.
D (incorrect): Hemoglobin structural abnormalities would lower
oxygen content globally and are unlikely to present acutely after
MI.
Teaching Point
Low cardiac output causes tissue hypoxia by reducing oxygen
delivery despite normal arterial oxygenation.
Citation
Hammer & McPhee (2021). Pathophysiology of Disease (8th
Ed.). Ch. 1.
,2
Reference
– Ch. 1 — Introduction
Question Stem
A clinician asks why two patients with the same infecting
organism have markedly different clinical courses. Which
principle most directly explains variability in disease
expression?
Options
A. Fixed natural history of disease.
B. Host susceptibility and environmental modifiers.
C. Identical pathogen virulence always causes identical disease.
D. Laboratory measurement error.
Correct Answer
B
Rationales
Correct: Host genetic factors, immune status, comorbidities,
and environmental exposures alter disease expression and
clinical course, explaining interindividual variability.
A (incorrect): Natural history describes typical course but does
not account for host/environmental variability.
C (incorrect): Pathogen virulence contributes, but identical
organisms can cause different disease severities in different
hosts.
D (incorrect): Lab error may affect data but not the biological
variability in clinical course.
, Teaching Point
Host factors and environment drive variability in disease
expression.
Citation
Hammer & McPhee (2021). Pathophysiology of Disease (8th
Ed.). Ch. 1.
3
Reference
– Ch. 1 — Introduction
Question Stem
During rounds a student asks why markers such as troponin rise
after myocardial injury and remain elevated for days. Which
pathophysiologic explanation is best?
Options
A. Ongoing secretion from surviving myocytes.
B. Release from necrotic cell intracellular stores and slow
clearance.
C. Increased renal excretion prolongs circulating marker levels.
D. Antibody production against troponin elevates measured
levels.
Correct Answer
B
Rationales
Correct: Cardiac troponins are intracellular proteins released
INTRODUCTION TO CLINICAL MEDICINE
8TH EDITION
AUTHOR(S)GARY D. HAMMER; STEPHEN J.
MCPHEE
TEST BANK
1
Reference
– Ch. 1 — Introduction
Question Stem
A 68-year-old patient develops hypotension and lactic acidosis
after a large myocardial infarction. Which pathophysiologic
concept best explains why tissues distant from the infarct
become hypoxic despite normal arterial oxygen content?
Options
A. Reduced oxygen delivery due to decreased cardiac output.
B. Increased oxygen consumption from systemic fever.
C. Impaired oxygen diffusion across the alveolar-capillary
membrane.
D. Hemoglobin structural abnormality reducing PaO₂.
,Correct Answer
A
Rationales
Correct: The infarct decreased effective cardiac output,
lowering tissue perfusion and oxygen delivery even though
arterial oxygen content may be normal. Tissue hypoxia from low
flow states is a core pathophysiologic principle.
A (why not): — (correct)
B (incorrect): Fever increases consumption but would not alone
explain acute hypoxia after MI and lactic acidosis.
C (incorrect): Alveolar-capillary diffusion problems cause
hypoxemia (low PaO₂), not primarily low perfusion with normal
arterial oxygen.
D (incorrect): Hemoglobin structural abnormalities would lower
oxygen content globally and are unlikely to present acutely after
MI.
Teaching Point
Low cardiac output causes tissue hypoxia by reducing oxygen
delivery despite normal arterial oxygenation.
Citation
Hammer & McPhee (2021). Pathophysiology of Disease (8th
Ed.). Ch. 1.
,2
Reference
– Ch. 1 — Introduction
Question Stem
A clinician asks why two patients with the same infecting
organism have markedly different clinical courses. Which
principle most directly explains variability in disease
expression?
Options
A. Fixed natural history of disease.
B. Host susceptibility and environmental modifiers.
C. Identical pathogen virulence always causes identical disease.
D. Laboratory measurement error.
Correct Answer
B
Rationales
Correct: Host genetic factors, immune status, comorbidities,
and environmental exposures alter disease expression and
clinical course, explaining interindividual variability.
A (incorrect): Natural history describes typical course but does
not account for host/environmental variability.
C (incorrect): Pathogen virulence contributes, but identical
organisms can cause different disease severities in different
hosts.
D (incorrect): Lab error may affect data but not the biological
variability in clinical course.
, Teaching Point
Host factors and environment drive variability in disease
expression.
Citation
Hammer & McPhee (2021). Pathophysiology of Disease (8th
Ed.). Ch. 1.
3
Reference
– Ch. 1 — Introduction
Question Stem
During rounds a student asks why markers such as troponin rise
after myocardial injury and remain elevated for days. Which
pathophysiologic explanation is best?
Options
A. Ongoing secretion from surviving myocytes.
B. Release from necrotic cell intracellular stores and slow
clearance.
C. Increased renal excretion prolongs circulating marker levels.
D. Antibody production against troponin elevates measured
levels.
Correct Answer
B
Rationales
Correct: Cardiac troponins are intracellular proteins released
