Pathophysiology of Disease: An Introduction to
Clinical Medicine
8th Edition
Author(s)Gary D. Hammer; Stephen J. McPhee
TEST BANK
Reference: Ch. 1 — Introduction
Question Stem:
A 68-year-old man presents with progressive
fatigue and dyspnea. Laboratory studies show
normocytic anemia and elevated B-type
natriuretic peptide (BNP). As you integrate
pathophysiology into clinical reasoning, which
approach best distinguishes whether his
symptoms arise primarily from decreased
oxygen delivery versus cardiac dysfunction?
,Options (A–D):
A. Order serum ferritin and transferrin
saturation to assess iron stores.
B. Compare arterial oxygen saturation with
echocardiographic assessment of ejection
fraction.
C. Initiate iron therapy and reassess symptoms
in 4 weeks.
D. Measure troponin levels to rule out acute
ischemia.
Correct Answer:
B
Rationales:
Correct: Comparing arterial oxygen saturation
(oxygen delivery) with echocardiographic
ejection fraction (cardiac pump function) links
physiological measurements to the two
competing mechanisms — hypoxemia versus
pump failure — guiding targeted management.
A: Iron studies evaluate a cause of anemia but
,do not directly separate cardiac versus oxygen-
delivery mechanisms causing dyspnea.
C: Empiric iron therapy without diagnostic
clarification risks delaying appropriate cardiac
evaluation.
D: Troponin detects acute myocardial injury but
does not quantify chronic systolic dysfunction
or oxygen delivery.
Teaching Point:
Pair physiologic measurements (oxygenation)
with organ function tests (echocardiography) to
identify primary disease mechanisms.
Citation:
Hammer & McPhee (2021). Pathophysiology of
Disease (8th Ed.). Ch. 1.
Reference: Ch. 1 — Introduction
Question Stem:
A hospital implements a new sepsis protocol
, and tracks mortality before and after. Mortality
falls from 28% to 20%. Which epidemiologic
measure best estimates the absolute
improvement attributable to the protocol for
informed clinical decision-making?
Options (A–D):
A. Relative risk reduction (RRR)
B. Number needed to treat (NNT)
C. Odds ratio (OR)
D. Incidence rate ratio (IRR)
Correct Answer:
B
Rationales:
Correct: NNT translates absolute risk reduction
into how many patients must receive the
protocol to prevent one death, making it
directly actionable for clinicians.
A: RRR describes proportional change but can
exaggerate perceived benefit compared with
Clinical Medicine
8th Edition
Author(s)Gary D. Hammer; Stephen J. McPhee
TEST BANK
Reference: Ch. 1 — Introduction
Question Stem:
A 68-year-old man presents with progressive
fatigue and dyspnea. Laboratory studies show
normocytic anemia and elevated B-type
natriuretic peptide (BNP). As you integrate
pathophysiology into clinical reasoning, which
approach best distinguishes whether his
symptoms arise primarily from decreased
oxygen delivery versus cardiac dysfunction?
,Options (A–D):
A. Order serum ferritin and transferrin
saturation to assess iron stores.
B. Compare arterial oxygen saturation with
echocardiographic assessment of ejection
fraction.
C. Initiate iron therapy and reassess symptoms
in 4 weeks.
D. Measure troponin levels to rule out acute
ischemia.
Correct Answer:
B
Rationales:
Correct: Comparing arterial oxygen saturation
(oxygen delivery) with echocardiographic
ejection fraction (cardiac pump function) links
physiological measurements to the two
competing mechanisms — hypoxemia versus
pump failure — guiding targeted management.
A: Iron studies evaluate a cause of anemia but
,do not directly separate cardiac versus oxygen-
delivery mechanisms causing dyspnea.
C: Empiric iron therapy without diagnostic
clarification risks delaying appropriate cardiac
evaluation.
D: Troponin detects acute myocardial injury but
does not quantify chronic systolic dysfunction
or oxygen delivery.
Teaching Point:
Pair physiologic measurements (oxygenation)
with organ function tests (echocardiography) to
identify primary disease mechanisms.
Citation:
Hammer & McPhee (2021). Pathophysiology of
Disease (8th Ed.). Ch. 1.
Reference: Ch. 1 — Introduction
Question Stem:
A hospital implements a new sepsis protocol
, and tracks mortality before and after. Mortality
falls from 28% to 20%. Which epidemiologic
measure best estimates the absolute
improvement attributable to the protocol for
informed clinical decision-making?
Options (A–D):
A. Relative risk reduction (RRR)
B. Number needed to treat (NNT)
C. Odds ratio (OR)
D. Incidence rate ratio (IRR)
Correct Answer:
B
Rationales:
Correct: NNT translates absolute risk reduction
into how many patients must receive the
protocol to prevent one death, making it
directly actionable for clinicians.
A: RRR describes proportional change but can
exaggerate perceived benefit compared with
