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REVISED MSN 570 ADVANCED PATHOPHYSIOLOGY FINAL
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1. A 68-year-old patient with chronic hypertension presents with
progressive dyspnea and fatigue. Echocardiogram reveals left
ventricular hypertrophy. This cardiac remodeling is best described as:
A. Physiological hypertrophy
B. Pathological hypertrophy
C. Compensatory hyperplasia
D. Dysplasia
Correct Answer: B. Pathological hypertrophy
Rationale: Pathological hypertrophy is an increase in cell size in
response to increased workload or injury. In hypertension, the left
ventricle hypertrophies to compensate for increased afterload, but
this adaptation is maladaptive and leads to further dysfunction.
Physiological hypertrophy, in contrast, occurs in response to exercise
and is reversible.
,2. A patient with a chronic venous stasis ulcer has non-healing
wound tissue that shows evidence of necrosis with preservation of
tissue architecture. This type of necrosis is best described as:
A. Liquefactive necrosis
B. Coagulative necrosis
C. Caseous necrosis
D. Fat necrosis
Correct Answer: B. Coagulative necrosis
Rationale: Coagulative necrosis is the most common type of necrosis
in solid organs and occurs when ischemia causes cell death while the
structural framework remains preserved. This is characteristic of
infarction. Liquefactive necrosis occurs in the brain, caseous necrosis
is seen in tuberculosis, and fat necrosis occurs in pancreatic and
breast tissue.
3. Which of the following is the most common cause of cellular
injury?
A. Free radical-induced injury
,B. Chemical injury
C. Hypoxia
D. Mechanical factors
Correct Answer: C. Hypoxia
Rationale: Hypoxia is the most common cause of cellular injury and
can be initiated by decreased oxygen in the environment, decreased
hemoglobin, decreased red blood cells, or cardiovascular collapse.
Hypoxia leads to ATP depletion, failure of the Na+/K+ ATPase
pump, cellular swelling, and ultimately cell death if prolonged.
4. A 45-year-old female with chronic gastroesophageal reflux disease
develops replacement of the normal squamous epithelium of the
lower esophagus with columnar epithelium. This cellular adaptation
is best described as:
A. Hypertrophy
B. Hyperplasia
C. Metaplasia
D. Dysplasia
Correct Answer: C. Metaplasia
, Rationale: Metaplasia is the reversible replacement of one
differentiated cell type with another. In Barrett's esophagus, chronic
acid exposure causes the squamous epithelium to be replaced by
columnar epithelium, which is better suited to the acidic
environment but increases the risk of adenocarcinoma.
5. What is the primary mechanism of cellular injury in ischemia?
A. Oxidative stress
B. ATP depletion
C. Protein misfolding
D. DNA damage
Correct Answer: B. ATP depletion
Rationale: Ischemia causes rapid ATP depletion within minutes,
leading to failure of the Na+/K+ ATPase pump, cellular swelling,
and irreversible injury if prolonged beyond 20 minutes. While
oxidative stress and DNA damage may occur, ATP depletion is the
primary and initial mechanism.
6. Which cellular adaptation occurs in response to chronic ethanol
exposure?