Midtem & Final Exams: NR569 / NR 569 (Latest
Updates STUDY BUNDLE ) Differential Diagnosis in Acute Care
Practicum Exam Reviews| Week 1-8|Questions and Verified
Answers|100% Correct|Grade A - Chamberlain
Section 1: Clinical Reasoning & Diagnostic Frameworks
1. A nurse practitioner student presents a complex case using the SNApps framework. After
summarizing the history and physical, the student narrows the differential to three
possibilities and begins comparing and contrasting clinical findings. Which component of
SNApps is the student demonstrating?
A. Probe
B. Analyze
C. Plan
D. Select
Correct Answer: B
Rationale: SNApps stands for Summarize, Narrow, Analyze, Probe, Plan, and Select. The
Analyze phase involves comparing and contrasting narrowed differential diagnoses by exploring
pertinent positives and negatives. This differs from Probe (asking preceptor questions), Plan
(proposing management), and Select (choosing the most likely diagnosis with reflection).
2. Which mnemonic correctly identifies the components assessed in a comprehensive
symptom analysis?
A. Onset, Location/radiation, Duration, Character, Aggravating factors, Relieving factors, Timing,
Severity
B. Onset, Location, Description, Course, Associated symptoms, Risk factors, Treatment, Status
C. Origin, Length, Duration, Character, Aggravating, Resolution, Timing, Severity
D. Onset, Lymph nodes, Duration, Character, Aggravating, Relieving, Treatment, Severity
Correct Answer: A
Rationale: OLDCARTS expands to Onset, Location/Radiation, Duration, Character,
Aggravating factors, Relieving factors, Timing, and Severity. This framework ensures a complete,
chronologic HPI that supports accurate differential diagnosis. Other options substitute incorrect
terms or include irrelevant elements.
,3. A diagnostic test has a sensitivity of 95% for detecting pulmonary embolism. Which
principle best describes the clinical application?
A. SpPin: A positive test rules IN the disease
B. SnNout: A negative test effectively rules OUT the disease
C. A positive test confirms the diagnosis
D. The test has high specificity for pulmonary embolism
Correct Answer: B
Rationale: Sensitivity is the probability of a positive test when disease is present. "SnNout"
indicates that a highly Sensitive test, when Negative, rules OUT disease. D-dimer uses this
principle (high sensitivity, low specificity) to exclude PE when negative in low-risk patients.
4. A patient with low pretest probability (10%) for PE has a positive test with sensitivity 85%
and specificity 95%. What is the primary clinical concern?
A. The test is highly sensitive and rules out PE
B. The positive predictive value is low, risking false positives
C. The negative predictive value is high
D. Specificity is more important than sensitivity in this case
Correct Answer: B
Rationale: With low pretest probability, even high specificity yields low positive predictive
value (~65%). This means 35% of positive results will be false positives. This is the statistical
basis for using Wells criteria and D-dimer strategy—avoiding imaging in low-risk patients to
prevent overdiagnosis.
5. A 68-year-old male presents with acute chest pain. The ACNP generates multiple competing
diagnoses simultaneously based on initial presentation, then systematically rules them in or
out. This describes:
A. Pattern recognition
B. Hypothesis-driven method
C. Bayesian analysis
D. Anchoring bias
, Correct Answer: B
Rationale: The hypothesis-driven method involves generating multiple diagnostic
hypotheses early based on initial data, then systematically testing each through focused
assessment. This reduces cognitive bias and anchoring—leading causes of diagnostic error in
acute care.
6. A 55-year-old female with dyspnea has a Wells score estimating PE pretest probability at
15%. D-dimer returns at 450 ng/mL (negative <500). Using Bayesian analysis, what is the most
appropriate next step?
A. Discharge since negative D-dimer conclusively rules out PE
B. Proceed directly to CTPA because pretest probability is too high
C. Calculate post-test probability using negative likelihood ratio
D. Repeat D-dimer in 24 hours
Correct Answer: C
Rationale: Bayesian analysis requires combining pretest probability with test characteristics
(likelihood ratios) to determine post-test probability. A D-dimer near the cutoff with moderate
pretest probability does not automatically exclude PE; the negative likelihood ratio must be
applied. If post-test probability remains above treatment threshold, imaging is warranted.
7. In the NGN Clinical Judgment Measurement Model, which action represents "Analyze Cues"
when a 75-year-old presents with confusion, hypotension (BP 88/50), and temperature
38.9°C?
A. Immediately administer broad-spectrum antibiotics
B. Recognize that altered mental status, hemodynamic instability, and fever form a cluster
suggesting sepsis
C. Prioritize which diagnosis is most likely before obtaining data
D. Evaluate response to initial fluid resuscitation
Correct Answer: B
Rationale: "Analyze Cues" in the CJMM involves recognizing patterns and clusters in clinical
data. The combination of altered mental status, hypotension, and fever forms a recognizable
sepsis cluster that should trigger immediate diagnostic and therapeutic action.
, 8. A 42-year-old female has progressive fatigue, myalgias, and low-grade fevers, now with
new petechiae and gum bleeding. Which red flag most significantly changes diagnostic
urgency?
A. Duration of symptoms beyond 10 days
B. New onset bleeding manifestations suggesting hematologic emergency
C. Presence of myalgias suggesting autoimmune process
D. Low-grade fevers suggesting undiagnosed infection
Correct Answer: B
Rationale: New bleeding manifestations with progressive constitutional symptoms is a
critical red flag suggesting thrombocytopenia, potentially indicating acute leukemia, aplastic
anemia, DIC, or severe sepsis. This requires immediate CBC with differential, coagulation
studies, and peripheral smear.
9. Which USPSTF grade indicates high certainty of substantial net benefit?
A. Grade A
B. Grade B
C. Grade C
D. Grade D
Correct Answer: A
Rationale: USPSTF Grade A indicates the service is recommended with high certainty that
the net benefit is substantial. Grade B indicates high certainty of moderate net benefit. Grade C
indicates selective offering based on professional judgment. Grade D recommends against the
service.
10. A 45-year-old male presents with acute abdominal pain. The ACNP uses pattern
recognition to rapidly identify the likely diagnosis. This cognitive process is:
A. Analytical reasoning
B. Intuitive pattern recognition
C. Hypothetico-deductive reasoning
D. Bayesian analysis
Correct Answer: B
Updates STUDY BUNDLE ) Differential Diagnosis in Acute Care
Practicum Exam Reviews| Week 1-8|Questions and Verified
Answers|100% Correct|Grade A - Chamberlain
Section 1: Clinical Reasoning & Diagnostic Frameworks
1. A nurse practitioner student presents a complex case using the SNApps framework. After
summarizing the history and physical, the student narrows the differential to three
possibilities and begins comparing and contrasting clinical findings. Which component of
SNApps is the student demonstrating?
A. Probe
B. Analyze
C. Plan
D. Select
Correct Answer: B
Rationale: SNApps stands for Summarize, Narrow, Analyze, Probe, Plan, and Select. The
Analyze phase involves comparing and contrasting narrowed differential diagnoses by exploring
pertinent positives and negatives. This differs from Probe (asking preceptor questions), Plan
(proposing management), and Select (choosing the most likely diagnosis with reflection).
2. Which mnemonic correctly identifies the components assessed in a comprehensive
symptom analysis?
A. Onset, Location/radiation, Duration, Character, Aggravating factors, Relieving factors, Timing,
Severity
B. Onset, Location, Description, Course, Associated symptoms, Risk factors, Treatment, Status
C. Origin, Length, Duration, Character, Aggravating, Resolution, Timing, Severity
D. Onset, Lymph nodes, Duration, Character, Aggravating, Relieving, Treatment, Severity
Correct Answer: A
Rationale: OLDCARTS expands to Onset, Location/Radiation, Duration, Character,
Aggravating factors, Relieving factors, Timing, and Severity. This framework ensures a complete,
chronologic HPI that supports accurate differential diagnosis. Other options substitute incorrect
terms or include irrelevant elements.
,3. A diagnostic test has a sensitivity of 95% for detecting pulmonary embolism. Which
principle best describes the clinical application?
A. SpPin: A positive test rules IN the disease
B. SnNout: A negative test effectively rules OUT the disease
C. A positive test confirms the diagnosis
D. The test has high specificity for pulmonary embolism
Correct Answer: B
Rationale: Sensitivity is the probability of a positive test when disease is present. "SnNout"
indicates that a highly Sensitive test, when Negative, rules OUT disease. D-dimer uses this
principle (high sensitivity, low specificity) to exclude PE when negative in low-risk patients.
4. A patient with low pretest probability (10%) for PE has a positive test with sensitivity 85%
and specificity 95%. What is the primary clinical concern?
A. The test is highly sensitive and rules out PE
B. The positive predictive value is low, risking false positives
C. The negative predictive value is high
D. Specificity is more important than sensitivity in this case
Correct Answer: B
Rationale: With low pretest probability, even high specificity yields low positive predictive
value (~65%). This means 35% of positive results will be false positives. This is the statistical
basis for using Wells criteria and D-dimer strategy—avoiding imaging in low-risk patients to
prevent overdiagnosis.
5. A 68-year-old male presents with acute chest pain. The ACNP generates multiple competing
diagnoses simultaneously based on initial presentation, then systematically rules them in or
out. This describes:
A. Pattern recognition
B. Hypothesis-driven method
C. Bayesian analysis
D. Anchoring bias
, Correct Answer: B
Rationale: The hypothesis-driven method involves generating multiple diagnostic
hypotheses early based on initial data, then systematically testing each through focused
assessment. This reduces cognitive bias and anchoring—leading causes of diagnostic error in
acute care.
6. A 55-year-old female with dyspnea has a Wells score estimating PE pretest probability at
15%. D-dimer returns at 450 ng/mL (negative <500). Using Bayesian analysis, what is the most
appropriate next step?
A. Discharge since negative D-dimer conclusively rules out PE
B. Proceed directly to CTPA because pretest probability is too high
C. Calculate post-test probability using negative likelihood ratio
D. Repeat D-dimer in 24 hours
Correct Answer: C
Rationale: Bayesian analysis requires combining pretest probability with test characteristics
(likelihood ratios) to determine post-test probability. A D-dimer near the cutoff with moderate
pretest probability does not automatically exclude PE; the negative likelihood ratio must be
applied. If post-test probability remains above treatment threshold, imaging is warranted.
7. In the NGN Clinical Judgment Measurement Model, which action represents "Analyze Cues"
when a 75-year-old presents with confusion, hypotension (BP 88/50), and temperature
38.9°C?
A. Immediately administer broad-spectrum antibiotics
B. Recognize that altered mental status, hemodynamic instability, and fever form a cluster
suggesting sepsis
C. Prioritize which diagnosis is most likely before obtaining data
D. Evaluate response to initial fluid resuscitation
Correct Answer: B
Rationale: "Analyze Cues" in the CJMM involves recognizing patterns and clusters in clinical
data. The combination of altered mental status, hypotension, and fever forms a recognizable
sepsis cluster that should trigger immediate diagnostic and therapeutic action.
, 8. A 42-year-old female has progressive fatigue, myalgias, and low-grade fevers, now with
new petechiae and gum bleeding. Which red flag most significantly changes diagnostic
urgency?
A. Duration of symptoms beyond 10 days
B. New onset bleeding manifestations suggesting hematologic emergency
C. Presence of myalgias suggesting autoimmune process
D. Low-grade fevers suggesting undiagnosed infection
Correct Answer: B
Rationale: New bleeding manifestations with progressive constitutional symptoms is a
critical red flag suggesting thrombocytopenia, potentially indicating acute leukemia, aplastic
anemia, DIC, or severe sepsis. This requires immediate CBC with differential, coagulation
studies, and peripheral smear.
9. Which USPSTF grade indicates high certainty of substantial net benefit?
A. Grade A
B. Grade B
C. Grade C
D. Grade D
Correct Answer: A
Rationale: USPSTF Grade A indicates the service is recommended with high certainty that
the net benefit is substantial. Grade B indicates high certainty of moderate net benefit. Grade C
indicates selective offering based on professional judgment. Grade D recommends against the
service.
10. A 45-year-old male presents with acute abdominal pain. The ACNP uses pattern
recognition to rapidly identify the likely diagnosis. This cognitive process is:
A. Analytical reasoning
B. Intuitive pattern recognition
C. Hypothetico-deductive reasoning
D. Bayesian analysis
Correct Answer: B
