NURS 6550 – COMPREHENSIVE QUESTIONS AND ANSWERS | VERIFIED AND WELLDETAILED
ANSWERS | DETAILED EXPLANATIONS AND RATIONALES | COMPLETE EXAM PREPARATION
STUDY GUIDE | PRACTICE QUESTIONS | LATEST EXAM UPDATE
•
•
CORE DOMAINS
• Cardiovascular and Hemodynamic Disorders
• Pulmonary and Respiratory Disorders
• Renal and Genitourinary Disorders
• Gastrointestinal and Hepatobiliary Disorders
• Neurologic and Neurocritical Conditions
• Endocrine and Metabolic Disorders
• Hematologic, Oncologic, and Immune Disorders
• Infectious and Systemic Inflammatory Conditions
• Critical Care Assessment, Diagnostics, and Therapeutics
• Advanced Practice Clinical Decision-Making and Patient Safety
INTRODUCTION
This comprehensive study assessment is designed to reinforce the advanced knowledge and
clinical reasoning expected in NURS 6550. Walden University identifies NURS 6550 as
Advanced Practice Care of Adults in Acute Care Settings I. The questions emphasize
assessment, differential diagnosis, interpretation of diagnostic findings, pathophysiology,
acute management, pharmacologic considerations, safety, and clinical decision-making.
Multiple-choice questions are used to practice recognizing important findings, distinguishing
similar disorders, prioritizing interventions, and applying concepts to realistic adult acute-
care situations. The goal is to promote understanding and clinical reasoning rather than
simple memorization.
•
•
SECTION ONE: QUESTIONS 1–100
Question 1.
A patient develops oliguria after a prolonged surgical procedure. The serum creatinine rises
from 0.9 mg/dL to 2.0 mg/dL. Which mechanism most directly contributes to prerenal acute
kidney injury?
A. Renal tubular obstruction by myoglobin
B. Reduced renal perfusion
,C. Direct glomerular immune injury
D. Renal interstitial inflammation
Correct Answer: B. Reduced renal perfusion
Explanation: Prerenal acute kidney injury results from inadequate renal blood flow and
therefore reduced glomerular filtration. Common causes include hypovolemia, decreased
cardiac output, and systemic vasodilation. Tubular obstruction and intrinsic renal
inflammation represent different mechanisms of kidney injury.
Question 2.
A patient presents with tachycardia, diaphoresis, anxiety, heat intolerance, and weight loss.
Which condition is most consistent with this presentation?
A. Hypothyroidism
B. Adrenal insufficiency
C. Hyperthyroidism
D. Hypoparathyroidism
Correct Answer: C. Hyperthyroidism
Explanation: Excess thyroid hormone increases metabolic activity and adrenergic
responsiveness. Typical manifestations include heat intolerance, weight loss, tachycardia,
tremor, anxiety, and diaphoresis.
Question 3.
A patient with acute decompensated heart failure develops severe dyspnea and diffuse
crackles. Which pathophysiologic process most directly explains the respiratory findings?
A. Decreased pulmonary capillary pressure
B. Increased pulmonary vascular permeability from infection
C. Increased pulmonary venous pressure causing fluid movement into the interstitium and
alveoli
D. Reduced left ventricular preload
Correct Answer: C. Increased pulmonary venous pressure causing fluid movement into the
interstitium and alveoli
Explanation: Left-sided heart failure increases pulmonary venous and capillary hydrostatic
pressure. Fluid subsequently moves into the pulmonary interstitium and alveoli, producing
pulmonary edema, crackles, hypoxemia, and dyspnea.
Question 4.
A patient with chronic obstructive pulmonary disease has increasing dyspnea and wheezing.
Which assessment finding most strongly suggests acute respiratory compromise?
,A. Respiratory rate of 18/min
B. Mildly productive cough
C. Increasing somnolence with rising PaCO₂
D. Oxygen saturation of 96% on room air
Correct Answer: C. Increasing somnolence with rising PaCO₂
Explanation: Increasing carbon dioxide can produce respiratory acidosis and altered mental
status. Somnolence in a patient with worsening hypercapnia is a concerning sign of
ventilatory failure and requires prompt reassessment and intervention.
Question 5.
Which laboratory pattern is most characteristic of metabolic acidosis?
A. Low pH and low bicarbonate
B. High pH and low bicarbonate
C. Low pH and high bicarbonate
D. High pH and high bicarbonate
Correct Answer: A. Low pH and low bicarbonate
Explanation: Metabolic acidosis is characterized by a primary reduction in serum
bicarbonate accompanied by a decrease in pH. Respiratory compensation generally occurs
through increased ventilation and reduced PaCO₂.
Question 6.
A patient has crushing substernal chest pain with diaphoresis and nausea. Which diagnostic
test should be obtained promptly when acute coronary syndrome is suspected?
A. Abdominal ultrasound
B. Twelve-lead electrocardiogram
C. Pulmonary function testing
D. Colonoscopy
Correct Answer: B. Twelve-lead electrocardiogram
Explanation: A 12-lead ECG should be obtained rapidly in suspected acute coronary
syndrome because it can identify ST-segment elevation and other ischemic changes that
influence urgent management.
Question 7.
Which cardiac biomarker is most specific for myocardial injury?
A. Myoglobin
B. Creatine kinase total
, C. Cardiac troponin
D. Lactate dehydrogenase
Correct Answer: C. Cardiac troponin
Explanation: Cardiac troponins are highly sensitive and specific markers of myocardial injury.
Myoglobin rises earlier but lacks cardiac specificity, while total CK is less specific than cardiac
troponin.
Question 8.
A patient with atrial fibrillation has a ventricular rate of 155/min and hypotension with
altered mental status. What is the priority intervention?
A. Oral anticoagulation
B. Immediate synchronized cardioversion
C. Ambulatory rhythm monitoring
D. Dietary sodium restriction
Correct Answer: B. Immediate synchronized cardioversion
Explanation: Hemodynamic instability attributable to tachyarrhythmia requires urgent
synchronized cardioversion. Anticoagulation remains important in atrial fibrillation but does
not take priority over stabilization of an unstable patient.
Question 9.
Which finding is most characteristic of right-sided heart failure?
A. Pulmonary crackles only
B. Peripheral edema and jugular venous distention
C. Hemoptysis
D. Unilateral wheezing
Correct Answer: B. Peripheral edema and jugular venous distention
Explanation: Right-sided heart failure causes systemic venous congestion. Common findings
include jugular venous distention, peripheral edema, hepatomegaly, ascites, and weight gain
from fluid retention.
Question 10.
A patient develops sudden pleuritic chest pain, tachycardia, and unexplained hypoxemia
following prolonged immobilization. Which diagnosis should be considered urgently?
A. Pulmonary embolism
B. Stable angina
C. Chronic bronchitis
D. Gastroesophageal reflux disease
ANSWERS | DETAILED EXPLANATIONS AND RATIONALES | COMPLETE EXAM PREPARATION
STUDY GUIDE | PRACTICE QUESTIONS | LATEST EXAM UPDATE
•
•
CORE DOMAINS
• Cardiovascular and Hemodynamic Disorders
• Pulmonary and Respiratory Disorders
• Renal and Genitourinary Disorders
• Gastrointestinal and Hepatobiliary Disorders
• Neurologic and Neurocritical Conditions
• Endocrine and Metabolic Disorders
• Hematologic, Oncologic, and Immune Disorders
• Infectious and Systemic Inflammatory Conditions
• Critical Care Assessment, Diagnostics, and Therapeutics
• Advanced Practice Clinical Decision-Making and Patient Safety
INTRODUCTION
This comprehensive study assessment is designed to reinforce the advanced knowledge and
clinical reasoning expected in NURS 6550. Walden University identifies NURS 6550 as
Advanced Practice Care of Adults in Acute Care Settings I. The questions emphasize
assessment, differential diagnosis, interpretation of diagnostic findings, pathophysiology,
acute management, pharmacologic considerations, safety, and clinical decision-making.
Multiple-choice questions are used to practice recognizing important findings, distinguishing
similar disorders, prioritizing interventions, and applying concepts to realistic adult acute-
care situations. The goal is to promote understanding and clinical reasoning rather than
simple memorization.
•
•
SECTION ONE: QUESTIONS 1–100
Question 1.
A patient develops oliguria after a prolonged surgical procedure. The serum creatinine rises
from 0.9 mg/dL to 2.0 mg/dL. Which mechanism most directly contributes to prerenal acute
kidney injury?
A. Renal tubular obstruction by myoglobin
B. Reduced renal perfusion
,C. Direct glomerular immune injury
D. Renal interstitial inflammation
Correct Answer: B. Reduced renal perfusion
Explanation: Prerenal acute kidney injury results from inadequate renal blood flow and
therefore reduced glomerular filtration. Common causes include hypovolemia, decreased
cardiac output, and systemic vasodilation. Tubular obstruction and intrinsic renal
inflammation represent different mechanisms of kidney injury.
Question 2.
A patient presents with tachycardia, diaphoresis, anxiety, heat intolerance, and weight loss.
Which condition is most consistent with this presentation?
A. Hypothyroidism
B. Adrenal insufficiency
C. Hyperthyroidism
D. Hypoparathyroidism
Correct Answer: C. Hyperthyroidism
Explanation: Excess thyroid hormone increases metabolic activity and adrenergic
responsiveness. Typical manifestations include heat intolerance, weight loss, tachycardia,
tremor, anxiety, and diaphoresis.
Question 3.
A patient with acute decompensated heart failure develops severe dyspnea and diffuse
crackles. Which pathophysiologic process most directly explains the respiratory findings?
A. Decreased pulmonary capillary pressure
B. Increased pulmonary vascular permeability from infection
C. Increased pulmonary venous pressure causing fluid movement into the interstitium and
alveoli
D. Reduced left ventricular preload
Correct Answer: C. Increased pulmonary venous pressure causing fluid movement into the
interstitium and alveoli
Explanation: Left-sided heart failure increases pulmonary venous and capillary hydrostatic
pressure. Fluid subsequently moves into the pulmonary interstitium and alveoli, producing
pulmonary edema, crackles, hypoxemia, and dyspnea.
Question 4.
A patient with chronic obstructive pulmonary disease has increasing dyspnea and wheezing.
Which assessment finding most strongly suggests acute respiratory compromise?
,A. Respiratory rate of 18/min
B. Mildly productive cough
C. Increasing somnolence with rising PaCO₂
D. Oxygen saturation of 96% on room air
Correct Answer: C. Increasing somnolence with rising PaCO₂
Explanation: Increasing carbon dioxide can produce respiratory acidosis and altered mental
status. Somnolence in a patient with worsening hypercapnia is a concerning sign of
ventilatory failure and requires prompt reassessment and intervention.
Question 5.
Which laboratory pattern is most characteristic of metabolic acidosis?
A. Low pH and low bicarbonate
B. High pH and low bicarbonate
C. Low pH and high bicarbonate
D. High pH and high bicarbonate
Correct Answer: A. Low pH and low bicarbonate
Explanation: Metabolic acidosis is characterized by a primary reduction in serum
bicarbonate accompanied by a decrease in pH. Respiratory compensation generally occurs
through increased ventilation and reduced PaCO₂.
Question 6.
A patient has crushing substernal chest pain with diaphoresis and nausea. Which diagnostic
test should be obtained promptly when acute coronary syndrome is suspected?
A. Abdominal ultrasound
B. Twelve-lead electrocardiogram
C. Pulmonary function testing
D. Colonoscopy
Correct Answer: B. Twelve-lead electrocardiogram
Explanation: A 12-lead ECG should be obtained rapidly in suspected acute coronary
syndrome because it can identify ST-segment elevation and other ischemic changes that
influence urgent management.
Question 7.
Which cardiac biomarker is most specific for myocardial injury?
A. Myoglobin
B. Creatine kinase total
, C. Cardiac troponin
D. Lactate dehydrogenase
Correct Answer: C. Cardiac troponin
Explanation: Cardiac troponins are highly sensitive and specific markers of myocardial injury.
Myoglobin rises earlier but lacks cardiac specificity, while total CK is less specific than cardiac
troponin.
Question 8.
A patient with atrial fibrillation has a ventricular rate of 155/min and hypotension with
altered mental status. What is the priority intervention?
A. Oral anticoagulation
B. Immediate synchronized cardioversion
C. Ambulatory rhythm monitoring
D. Dietary sodium restriction
Correct Answer: B. Immediate synchronized cardioversion
Explanation: Hemodynamic instability attributable to tachyarrhythmia requires urgent
synchronized cardioversion. Anticoagulation remains important in atrial fibrillation but does
not take priority over stabilization of an unstable patient.
Question 9.
Which finding is most characteristic of right-sided heart failure?
A. Pulmonary crackles only
B. Peripheral edema and jugular venous distention
C. Hemoptysis
D. Unilateral wheezing
Correct Answer: B. Peripheral edema and jugular venous distention
Explanation: Right-sided heart failure causes systemic venous congestion. Common findings
include jugular venous distention, peripheral edema, hepatomegaly, ascites, and weight gain
from fluid retention.
Question 10.
A patient develops sudden pleuritic chest pain, tachycardia, and unexplained hypoxemia
following prolonged immobilization. Which diagnosis should be considered urgently?
A. Pulmonary embolism
B. Stable angina
C. Chronic bronchitis
D. Gastroesophageal reflux disease
