MSN 622 Sentinel U Carl Resendez
Simulation Exam Bank – 200 Q&As
with Verified Rationales
, Q1. A 19-year-old male, Carl Resendez, presents to the clinic
complaining of polyuria, polydipsia, and occasional blurred vision.
Given his age and presentation, which initial laboratory test is most
critical to confirm a suspected diagnosis of Type 2 Diabetes Mellitus?
A. Fasting Plasma Insulin level
B. Hemoglobin A1c (HbA1c)
C. Oral Glucose Tolerance Test (OGTT) 3-hour post-load
D. Serum Ketone Panel
Correct Answer: B. Hemoglobin A1c (HbA1c)
Explanation: An HbA1c test is the gold standard for diagnosing diabetes mellitus as it
provides an average of blood glucose levels over the past 2 to 3 months. According to
current ADA guidelines, an HbA1c value of 6.5% or greater is diagnostic for diabetes. For
a presentation like Carl’s, it establishes long-term glycemic trends rather than a single
point-in-time measurement like fingerstick glucose.
Q2. During the physical examination of Carl Resendez, his blood
pressure is recorded as 146/90 mmHg. According to the current
American Heart Association (AHA) and American College of
Cardiology (ACC) guidelines, how should this blood pressure reading
be categorized?
A. Elevated Blood Pressure
B. Stage 1 Hypertension
C. Stage 2 Hypertension
D. Hypertensive Crisis
Correct Answer: C. Stage 2 Hypertension
Explanation: Stage 2 Hypertension is defined as a systolic blood pressure of 140 mmHg or
higher, or a diastolic blood pressure of 90 mmHg or higher. Carl’s reading of 146/90
mmHg fits firmly into Stage 2. In a patient with new-onset diabetes, strict blood pressure
control is crucial to reduce macrovascular and microvascular complications.
, Q3. Carl reports experiencing increased thirst (polydipsia). Which
pathophysiological mechanism directly explains this symptom in a
patient with uncontrolled hyperglycemia?
A. Intracellular dehydration caused by an osmotic gradient pulling water out of cells
B. Decreased antidiuretic hormone (ADH) secretion from the posterior pituitary
C. Direct stimulation of the hypothalamic satiety center by high serum glucose
D. Excessive loss of sodium causing secondary activation of the renin-angiotensin-
aldosterone system
Correct Answer: A. Intracellular dehydration caused by an osmotic gradient pulling water
out of cells
Explanation: In diabetes, high levels of glucose remain in the intravascular space,
creating an osmotic gradient. This shifts fluid from the intracellular fluid (ICF)
compartment to the extracellular fluid (ECF) compartment, causing intracellular
dehydration. The specialized osmoreceptors in the hypothalamus detect this cell shrinkage
and trigger the thirst mechanism.
Q4. In the clinical case of Carl Resendez, the provider includes
"Infectious Mononucleosis" in the initial differential diagnosis list.
Which presenting symptom or risk factor most likely prompted the
inclusion of this condition before lab results were obtained?
A. Severe polyuria
B. Elevated blood pressure
C. Visual disturbances
D. Fatigue and young adult age cohort
Correct Answer: D. Fatigue and young adult age cohort
Explanation: Infectious mononucleosis is common among adolescents and young adults
(such as a 19-year-old college student). It frequently presents with profound fatigue,
malaise, pharyngitis, and lymphadenopathy. Although Carl emphasizes polyuria and
polydipsia, systemic lethargy associated with early-stage diabetes can mimic the
constitutional exhaustion seen in mononucleosis.
, Q5. When reviewing a clean-catch urinalysis ordered for a patient
presenting like Carl Resendez, which specific finding would provide
the strongest evidence of renal compensation for severe
hyperglycemia?
A. Microalbuminuria
B. Glucosuria
C. Hematuria
D. High Specific Gravity (>1.030) without glucose
Correct Answer: B. Glucosuria
Explanation: When blood glucose levels exceed the renal threshold (typically around 180
mg/dL), the proximal convoluted tubules in the kidneys can no longer reabsorb the excess
filtered glucose. The excess glucose is excreted into the urine (glucosuria). This creates an
osmotic diuresis, directly resulting in the patient's polyuria.
Q6. The provider prescribes Metformin 500 mg PO BID with meals
for Carl’s new-onset Type 2 Diabetes. What is the primary mechanism
of action of Metformin?
A. Stimulating pancreatic beta cells to increase insulin secretion
B. Inhibiting hepatic glucose production and increasing peripheral insulin sensitivity
C. Delaying carbohydrate absorption in the brush border of the small intestine
D. Increasing glucose excretion via the sodium-glucose cotransporter 2 (SGLT2) in the
kidneys
Correct Answer: B. Inhibiting hepatic glucose production and increasing peripheral
insulin sensitivity
Explanation: Metformin is a biguanide that primarily works by decreasing hepatic
gluconeogenesis (glucose production by the liver) and improving insulin sensitivity in
peripheral tissues like skeletal muscle. It does not stimulate insulin secretion, which
minimizes the risk of hypoglycemia.
Q7. Which laboratory test must be evaluated before initiating
Metformin therapy to ensure patient safety and avoid a black-box
warning complication?
Simulation Exam Bank – 200 Q&As
with Verified Rationales
, Q1. A 19-year-old male, Carl Resendez, presents to the clinic
complaining of polyuria, polydipsia, and occasional blurred vision.
Given his age and presentation, which initial laboratory test is most
critical to confirm a suspected diagnosis of Type 2 Diabetes Mellitus?
A. Fasting Plasma Insulin level
B. Hemoglobin A1c (HbA1c)
C. Oral Glucose Tolerance Test (OGTT) 3-hour post-load
D. Serum Ketone Panel
Correct Answer: B. Hemoglobin A1c (HbA1c)
Explanation: An HbA1c test is the gold standard for diagnosing diabetes mellitus as it
provides an average of blood glucose levels over the past 2 to 3 months. According to
current ADA guidelines, an HbA1c value of 6.5% or greater is diagnostic for diabetes. For
a presentation like Carl’s, it establishes long-term glycemic trends rather than a single
point-in-time measurement like fingerstick glucose.
Q2. During the physical examination of Carl Resendez, his blood
pressure is recorded as 146/90 mmHg. According to the current
American Heart Association (AHA) and American College of
Cardiology (ACC) guidelines, how should this blood pressure reading
be categorized?
A. Elevated Blood Pressure
B. Stage 1 Hypertension
C. Stage 2 Hypertension
D. Hypertensive Crisis
Correct Answer: C. Stage 2 Hypertension
Explanation: Stage 2 Hypertension is defined as a systolic blood pressure of 140 mmHg or
higher, or a diastolic blood pressure of 90 mmHg or higher. Carl’s reading of 146/90
mmHg fits firmly into Stage 2. In a patient with new-onset diabetes, strict blood pressure
control is crucial to reduce macrovascular and microvascular complications.
, Q3. Carl reports experiencing increased thirst (polydipsia). Which
pathophysiological mechanism directly explains this symptom in a
patient with uncontrolled hyperglycemia?
A. Intracellular dehydration caused by an osmotic gradient pulling water out of cells
B. Decreased antidiuretic hormone (ADH) secretion from the posterior pituitary
C. Direct stimulation of the hypothalamic satiety center by high serum glucose
D. Excessive loss of sodium causing secondary activation of the renin-angiotensin-
aldosterone system
Correct Answer: A. Intracellular dehydration caused by an osmotic gradient pulling water
out of cells
Explanation: In diabetes, high levels of glucose remain in the intravascular space,
creating an osmotic gradient. This shifts fluid from the intracellular fluid (ICF)
compartment to the extracellular fluid (ECF) compartment, causing intracellular
dehydration. The specialized osmoreceptors in the hypothalamus detect this cell shrinkage
and trigger the thirst mechanism.
Q4. In the clinical case of Carl Resendez, the provider includes
"Infectious Mononucleosis" in the initial differential diagnosis list.
Which presenting symptom or risk factor most likely prompted the
inclusion of this condition before lab results were obtained?
A. Severe polyuria
B. Elevated blood pressure
C. Visual disturbances
D. Fatigue and young adult age cohort
Correct Answer: D. Fatigue and young adult age cohort
Explanation: Infectious mononucleosis is common among adolescents and young adults
(such as a 19-year-old college student). It frequently presents with profound fatigue,
malaise, pharyngitis, and lymphadenopathy. Although Carl emphasizes polyuria and
polydipsia, systemic lethargy associated with early-stage diabetes can mimic the
constitutional exhaustion seen in mononucleosis.
, Q5. When reviewing a clean-catch urinalysis ordered for a patient
presenting like Carl Resendez, which specific finding would provide
the strongest evidence of renal compensation for severe
hyperglycemia?
A. Microalbuminuria
B. Glucosuria
C. Hematuria
D. High Specific Gravity (>1.030) without glucose
Correct Answer: B. Glucosuria
Explanation: When blood glucose levels exceed the renal threshold (typically around 180
mg/dL), the proximal convoluted tubules in the kidneys can no longer reabsorb the excess
filtered glucose. The excess glucose is excreted into the urine (glucosuria). This creates an
osmotic diuresis, directly resulting in the patient's polyuria.
Q6. The provider prescribes Metformin 500 mg PO BID with meals
for Carl’s new-onset Type 2 Diabetes. What is the primary mechanism
of action of Metformin?
A. Stimulating pancreatic beta cells to increase insulin secretion
B. Inhibiting hepatic glucose production and increasing peripheral insulin sensitivity
C. Delaying carbohydrate absorption in the brush border of the small intestine
D. Increasing glucose excretion via the sodium-glucose cotransporter 2 (SGLT2) in the
kidneys
Correct Answer: B. Inhibiting hepatic glucose production and increasing peripheral
insulin sensitivity
Explanation: Metformin is a biguanide that primarily works by decreasing hepatic
gluconeogenesis (glucose production by the liver) and improving insulin sensitivity in
peripheral tissues like skeletal muscle. It does not stimulate insulin secretion, which
minimizes the risk of hypoglycemia.
Q7. Which laboratory test must be evaluated before initiating
Metformin therapy to ensure patient safety and avoid a black-box
warning complication?
