NRS 455 Exam 3 V3 | NRS 455
Pathophysiology | Actual Q&A with
Rationale (NRS455 Exam 3) | Grand
Canyon University
1. A patient with Type 1 Diabetes Mellitus presents with deep, rapid respirations and a fruity
breath odor. Which pathophysiological process is primarily responsible for these symptoms?
A. Breakdown of fats for energy resulting in ketoacidosis
B. Excessive insulin production leading to hypoglycemia
C. Lactic acid buildup due to anaerobic metabolism
D. Severe dehydration from osmotic diuresis
Correct Answer: A
Rationale: The clinical presentation describes Kussmaul respirations and fruity breath
associated with Diabetic Ketoacidosis (DKA). In Type 1 Diabetes, the lack of insulin
prevents glucose utilization, forcing the body to break down fats for fuel. This metabolic
process produces acidic ketone bodies, leading to metabolic acidosis and the subsequent
compensatory respiratory response.
2. Which clinical manifestations should the nurse expect to find in a patient diagnosed with
Graves’ disease? (Select all that apply)
A. Exophthalmos
,B. Bradycardia
C. Heat intolerance
D. Weight gain
E. Tachycardia
F. Goiter
Correct Answer: A, C, E, F
Rationale: Graves’ disease is an autoimmune form of hyperthyroidism that results in a
hypermetabolic state. Clinical signs include exophthalmos, which is a protrusion of the eyes
caused by tissue inflammation, and tachycardia due to sympathetic nervous system
stimulation. Patients also frequently report heat intolerance and exhibit a goiter from
thyroid gland enlargement.
3. In the development of Chronic Kidney Disease (CKD), which factor is the most common
cause of end-stage renal disease in the United States?
A. Diabetes Mellitus
B. Chronic Pyelonephritis
C. Polycystic Kidney Disease
D. Systemic Lupus Erythematosus
Correct Answer: A
,Rationale: Diabetes Mellitus is the leading cause of CKD and end-stage renal disease
(ESRD) due to diabetic nephropathy. The high glucose levels cause damage to the
glomerular capillaries over time, leading to proteinuria and loss of nephron function.
Hypertension is the second most common cause, following diabetes.
4. A patient exhibits tremors, bradykinesia, and postural instability. The nurse understands
these symptoms are related to the depletion of which neurotransmitter?
A. Acetylcholine
B. Serotonin
C. Gamma-aminobutyric acid (GABA)
D. Dopamine
Correct Answer: D
Rationale: Parkinson’s disease is characterized by the degeneration of dopaminergic
neurons in the substantia nigra. The loss of dopamine leads to an imbalance with
acetylcholine, resulting in the classic motor symptoms of the disease. These include resting
tremors, muscle rigidity, and a slow, shuffling gait known as bradykinesia.
5. Which condition is classified as a pre-renal cause of Acute Kidney Injury (AKI)?
A. Hypovolemic shock
B. Benign Prostatic Hyperplasia
C. Nephrotoxic antibiotics
, D. Glomerulonephritis
Correct Answer: A
Rationale: Pre-renal AKI is caused by factors that impair blood flow to the kidneys, leading
to decreased glomerular filtration. Hypovolemic shock reduces the volume of blood
delivered to the renal arteries, which is a classic pre-renal mechanism. Intra-renal causes
involve direct damage to the kidney tissue, while post-renal causes involve obstruction of
urine flow.
6. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
Which laboratory finding is most consistent with this diagnosis?
A. Serum sodium of 120 mEq/L
B. Serum osmolality of 310 mOsm/kg
C. Urine specific gravity of 1.001
D. Hyperkalemia
Correct Answer: A
Rationale: SIADH involves the excessive secretion of ADH, which causes the kidneys to
reabsorb too much water. This results in dilutional hyponatremia and a concentrated urine
with high specific gravity. The excess water in the vascular space lowers the serum
osmolality, which is the opposite of what occurs in Diabetes Insipidus.
Pathophysiology | Actual Q&A with
Rationale (NRS455 Exam 3) | Grand
Canyon University
1. A patient with Type 1 Diabetes Mellitus presents with deep, rapid respirations and a fruity
breath odor. Which pathophysiological process is primarily responsible for these symptoms?
A. Breakdown of fats for energy resulting in ketoacidosis
B. Excessive insulin production leading to hypoglycemia
C. Lactic acid buildup due to anaerobic metabolism
D. Severe dehydration from osmotic diuresis
Correct Answer: A
Rationale: The clinical presentation describes Kussmaul respirations and fruity breath
associated with Diabetic Ketoacidosis (DKA). In Type 1 Diabetes, the lack of insulin
prevents glucose utilization, forcing the body to break down fats for fuel. This metabolic
process produces acidic ketone bodies, leading to metabolic acidosis and the subsequent
compensatory respiratory response.
2. Which clinical manifestations should the nurse expect to find in a patient diagnosed with
Graves’ disease? (Select all that apply)
A. Exophthalmos
,B. Bradycardia
C. Heat intolerance
D. Weight gain
E. Tachycardia
F. Goiter
Correct Answer: A, C, E, F
Rationale: Graves’ disease is an autoimmune form of hyperthyroidism that results in a
hypermetabolic state. Clinical signs include exophthalmos, which is a protrusion of the eyes
caused by tissue inflammation, and tachycardia due to sympathetic nervous system
stimulation. Patients also frequently report heat intolerance and exhibit a goiter from
thyroid gland enlargement.
3. In the development of Chronic Kidney Disease (CKD), which factor is the most common
cause of end-stage renal disease in the United States?
A. Diabetes Mellitus
B. Chronic Pyelonephritis
C. Polycystic Kidney Disease
D. Systemic Lupus Erythematosus
Correct Answer: A
,Rationale: Diabetes Mellitus is the leading cause of CKD and end-stage renal disease
(ESRD) due to diabetic nephropathy. The high glucose levels cause damage to the
glomerular capillaries over time, leading to proteinuria and loss of nephron function.
Hypertension is the second most common cause, following diabetes.
4. A patient exhibits tremors, bradykinesia, and postural instability. The nurse understands
these symptoms are related to the depletion of which neurotransmitter?
A. Acetylcholine
B. Serotonin
C. Gamma-aminobutyric acid (GABA)
D. Dopamine
Correct Answer: D
Rationale: Parkinson’s disease is characterized by the degeneration of dopaminergic
neurons in the substantia nigra. The loss of dopamine leads to an imbalance with
acetylcholine, resulting in the classic motor symptoms of the disease. These include resting
tremors, muscle rigidity, and a slow, shuffling gait known as bradykinesia.
5. Which condition is classified as a pre-renal cause of Acute Kidney Injury (AKI)?
A. Hypovolemic shock
B. Benign Prostatic Hyperplasia
C. Nephrotoxic antibiotics
, D. Glomerulonephritis
Correct Answer: A
Rationale: Pre-renal AKI is caused by factors that impair blood flow to the kidneys, leading
to decreased glomerular filtration. Hypovolemic shock reduces the volume of blood
delivered to the renal arteries, which is a classic pre-renal mechanism. Intra-renal causes
involve direct damage to the kidney tissue, while post-renal causes involve obstruction of
urine flow.
6. A patient is diagnosed with Syndrome of Inappropriate Antidiuretic Hormone (SIADH).
Which laboratory finding is most consistent with this diagnosis?
A. Serum sodium of 120 mEq/L
B. Serum osmolality of 310 mOsm/kg
C. Urine specific gravity of 1.001
D. Hyperkalemia
Correct Answer: A
Rationale: SIADH involves the excessive secretion of ADH, which causes the kidneys to
reabsorb too much water. This results in dilutional hyponatremia and a concentrated urine
with high specific gravity. The excess water in the vascular space lowers the serum
osmolality, which is the opposite of what occurs in Diabetes Insipidus.
