NUR 546/NUR546 Exam 3 V3 | Advanced
Pathophysiology Q&A with Rationale |
William Paterson University
1. A patient presents with extreme thirst, polyuria, and a very low urine specific gravity. The
nurse suspects Diabetes Insipidus (DI). Which underlying mechanism is characteristic of
Neurogenic DI?
A. Organic lesion of the hypothalamus or pituitary interfering with ADH synthesis
B. Inadequate response of the renal tubules to ADH
C. Excessive intake of water leading to inhibition of ADH
D. Ectopic production of ADH by a tumor
Correct Answer: A
Expert Explanation: Neurogenic DI is caused by a deficiency in the synthesis or release of
Antidiuretic Hormone (ADH) due to damage to the hypothalamus or posterior pituitary.
This lack of ADH prevents the kidneys from reabsorbing water, leading to the excretion of
large volumes of dilute urine. Treatment typically involves hormone replacement with
desmopressin to restore water balance.
2. Which clinical finding is most indicative of Nephrotic Syndrome rather than Nephritic
Syndrome?
A. Gross hematuria and RBC casts
,B. Massive proteinuria greater than 3.5 g/day
C. Abrupt onset of hypertension
D. Oliguria and azotemia
Correct Answer: B
Expert Explanation: Nephrotic syndrome is characterized by heavy proteinuria exceeding
3.5 grams per 24 hours due to increased glomerular permeability. This loss of protein leads
to hypoalbuminemia, which in turn causes generalized edema and hyperlipidemia. In
contrast, nephritic syndrome is more commonly associated with inflammation, hematuria,
and hypertension.
3. In the development of Type 2 Diabetes Mellitus, what is the primary role of insulin
resistance?
A. The absolute destruction of pancreatic beta cells by autoimmune T-cells
B. Increased sensitivity of muscle cells to glucose uptake
C. The inability of the liver to produce glucose via gluconeogenesis
D. A decreased biological response to normal levels of circulating insulin
Correct Answer: D
Expert Explanation: Insulin resistance occurs when target tissues such as muscle, fat, and
the liver do not respond appropriately to insulin. This results in decreased glucose uptake
and storage, forcing the pancreas to secrete even more insulin to maintain normal blood
, sugar levels. Over time, beta-cell exhaustion occurs, leading to overt hyperglycemia and the
progression of Type 2 Diabetes.
4. A patient with chronic kidney disease (CKD) is found to have low serum calcium and high
serum phosphate. What is the most likely cause of this mineral imbalance?
A. Excessive intake of dairy products
B. Increased synthesis of active Vitamin D by the kidneys
C. Hypersecretion of calcitonin by the thyroid gland
D. Reduced renal excretion of phosphate and failure to activate Vitamin D
Correct Answer: D
Expert Explanation: In CKD, the failing kidneys cannot adequately excrete phosphate,
leading to hyperphosphatemia. Additionally, the kidneys lose the ability to convert Vitamin
D to its active form, which reduces intestinal calcium absorption. The resulting low serum
calcium triggers the parathyroid glands to release PTH, which can lead to secondary
hyperparathyroidism and bone disease.
5. Which pathophysiological process explains the development of esophageal varices in
patients with liver cirrhosis?
A. Decreased production of clotting factors leading to mucosal bleeding
B. Direct irritation of the esophagus by gastric acid reflux
C. Portal hypertension causing blood to shunt into collateral vessels
Pathophysiology Q&A with Rationale |
William Paterson University
1. A patient presents with extreme thirst, polyuria, and a very low urine specific gravity. The
nurse suspects Diabetes Insipidus (DI). Which underlying mechanism is characteristic of
Neurogenic DI?
A. Organic lesion of the hypothalamus or pituitary interfering with ADH synthesis
B. Inadequate response of the renal tubules to ADH
C. Excessive intake of water leading to inhibition of ADH
D. Ectopic production of ADH by a tumor
Correct Answer: A
Expert Explanation: Neurogenic DI is caused by a deficiency in the synthesis or release of
Antidiuretic Hormone (ADH) due to damage to the hypothalamus or posterior pituitary.
This lack of ADH prevents the kidneys from reabsorbing water, leading to the excretion of
large volumes of dilute urine. Treatment typically involves hormone replacement with
desmopressin to restore water balance.
2. Which clinical finding is most indicative of Nephrotic Syndrome rather than Nephritic
Syndrome?
A. Gross hematuria and RBC casts
,B. Massive proteinuria greater than 3.5 g/day
C. Abrupt onset of hypertension
D. Oliguria and azotemia
Correct Answer: B
Expert Explanation: Nephrotic syndrome is characterized by heavy proteinuria exceeding
3.5 grams per 24 hours due to increased glomerular permeability. This loss of protein leads
to hypoalbuminemia, which in turn causes generalized edema and hyperlipidemia. In
contrast, nephritic syndrome is more commonly associated with inflammation, hematuria,
and hypertension.
3. In the development of Type 2 Diabetes Mellitus, what is the primary role of insulin
resistance?
A. The absolute destruction of pancreatic beta cells by autoimmune T-cells
B. Increased sensitivity of muscle cells to glucose uptake
C. The inability of the liver to produce glucose via gluconeogenesis
D. A decreased biological response to normal levels of circulating insulin
Correct Answer: D
Expert Explanation: Insulin resistance occurs when target tissues such as muscle, fat, and
the liver do not respond appropriately to insulin. This results in decreased glucose uptake
and storage, forcing the pancreas to secrete even more insulin to maintain normal blood
, sugar levels. Over time, beta-cell exhaustion occurs, leading to overt hyperglycemia and the
progression of Type 2 Diabetes.
4. A patient with chronic kidney disease (CKD) is found to have low serum calcium and high
serum phosphate. What is the most likely cause of this mineral imbalance?
A. Excessive intake of dairy products
B. Increased synthesis of active Vitamin D by the kidneys
C. Hypersecretion of calcitonin by the thyroid gland
D. Reduced renal excretion of phosphate and failure to activate Vitamin D
Correct Answer: D
Expert Explanation: In CKD, the failing kidneys cannot adequately excrete phosphate,
leading to hyperphosphatemia. Additionally, the kidneys lose the ability to convert Vitamin
D to its active form, which reduces intestinal calcium absorption. The resulting low serum
calcium triggers the parathyroid glands to release PTH, which can lead to secondary
hyperparathyroidism and bone disease.
5. Which pathophysiological process explains the development of esophageal varices in
patients with liver cirrhosis?
A. Decreased production of clotting factors leading to mucosal bleeding
B. Direct irritation of the esophagus by gastric acid reflux
C. Portal hypertension causing blood to shunt into collateral vessels
