NURS 231/NURS231 Module 8 V1 |
Pathophysiology Q&A with Rationale | Portage
Learning
1. Which of the following clinical manifestations is most characteristic of Syndrome of
Inappropriate Antidiuretic Hormone (SIADH)?
A. Hypernatremia
B. Increased serum osmolality
C. Excessive urine output
D. Dilutional hyponatremia
Correct Answer: D
Explanation: SIADH involves the excessive release of antidiuretic hormone, which leads to
significant water retention in the body. This excess water expands the extracellular fluid
volume and leads to dilutional hyponatremia as the sodium in the blood becomes overly
diluted. Consequently, patients typically present with low serum osmolality and highly
concentrated urine.
2. In the pathophysiology of Diabetes Insipidus, what is the primary deficiency or resistance
encountered?
A. Excessive Insulin
B. Antidiuretic Hormone (ADH)
,C. Aldosterone
D. Oxytocin
Correct Answer: B
Explanation: Diabetes Insipidus is characterized by a deficiency of ADH (Neurogenic) or a
decreased renal response to ADH (Nephrogenic). This lack of ADH prevents the kidneys
from reabsorbing water, leading to the excretion of large volumes of dilute urine. Patients
often suffer from extreme thirst and dehydration due to this massive fluid loss.
3. A patient is diagnosed with Acromegaly. This condition is caused by an overproduction of
which hormone after the closure of epiphyseal plates?
A. Thyroid Stimulating Hormone
B. Adrenocorticotropic Hormone
C. Prolactin
D. Growth Hormone
Correct Answer: D
Explanation: Acromegaly results from the hypersecretion of Growth Hormone (GH) during
adulthood, specifically after the growth plates have closed. While it does not cause
increased height, it leads to the enlargement of small bones in the hands and feet and
changes in facial features. If this excess GH occurred in childhood before plate closure, it
would instead cause Gigantism.
, 4. Which thyroid disorder is characterized by an autoimmune process where antibodies
stimulate the TSH receptors, leading to hyperthyroidism?
A. Hashimoto’s Thyroiditis
B. Graves’ Disease
C. Myxedema
D. Cretinism
Correct Answer: B
Explanation: Graves’ Disease is an autoimmune disorder where thyroid-stimulating
immunoglobulins (TSI) bind to and activate TSH receptors on the thyroid gland. This
stimulation results in excessive production of T3 and T4, leading to clinical
hyperthyroidism. Common symptoms include goiter, exophthalmos, and heat intolerance.
5. Hashimoto’s Thyroiditis is the most common cause of hypothyroidism. What is the
underlying pathophysiology of this condition?
A. Excessive iodine intake
B. Pituitary tumor secreting TSH
C. Autoimmune destruction of the thyroid gland
D. Bacterial infection of the thyroid
Correct Answer: C
Pathophysiology Q&A with Rationale | Portage
Learning
1. Which of the following clinical manifestations is most characteristic of Syndrome of
Inappropriate Antidiuretic Hormone (SIADH)?
A. Hypernatremia
B. Increased serum osmolality
C. Excessive urine output
D. Dilutional hyponatremia
Correct Answer: D
Explanation: SIADH involves the excessive release of antidiuretic hormone, which leads to
significant water retention in the body. This excess water expands the extracellular fluid
volume and leads to dilutional hyponatremia as the sodium in the blood becomes overly
diluted. Consequently, patients typically present with low serum osmolality and highly
concentrated urine.
2. In the pathophysiology of Diabetes Insipidus, what is the primary deficiency or resistance
encountered?
A. Excessive Insulin
B. Antidiuretic Hormone (ADH)
,C. Aldosterone
D. Oxytocin
Correct Answer: B
Explanation: Diabetes Insipidus is characterized by a deficiency of ADH (Neurogenic) or a
decreased renal response to ADH (Nephrogenic). This lack of ADH prevents the kidneys
from reabsorbing water, leading to the excretion of large volumes of dilute urine. Patients
often suffer from extreme thirst and dehydration due to this massive fluid loss.
3. A patient is diagnosed with Acromegaly. This condition is caused by an overproduction of
which hormone after the closure of epiphyseal plates?
A. Thyroid Stimulating Hormone
B. Adrenocorticotropic Hormone
C. Prolactin
D. Growth Hormone
Correct Answer: D
Explanation: Acromegaly results from the hypersecretion of Growth Hormone (GH) during
adulthood, specifically after the growth plates have closed. While it does not cause
increased height, it leads to the enlargement of small bones in the hands and feet and
changes in facial features. If this excess GH occurred in childhood before plate closure, it
would instead cause Gigantism.
, 4. Which thyroid disorder is characterized by an autoimmune process where antibodies
stimulate the TSH receptors, leading to hyperthyroidism?
A. Hashimoto’s Thyroiditis
B. Graves’ Disease
C. Myxedema
D. Cretinism
Correct Answer: B
Explanation: Graves’ Disease is an autoimmune disorder where thyroid-stimulating
immunoglobulins (TSI) bind to and activate TSH receptors on the thyroid gland. This
stimulation results in excessive production of T3 and T4, leading to clinical
hyperthyroidism. Common symptoms include goiter, exophthalmos, and heat intolerance.
5. Hashimoto’s Thyroiditis is the most common cause of hypothyroidism. What is the
underlying pathophysiology of this condition?
A. Excessive iodine intake
B. Pituitary tumor secreting TSH
C. Autoimmune destruction of the thyroid gland
D. Bacterial infection of the thyroid
Correct Answer: C
