Nursing Elites

1. When teaching a class about trisomy 21, the instructor would identify the cause of this disorder as:

• A. nondisjunction.
• B. X-linked recessive inheritance.
• C. genomic imprinting.
• D. autosomal dominant inheritance.

Correct answer: A

Rationale: The correct answer is A: nondisjunction. Trisomy 21, also known as Down syndrome, is caused by nondisjunction, which is an error in cell division leading to an extra copy of chromosome 21. This additional genetic material alters the course of development and causes the characteristics associated with Down syndrome. Choices B, C, and D are incorrect. X-linked recessive inheritance refers to genetic disorders carried on the X chromosome, genomic imprinting involves gene expression based on parental origin, and autosomal dominant inheritance relates to disorders caused by a dominant gene on one of the non-sex chromosomes. In the case of trisomy 21, the cause is specifically related to the error in chromosome division, making nondisjunction the most appropriate answer.

2. The nurse is conducting a physical examination of a 9-month-old baby with a flat, discolored area on the skin. The nurse documents this as a:

• A. Papule
• B. Macule
• C. Vesicle
• D. Scale

Correct answer: B

Rationale: A macule is defined as a flat, discolored area on the skin that is different from surrounding tissue due to a change in color. In this case, the baby has a flat, discolored area on the skin, which fits the description of a macule. A papule is a small, raised solid bump, a vesicle is a small fluid-filled blister, and a scale is a flake of skin that is often dry and rough. Therefore, choices A, C, and D do not accurately describe the flat, discolored area on the baby's skin, making them incorrect.

3. The nurse is obtaining a health history from parents of a 4-month-old boy with congenital hypothyroidism. What would the nurse most likely assess?

• A. The child's growth is above normal for his age.
• B. The child is active and playful.
• C. The skin appears pink and healthy.
• D. It is difficult to keep the child awake.

Correct answer: D

Rationale: The correct answer is D. Congenital hypothyroidism in infants often leads to lethargy and difficulty staying awake due to low thyroid hormone levels. Assessing the child's ability to stay awake is crucial in identifying signs of hypothyroidism. Choices A, B, and C are incorrect because above-normal growth, being active and playful, and having healthy-looking skin are not typical manifestations of congenital hypothyroidism. Instead, infants with hypothyroidism may exhibit poor weight gain, decreased activity, and dry, pale skin.

4. A 1-year-old child has a congenital cardiac malformation that causes right-to-left shunting of blood through the heart. What clinical finding should the nurse expect?

• A. Proteinuria
• B. Peripheral edema
• C. Elevated hematocrit
• D. Absence of pedal pulses

Correct answer: C

Rationale: In a child with a congenital cardiac malformation causing right-to-left shunting of blood, the nurse should expect an elevated hematocrit. This occurs because the body compensates for decreased oxygenation by producing more red blood cells. Proteinuria (Choice A) is not a typical clinical finding related to right-to-left shunting. Peripheral edema (Choice B) is more commonly associated with conditions causing volume overload, such as left-sided heart failure. Absence of pedal pulses (Choice D) is not directly related to right-to-left shunting but may be seen in conditions affecting peripheral circulation.

5. During a physical examination of an infant with Down syndrome, what anomaly should the healthcare provider assess the child for?

• A. Bulging fontanels
• B. Stiff lower extremities
• C. Abnormal heart sounds
• D. Unusual pupillary reactions

Correct answer: C

Rationale: Infants with Down syndrome are at increased risk of congenital heart defects. Therefore, assessing for abnormal heart sounds is crucial during the physical examination. Bulging fontanels are not typically associated with Down syndrome and may indicate increased intracranial pressure. Stiff lower extremities are not a common finding in Down syndrome and may suggest other musculoskeletal issues. Unusual pupillary reactions are not typically linked to Down syndrome and may be indicative of neurological problems instead.

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