A healthcare professional is reviewing the laboratory report of a child with tetralogy of Fallot that indicates an elevated RBC count. What does the professional identify as the cause of the polycythemia?

Correct Answer: B

Rationale: The correct answer is B: Tissue oxygen needs. Polycythemia occurs as the body's response to chronic hypoxia by increasing RBC production to enhance oxygen delivery. In tetralogy of Fallot, a congenital heart defect, the heart's structure causes reduced oxygen levels in the blood. This chronic hypoxia stimulates the bone marrow to produce more red blood cells, leading to an elevated RBC count. Choice A is incorrect as low blood pressure is not directly related to polycythemia in this context. Choice C, diminished iron level, is not the cause of polycythemia in tetralogy of Fallot. Choice D, hypertrophic cardiac muscle, is not the primary cause of the elevated RBC count in this case.

Correct Answer: D

Rationale: In a child with hypothyroidism, weight gain is a typical finding due to the slowed metabolism associated with the condition. This occurs because thyroid hormone levels are insufficient to regulate metabolism effectively. Choices A, B, and C are not typically associated with hypothyroidism. Nervousness is more commonly seen in conditions like hyperthyroidism, where there is an excess of thyroid hormones. Heat intolerance may be seen in hyperthyroidism as well, where the body's metabolism is increased. Smooth velvety skin is a characteristic finding in conditions like Cushing's syndrome, where there is excess cortisol production.

Correct Answer: B

Rationale: The correct answer is B. While special dietary needs may be important, they are not typically a primary concern for a 1-month-old with Down syndrome compared to monitoring for congenital issues. Getting cervical radiographs, an echocardiogram, and monitoring for respiratory infections are more crucial in the early care of a child with Down syndrome. Cervical radiographs help in assessing for atlantoaxial instability, an echocardiogram is important for detecting congenital heart defects common in Down syndrome, and monitoring for respiratory infections is vital due to the increased risk in these children.

Correct Answer: C

Rationale: Low-set ears with lobe creases are often associated with genetic disorders and can indicate underlying chromosomal abnormalities. This physical characteristic is known to be a common sign in various syndromes like Down syndrome. Choices A, B, and D are not directly linked to genetic disorders. Feeding problems and specific weight/height measurements are more general indicators of growth and development, while the ability to hop on one foot but not skip is a developmental milestone assessment that does not specifically point towards a genetic disorder.

Correct Answer: C

Rationale: The most appropriate response for the nurse is to emphasize the importance of consistency in discipline when dealing with toddlers. Toddlers are at an age where they are learning boundaries and acceptable behaviors. By being consistent, parents can help their child understand what is expected of them and establish a sense of structure and routine. Choices A, B, and D do not provide constructive advice or guidance on how to address the issue of disciplining a 2-year-old. Choice A merely acknowledges the age without providing guidance, choice B seeks more information without offering support, and choice D labels the age without offering practical advice on discipline.