Correct Answer: A

Rationale: The nurse should suspect measles based on the symptoms described, including the presence of Koplik spots (small, red spots with blue-white centers in the mouth). Measles typically presents with fever, irritability, runny nose, and a rash that begins on the face and spreads downward. Chickenpox (choice B) presents with vesicular lesions in different stages of healing and usually starts on the trunk. Fifth disease (choice C) presents with a 'slapped cheek' rash on the face and can cause joint pain. Scarlet fever (choice D) is characterized by a sandpaper-like rash, fever, and strawberry tongue.

Correct Answer: C

Rationale: In infants, monitoring IV flow rates is essential to prevent fluid overload, not cardiac overload. Excessive fluid administration can lead to complications such as pulmonary edema or congestive heart failure. It is crucial to maintain a balance between providing adequate hydration and avoiding fluid overload to prevent adverse outcomes. Options A, B, and D are incorrect because the primary concern is to prevent complications related to excess fluid rather than focusing on electrolyte balance, dehydration prevention, or avoiding cardiac overload.

Correct Answer: C

Rationale: Visible peristalsis and weight loss are classic clinical manifestations of pyloric stenosis. The obstruction at the pyloric sphincter causes visible peristalsis as the stomach tries to push food through the narrowed opening, leading to the appearance of waves across the abdomen. Weight loss occurs due to poor feeding and frequent vomiting associated with pyloric stenosis. Choices A, B, and D are incorrect. Abdominal rigidity and pain on palpation, rounded abdomen and hypoactive bowel sounds, as well as distention of the lower abdomen and constipation are not typically seen in pyloric stenosis.

Correct Answer: C

Rationale: Gavage feedings are necessary for infants with congenital heart defects to conserve the infant's energy by eliminating the need for sucking. This is important because sucking requires energy expenditure, which can be taxing for infants with cardiac defects. Choice A is incorrect as gavage feedings do not primarily limit the chance of vomiting. Choice B is incorrect because the speed of feeding administration is not the primary reason for using gavage feedings in this case. Choice D is incorrect as the regulation of the quantity of nutritional liquid is not the main purpose of gavage feedings in infants with congenital heart defects.

Correct Answer: A

Rationale: When assessing a child with suspected pneumonia, a healthcare provider is likely to observe a cough as a common clinical manifestation. Pneumonia often presents with symptoms such as cough, fever, difficulty breathing, and chest pain. Choice B, diarrhea, is not typically associated with pneumonia. Choice C, rash, is not a common clinical manifestation of pneumonia. Choice D, vomiting, is also not a typical symptom of pneumonia. Therefore, the correct answer is A: Cough.