Correct Answer: A

Rationale: The correct answer is A: Chest pain radiating to the arm and shortness of breath. These are classic signs of an acute myocardial infarction. Choice B is incorrect because nausea, vomiting, and high fever are not typical signs of a heart attack. Choice C is incorrect as headache, confusion, and low blood pressure are not specific to myocardial infarction. Choice D is incorrect because an acute myocardial infarction typically presents with an increased heart rate, not bradycardia.

Correct Answer: C

Rationale: The correct answer is C: Administer an incentive spirometer. Using an incentive spirometer helps prevent atelectasis by encouraging lung expansion after surgery. Encouraging deep breathing exercises (choice A) is beneficial but may not be as effective as an incentive spirometer. Encouraging the client to cough (choice B) helps with airway clearance but does not directly prevent atelectasis. Assisting the client to ambulate (choice D) is important for preventing complications such as deep vein thrombosis, but it is not the most effective intervention for preventing atelectasis.

Correct Answer: A

Rationale: Shortness of breath is the main symptom of left-sided heart failure because it results from pulmonary congestion due to fluid buildup in the lungs. Edema, increased heart rate, and decreased urine output are associated with right-sided heart failure rather than left-sided heart failure.

Correct Answer: B

Rationale: The correct answer is B. Applying diaper cream during each diaper change is important to prevent skin breakdown in infants with rotavirus. Rotavirus can cause diarrhea, which can lead to skin irritation. Avoiding feeding the baby for 12 hours (choice A) can lead to dehydration and is not appropriate. Giving water between feedings (choice C) can further contribute to dehydration. Applying warm compresses (choice D) may provide comfort but does not address the specific issue of preventing skin breakdown associated with rotavirus.

Correct Answer: C

Rationale: The correct answer is C: Hyponatremia. In SIADH, there is excessive release of antidiuretic hormone, causing water retention and dilutional hyponatremia. Polyuria (choice A) is increased urination, which is not a typical finding in SIADH. Dehydration (choice B) is the loss of body fluids, which is opposite to the fluid retention seen in SIADH. Hyperglycemia (choice D) is elevated blood sugar levels and is not directly related to SIADH.