Correct Answer: C

Rationale: Monitoring Jackie's cardiac status is of the highest priority in a patient with rheumatic fever. Rheumatic fever can lead to permanent cardiac damage, making it crucial to closely monitor the heart. Assessing for signs of carditis, such as murmurs or other cardiac symptoms, is essential. The second priority is evaluating joint symptoms for the presence of polyarthritis and pain, which are common manifestations of rheumatic fever. While assessing Jackie's response to hospitalization is important for her emotional well-being, it is not the highest priority. The presence of a macular rash, although relevant, is not as high a priority as monitoring cardiac status or assessing joint symptoms.

Correct Answer: C

Rationale: Morphine is a narcotic analgesic that acts centrally to relieve pain by binding to opioid receptors in the CNS, leading to the depressed function of the CNS. Morphine also causes peripheral vasodilation, which can lead to increased blood flow. However, morphine causes venous dilation and increased venous capacity rather than decreased venous capacity. Therefore, the effect of 'Decreased venous capacity' is unrelated to Morphine's effects. Pain relief is a well-known effect of Morphine, as it acts on the CNS to alter the perception of pain.

Correct Answer: A

Rationale: Electrolytes are distributed unequally between intracellular and extracellular fluids. Sodium concentration is higher in extracellular fluid, while potassium concentration is higher in intracellular fluid. Therefore, the correct answer is 'There is a greater concentration of sodium in extracellular fluid and potassium in intracellular fluid.' Choices B, C, and D are incorrect because they do not accurately describe the typical distribution of sodium and potassium between intracellular and extracellular fluid.

Correct Answer: C

Rationale: The correct answer is C. Patient confidentiality must be maintained at all times to respect the patient's privacy and dignity. Disclosing sensitive information like a patient's prognosis in a public setting violates confidentiality and can cause distress. The nurse should intervene in this situation and educate the nursing student about the importance of not discussing confidential patient information in public. Choices A, B, and D do not involve breaching patient confidentiality and do not require immediate nurse intervention. Choice A focuses on infection control measures, choice B relates to clinical assessment, and choice D is about the doctor's rounds, which are not urgent matters requiring immediate intervention.

Correct Answer: B

Rationale: The correct answer is B: Bicarbonate 15 mEq/L. In metabolic acidosis, the bicarbonate levels are lower than normal. A bicarbonate value of 15 mEq/L indicates a deficit in the buffer system, contributing to the acidosis. Choices A, C, and D are incorrect. Choice A, PaO2 90 mm Hg, reflects oxygen partial pressure and is not directly related to metabolic acidosis. Choice C, CO2 47 mm Hg, represents carbon dioxide levels and is more indicative of respiratory status. Choice D, pH 7.34, falls within the normal range (7.35-7.45) and does not confirm metabolic acidosis.