Correct Answer: A

Rationale: The correct outcome indicating effective treatment of diabetes insipidus in a male client is a fluid intake of less than 2,500 ml/day. In diabetes insipidus, excessive urination causes increased fluid intake to compensate for the fluid loss. By effectively managing the condition, the client's fluid intake should decrease. Choices B, C, and D do not directly reflect the effectiveness of treatment for diabetes insipidus. Increased urine output (choice B) may indicate inadequate control of the condition, while low blood pressure (choice C) and a high heart rate (choice D) are not specific indicators of effective treatment for diabetes insipidus.

Correct Answer: A

Rationale: Administering regular insulin intravenously is the priority nursing action in the acute phase of DKA. Insulin helps to lower blood glucose levels by promoting cellular uptake of glucose and inhibiting ketone production. Administering dextrose would be counterproductive as it can worsen hyperglycemia. Correcting acidosis is important but usually follows insulin administration. Applying an electrocardiogram monitor is not the priority action in the acute management of DKA.

Correct Answer: B

Rationale: The correct answer is B: Hyponatremia. Syndrome of inappropriate antidiuretic hormone (SIADH) is characterized by the excessive release of antidiuretic hormone (ADH), leading to water retention in the body. This causes dilutional hyponatremia, where the sodium levels in the blood become abnormally low. Option A, Hypernatremia, is incorrect because SIADH does not cause elevated sodium levels. Option C, Hyperkalemia, is incorrect as SIADH does not directly affect potassium levels. Option D, Hypercalcemia, is also incorrect as SIADH does not impact calcium levels.

Correct Answer: A

Rationale: In SIADH, there is excessive release of antidiuretic hormone (ADH), leading to water retention and dilutional hyponatremia. Hyponatremia is a hallmark finding in SIADH due to the imbalance between water and sodium levels. Hyperkalemia (Choice B) is not typically associated with SIADH. Hypercalcemia (Choice C) involves elevated calcium levels, which are not directly related to SIADH. Hypernatremia (Choice D) is the opposite of what occurs in SIADH, where sodium levels are usually diluted due to water retention.

Correct Answer: D

Rationale: The correct intervention for a client with syndrome of inappropriate antidiuretic hormone (SIADH) is to restrict oral fluids. SIADH leads to excessive release of antidiuretic hormone (ADH), causing the body to retain water and diluting the sodium levels in the blood (hyponatremia). Restricting oral fluids helps prevent further water retention and worsening hyponatremia. Encouraging increased fluid intake (choice A) would exacerbate the problem by further diluting sodium levels. Administering vasopressin (choice B) is not indicated in SIADH, as the condition is characterized by excess ADH secretion. Monitoring for signs of dehydration (choice C) is not the priority in SIADH since the issue is water retention rather than dehydration.