Correct Answer: A

Rationale: Elevating the head of the bed to 60 to 90 degrees is essential when inserting an NG tube. This position helps facilitate the passage of the tube through the esophagus into the stomach and reduces the risk of aspiration. Administering an antiemetic may be necessary to control nausea or vomiting, but it is not the primary intervention when inserting an NG tube. Preparing the client for surgery is not indicated solely for the insertion of an NG tube. Providing oral care is important for maintaining oral hygiene but is not directly related to inserting an NG tube.

Correct Answer: C

Rationale: When the PR interval is prolonged, it signifies an increased conduction time from the SA node through the AV junction. This finding is characteristic of a first-degree heart block where there is a delay in the electrical conduction at the level of the AV node. Choices A, B, and D are incorrect as they do not accurately reflect the significance of a prolonged PR interval.

Correct Answer: B

Rationale: Before a renal biopsy, the nurse should review the serum creatinine level. Serum creatinine is a key indicator of kidney function. In clients with chronic kidney disease (CKD), monitoring creatinine levels is crucial as elevated levels may indicate worsening kidney function, which could impact the safety and outcome of the biopsy. Hemoglobin (choice C) is important for assessing oxygen-carrying capacity but is not directly related to the kidney biopsy procedure. Serum potassium (choice A) is important to monitor in CKD but is not specifically crucial before a renal biopsy. White blood cell count (choice D) is more relevant for assessing infection or inflammation, which is not the primary concern before a renal biopsy.

Correct Answer: B

Rationale: The correct answer is B. A serum potassium level of 6.5 mEq/L is dangerously high and should be reported before hemodialysis to prevent cardiac complications. High potassium levels can lead to life-threatening arrhythmias. Serum creatinine (Choice A) is elevated in renal dysfunction but not the most critical value to report before hemodialysis. Serum calcium (Choice C) and serum bicarbonate (Choice D) levels are within normal limits and are not immediate concerns before hemodialysis.

Correct Answer: C

Rationale: A serum osmolarity of 320 mOsm/kg is the most concerning finding in a client with hyperglycemic hyperosmolar syndrome (HHS). This level of osmolarity indicates severe dehydration and hyperosmolarity, putting the client at risk of complications like organ failure. Immediate intervention is crucial to address the dehydration and restore fluid balance. The other options, while important in the overall assessment of a client with HHS, do not directly indicate the severity of dehydration and hyperosmolarity seen with a high serum osmolarity level.