A client with a history of chronic heart failure is admitted with shortness of breath and crackles in the lungs. Which diagnostic test should the nurse anticipate preparing the client for first?

Correct Answer: C

Rationale: The correct answer is C: Echocardiogram. An echocardiogram should be performed first to assess ventricular function and evaluate the cause of shortness of breath and crackles in a client with heart failure. An echocardiogram provides valuable information about the heart's structure and function, helping to identify potential issues related to heart failure. Chest X-ray (Choice A) may be done to assess for changes in heart size or fluid in the lungs but does not directly assess heart function. Arterial blood gases (Choice B) may provide information about oxygenation but do not directly evaluate heart function. An electrocardiogram (Choice D) assesses the heart's electrical activity but does not provide detailed information about ventricular function, which is crucial in heart failure management.

Correct Answer: B

Rationale: The correct answer is B: Administer intravenous insulin and glucose. In the presence of hyperkalemia, the priority intervention is to shift potassium back into the cells to lower serum levels. Insulin, in combination with glucose, helps drive potassium intracellularly. Administering calcium gluconate (choice A) is used to stabilize myocardial cell membranes but does not address the underlying cause of hyperkalemia. Administering sodium bicarbonate (choice C) is not the initial treatment for hyperkalemia. Loop diuretics (choice D) may be used later to enhance potassium excretion but are not the primary intervention for acute hyperkalemia.

Correct Answer: A

Rationale: The correct answer is A: International Normalized Ratio (INR). The INR should be closely monitored in a client with atrial fibrillation to assess the effectiveness and safety of anticoagulation therapy with warfarin. Monitoring the INR helps to ensure that the client is within the therapeutic range to prevent complications such as thrombosis or bleeding. Choices B, C, and D are less relevant in this scenario. While serum glucose levels are important in assessing metabolic status, and white blood cell count and prothrombin time are important indicators for other conditions, they are not the primary focus when a client with atrial fibrillation presents with confusion.

Correct Answer: C

Rationale: A serum ammonia level of 80 mcg/dl is most concerning in a client with cirrhosis as it may indicate hepatic encephalopathy, requiring immediate intervention. Elevated ammonia levels are associated with impaired liver function and can lead to mental status changes. Serum bilirubin (Choice A) is elevated in cirrhosis but not as concerning for acute intervention as high ammonia levels. Serum albumin (Choice B) and serum sodium (Choice D) levels are important in cirrhotic patients but are not as directly associated with hepatic encephalopathy as ammonia levels.

Correct Answer: B

Rationale: The correct answer is to administer intravenous insulin and glucose first. This intervention helps drive potassium back into the cells, lowering serum levels effectively. Administering intravenous calcium gluconate (choice A) is used to stabilize cardiac membranes in severe hyperkalemia but does not address the underlying cause. Administering intravenous sodium bicarbonate (choice C) is used in metabolic acidosis, not hyperkalemia. Administering a loop diuretic (choice D) can help eliminate potassium but is not the first-line treatment for hyperkalemia in CKD.