Correct Answer: A

Rationale: The correct answer is A: Electrocardiogram (ECG). An electrocardiogram should be performed first to assess for cardiac ischemia in a client with a history of myocardial infarction and chest pain. This test provides immediate information about the heart's electrical activity. Choice B, Chest X-ray, is used to visualize the structures of the chest, including the heart and lungs, but it does not directly assess for cardiac ischemia. Choice C, Arterial blood gases (ABGs), measures the oxygen and carbon dioxide levels in the blood and assesses acid-base balance, which is not the primary concern in this scenario. Choice D, Echocardiogram, is an ultrasound of the heart that provides information about the heart's structure and function, but it is not the initial diagnostic test for assessing cardiac ischemia in this situation.

Correct Answer: B

Rationale: In this scenario, the most critical intervention is to obtain a wound swab for culture and sensitivity. This will help identify the causative organism present in the wound, enabling healthcare providers to prescribe the appropriate treatment. Initiating contact isolation (Choice A) may be necessary in certain situations but is not the priority in this case where infection is suspected. Assessing the temperature (Choice C) is important for monitoring the client's condition but does not address the underlying cause. Using alcohol-based solutions for hand hygiene (Choice D) is a standard practice for infection control but does not directly address the client's specific condition of a postoperative wound with evisceration and elevated temperature.

Correct Answer: A

Rationale: The correct action for the nurse to implement next is to collect a clean-catch specimen. This is essential to diagnose the cause of the client's symptoms accurately before initiating any treatment. Administering antibiotics (Choice B) without confirming the diagnosis through a specimen collection can be inappropriate and potentially harmful. Performing a bladder scan (Choice C) may not provide the necessary information to identify the specific cause of the symptoms. Increasing the client's fluid intake (Choice D) is a general recommendation and may not address the underlying issue causing the symptoms.

Correct Answer: A

Rationale: A fetal heart rate of 200 beats per minute is significantly elevated and requires immediate medical attention. This finding could indicate fetal distress, tachycardia, or other serious issues that need prompt evaluation. Mild ankle edema, complaints of back pain, and decreased fetal movements are common in pregnancy but are not as urgent or concerning as a high fetal heart rate.

Correct Answer: A

Rationale: The correct answer is A: Serum potassium. When a client with chronic kidney disease is receiving erythropoietin therapy, monitoring serum potassium closely is essential. Erythropoietin therapy can lead to increased red blood cell production, which may cause potassium levels to rise, potentially resulting in hyperkalemia. Monitoring potassium levels helps prevent complications associated with hyperkalemia. Choices B, C, and D are incorrect because they are not directly impacted by erythropoietin therapy in the context of CKD.