Correct Answer: B

Rationale: Flat T waves are a characteristic ECG finding in hypokalemia. Hypokalemia causes a decrease in serum potassium levels, leading to altered cardiac conduction. Flat T waves are associated with hypokalemia-induced cardiac dysrhythmias. Elevated ST segments are typically seen in conditions like myocardial infarction, not in hypokalemia. Bradycardia is not a typical manifestation of hypokalemia; instead, tachycardia may occur due to potassium imbalances affecting the heart's electrical activity.

Correct Answer: A

Rationale: The correct answer is to monitor daily weight. Daily weight monitoring is crucial in assessing fluid balance in patients with heart failure because sudden weight gain can indicate fluid retention. Monitoring input and output (choice B) is important but may not provide a complete picture of fluid balance. Checking for edema (choice C) is a sign of fluid accumulation but may not be as accurate as daily weight monitoring. Monitoring blood pressure (choice D) is important in heart failure management but does not directly assess fluid balance.

Correct Answer: A

Rationale: The appropriate nursing action for a patient experiencing an acute allergic reaction is to administer antihistamines. Antihistamines work by blocking the action of histamine, a chemical released during an allergic reaction, and can help relieve symptoms such as itching, swelling, and hives. Corticosteroids are used for severe allergic reactions not responding to antihistamines, as they have anti-inflammatory properties. Oxygen is administered in cases of respiratory distress, while bronchodilators are used for bronchospasms. However, the first-line intervention for an acute allergic reaction is antihistamines.

Correct Answer: A

Rationale: The correct answer is to monitor INR for a patient on warfarin therapy. INR monitoring is crucial as it helps assess the therapeutic effectiveness and safety of warfarin. INR stands for International Normalized Ratio, and it measures the blood's ability to clot. Monitoring potassium levels (Choice B) is not specific to warfarin therapy. Monitoring platelet count (Choice C) is important but not the primary lab value for assessing warfarin therapy. Monitoring sodium levels (Choice D) is not directly related to warfarin therapy.

Correct Answer: B

Rationale: The most appropriate intervention for a patient with a suspected stroke is to perform a CT scan. A CT scan is crucial for diagnosing a stroke by visualizing any bleeding or blockages in the brain. Administering IV fluids (Choice A) may be necessary based on the patient's condition, but it is not the primary intervention for a suspected stroke. Performing a lumbar puncture (Choice C) is not indicated for stroke evaluation and may not provide relevant information. Administering anticoagulants (Choice D) is a treatment option for certain types of strokes but should be based on the CT scan results and specific guidelines.