Correct Answer: B

Rationale: The correct answer is B. First, reviewing lab results for potassium level is important in assessing potential electrolyte imbalances that may contribute to the patient's symptoms. This allows for a comprehensive understanding of the patient's condition. Assessing the patient for other symptoms or problems is crucial to gather additional information. Finally, notifying the healthcare provider ensures timely communication and collaboration for appropriate care. Choice A is incorrect as following a clinical protocol for a stroke is premature without a comprehensive assessment. Choice C is incorrect as administering medication without a thorough assessment and provider notification can be dangerous. Choice D is incorrect as notifying the healthcare provider should precede administering any medication.

Correct Answer: A

Rationale: The correct answer is A because evaluating a nursing intervention involves collecting data to determine if the goals set for the intervention were achieved. This process helps in assessing the effectiveness of the intervention in meeting the desired outcomes. Option B is incorrect as it refers to the identification of nursing diagnoses for new problems, which is part of the nursing assessment phase, not evaluation. Option C is incorrect as adjusting the care plan to include collaborative interventions is part of the implementation phase, not evaluation. Option D is incorrect as performing client care tasks as per protocol is part of the implementation phase, not evaluation.

Correct Answer: D

Rationale: The correct answer is D: Strengthens heart contraction. Digoxin is an inotropic agent that works by increasing the force of the heart's contractions. This leads to improved cardiac output and helps manage conditions like heart failure. Choices A, B, and C are incorrect because digoxin does not decrease heart rate, increase conduction time, or increase heart rate. It specifically targets the strength of the heart's contractions, making option D the most appropriate choice. This action of digoxin is crucial in improving the efficiency of the heart's pumping function.

Correct Answer: A

Rationale: Step 1: Vitamin B12 is absorbed in the small intestine with the help of intrinsic factor produced by parietal cells in the stomach. Step 2: Intrinsic factor binds to vitamin B12, forming a complex that is then absorbed in the ileum. Step 3: If intrinsic factor is lacking (as seen in pernicious anemia), vitamin B12 absorption is impaired, leading to megaloblastic anemia. Step 4: Administering cyanocobalamin bypasses the need for intrinsic factor. Step 5: Thus, intrinsic factor influences Vitamin B12 absorption. Other choices (B, C, D) do not play a direct role in Vitamin B12 absorption.

Correct Answer: B

Rationale: The correct answer is B because air conduction is less efficient than bone conduction due to the sound waves traveling through the air in the ear canal, which can be hindered by factors like blockages or obstructions. This results in a weaker and less clear sound transmission compared to bone conduction, where sound waves are transmitted directly through the bones of the skull, bypassing any potential obstructions in the ear canal. Incorrect choices: A: This statement is incorrect as air conduction of sound in the ear is not caused by the vibration of bones in the skull. C: This statement is incorrect as air conduction is typically heard for a shorter duration than bone conduction. D: This statement is incorrect as air conduction of sound in the ear is not caused by the transmission of heat through the air, but rather by sound waves traveling through the ear canal.