The client with pernicious anemia asks why vitamin B12 injections are necessary. What is the best response by the nurse?
Vitamin B12 contributes to the increased production of RBCs after significant blood loss.
Vitamin B12 is needed to prevent excessive production of red blood cells.
Vitamin B12 is needed to prevent RBCs from sticking together.
Your stomach does not provide a substance necessary for the absorption of vitamin B12.
The Correct Answer is D
Choice A reason: Vitamin B12 does not contribute to the increased production of RBCs after significant blood loss. Vitamin B12 is a type of vitamin that is essential for the normal formation and maturation of red blood cells (RBCs), which carry oxygen throughout the body. ¹ However, vitamin B12 does not increase the production of RBCs in response to blood loss. That is the role of erythropoietin, a hormone that stimulates the bone marrow to produce more RBCs. ²
Choice B reason: Vitamin B12 is not needed to prevent excessive production of red blood cells. Vitamin B12 is needed for the normal production of red blood cells, not for the prevention of overproduction. Excessive production of red blood cells, also known as polycythemia, can cause the blood to become thick and viscous, increasing the risk of clotting and stroke. ³ Polycythemia can be caused by various factors, such as smoking, dehydration, or genetic mutations, but not by a lack of vitamin B12.
Choice C reason: Vitamin B12 is not needed to prevent RBCs from sticking together. Vitamin B12 is needed for the normal formation and maturation of RBCs, not for the prevention of aggregation. RBCs can stick together and form clumps, also known as rouleaux, which can impair blood flow and oxygen delivery. Rouleaux can be caused by various factors, such as inflammation, infection, or cancer, but not by a lack of vitamin B12.
Choice D reason: Vitamin B12 is needed for the normal formation and maturation of RBCs, but it cannot be absorbed by the body without a substance called intrinsic factor. Intrinsic factor is a protein that is produced by the stomach and binds to vitamin B12, allowing it to be absorbed by the small intestine. ¹ Pernicious anemia is a type of anemia that occurs when the stomach does not produce enough intrinsic factor, leading to vitamin B12 deficiency. The only way to treat pernicious anemia is by giving vitamin B12 injections, which bypass the need for intrinsic factor.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
Choice A reason: Glucose of 110 mg/dL is not a finding that indicates digoxin toxicity. It is a normal blood glucose level for a fasting or non-fasting client.
Choice B reason: Potassium of 3.0 mEq/L is a finding that indicates digoxin toxicity. It is a low serum potassium level, which increases the risk of digoxin toxicity by enhancing the binding of digoxin to cardiac cells. The nurse should monitor the client for signs and symptoms of digoxin toxicity, such as nausea, vomiting, anorexia, fatigue, confusion, visual disturbances, and cardiac arrhythmias.
Choice C reason: Calcium of 9.0 mg/dL is not a finding that indicates digoxin toxicity. It is a normal serum calcium level for an adult client.
Choice D reason: Sodium of 133 mEq/L is not a finding that indicates digoxin toxicity. It is a slightly low serum sodium level, which may indicate hyponatremia, but not digoxin toxicity.
Correct Answer is B
Explanation
Choice A reason: This is incorrect. Walking directly in front of the client may block their view and increase their risk of falling. The nurse should walk to the side and slightly behind the client to provide support and guidance³.
Choice B reason: This is correct. Walking along the affected left side allows the nurse to assist the client with balance, weight shifting, and foot clearance. The nurse should also encourage the client to use the handrail on their strong side³.
Choice C reason: This is incorrect. Walking directly behind the client may not allow the nurse to see the client's gait pattern or intervene quickly if the client loses balance. The nurse should walk to the side and slightly behind the client to monitor and assist them³.
Choice D reason: This is incorrect. Walking along the unaffected right side may not provide adequate support or protection for the client's affected side. The nurse should walk along the affected left side to help the client with their hemiplegic gait³.
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