The nurse is aware that the goal of using diltiazem 30 mg PO bid in the collaborative plan of care for a client diagnosed with variant (Prinzmetal's) angina is to:

Increase the SA to AV node conduction time

Decrease coronary artery spasm

Diltiazem causes hyperexcitability in the myocardium

Increase the heart rate

Answer and Explanation

The Correct Answer is B

Choice A reason: Increasing the SA to AV node conduction time is not the goal of using diltiazem for variant angina. Diltiazem is a calcium channel blocker that slows down the conduction of electrical impulses in the heart, but this is not the main mechanism of action for relieving variant angina. Variant angina is caused by spasms of the coronary arteries that reduce blood flow to the heart muscle.

Choice B reason: This is the correct answer. Decreasing coronary artery spasm is the goal of using diltiazem for variant angina. Diltiazem relaxes the smooth muscle of the coronary arteries and prevents them from contracting. This improves the blood supply to the heart and reduces the pain and ischemia associated with variant angina.

Choice C reason: Diltiazem does not cause hyperexcitability in the myocardium. This is a false statement. Diltiazem has the opposite effect of reducing the contractility and excitability of the heart muscle. This lowers the oxygen demand of the heart and helps prevent anginal attacks.

Choice D reason: Increasing the heart rate is not the goal of using diltiazem for variant angina. Diltiazem actually decreases the heart rate by blocking the calcium channels in the sinoatrial node and the atrioventricular node. This reduces the workload of the heart and the oxygen consumption. A high heart rate can worsen angina by increasing the oxygen demand of the heart.

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Correct Answer is A

Explanation

Choice A reason: This is the correct answer. Tremors and twitching are signs of hypomagnesemia, which is a low level of magnesium in the blood. Magnesium is a mineral that is involved in many enzymatic reactions and neuromuscular functions. A low magnesium level can cause hyperexcitability of the nerves and muscles, leading to involuntary movements and spasms. Alcoholism can cause hypomagnesemia by reducing the absorption and increasing the excretion of magnesium.

Choice B reason: Positive Chvostek's sign is not a sign of hypomagnesemia, but of hypocalcemia, which is a low level of calcium in the blood. Calcium is another mineral that is important for the function of nerves and muscles. A low calcium level can cause tetany, which is a condition of sustained muscle contraction. Chvostek's sign is a test that involves tapping the facial nerve in front of the ear and observing for a twitching of the facial muscles. A positive Chvostek's sign indicates hypocalcemia, not hypomagnesemia.

Choice C reason: Decreased deep tendon reflexes are not a sign of hypomagnesemia, but of hypermagnesemia, which is a high level of magnesium in the blood. A high magnesium level can cause hyporeflexia, which is a reduced or absent response to stimuli. Magnesium has a sedative effect on the nerves and muscles, and can inhibit the transmission of impulses. Hypermagnesemia can be caused by excessive intake or impaired excretion of magnesium.

Choice D reason: Polyuria and flank pain are not signs of hypomagnesemia, but of kidney problems, such as infection, stones, or failure. Polyuria is the production of abnormally large amounts of urine, and flank pain is the pain in the side or back below the ribs. These symptoms can indicate damage or inflammation of the kidneys, which can affect the balance of fluids and electrolytes in the body. Hypomagnesemia does not directly cause polyuria or flank pain, but it can be a result of kidney dysfunction.

A. International normalized ratio 1.3 seconds B. Hemoglobin 14 g/dL C. Serum iron 150 mcg/dL D. Platelet count 250,000/mm3

Correct Answer is B

Explanation

Choice A reason: The international normalized ratio (INR) is a measure of the blood's ability to clot. It is not affected by ferrous sulfate therapy, which is used to treat iron deficiency anemia. The normal range of INR is 0.8 to 1.2 seconds.

Choice B reason: Hemoglobin is the protein in red blood cells that carries oxygen. It is the main indicator of anemia and the response to iron therapy. The normal range of hemoglobin for adults is 12 to 18 g/dL. A hemoglobin level of 14 g/dL suggests that the patient's anemia has improved with ferrous sulfate therapy.

Choice C reason: Serum iron is the amount of iron in the blood. It is not a reliable indicator of anemia or iron therapy, as it can fluctuate with dietary intake, infection, inflammation, and other factors. The normal range of serum iron for adults is 50 to 170 mcg/dL.

Choice D reason: Platelet count is the number of platelets in the blood. Platelets are involved in blood clotting and wound healing. They are not affected by ferrous sulfate therapy, which is used to treat iron deficiency anemia. The normal range of platelet count for adults is 150,000 to 450,000/mm3.

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The nurse is aware that the goal of using diltiazem 30 mg PO bid in the collaborative plan of care for a client diagnosed with variant (Prinzmetal's) angina is to:

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Naxlex Comprehensive Predictor Exams

A client with alcoholism is admitted to a medical-surgical unit with a serum magnesium level of 0.9 mEq/L. Which clinical manifestations would the nurse expect to find in this client?

Correct Answer is A

Explanation

A patient has recently started ferrous sulfate 500 mg by mouth two times per day for anemia. Which of the following data would indicate to the nurse that the therapy is successful?

Correct Answer is B

Explanation

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The nurse should monitor the client for clinical manifestations of digoxin toxicity if the laboratory report reflects a serum:

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