A nurse is caring for a client admitted to the intensive care unit for a cardiac dysrhythmia. The nurse understands the prescribed calcium channel blocker has which of the following mechanisms of action?

Increases heart rate and increases myocardial contractility

Increase oxygen to the systemic circulation

Reduces the contractility and conductivity of the heart

Acts on the beta cells within the heart and lungs to regulate cardiac rhythm

Answer and Explanation

The Correct Answer is C

A. Calcium channel blockers primarily decrease heart rate and contractility, not increase them.

B. While they can indirectly improve oxygen supply by reducing myocardial oxygen demand, they do not directly increase systemic oxygen.

C. This option accurately describes the mechanism of action of calcium channel blockers, which decrease heart contractility and conduction through the AV node, helping to manage dysrhythmias.

D. Calcium channel blockers do not act on beta cells; they specifically inhibit calcium influx into cardiac and vascular smooth muscle cells.

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Free Nursing Study Resources

Correct Answer is ["675"]

Explanation

To calculate the dosage of vancomycin, we first convert the client's weight from pounds to kilograms, knowing that 1 kilogram is approximately 2.2 pounds. The client weighs 198 pounds, which is equivalent to about 90 kilograms (198 lb / 2.2). The prescribed dose is 15 mg/kg/day, so for a 90 kg individual, this would be 1350 mg/day (15 mg/kg * 90 kg). Since the dose is divided equally every 12 hours, the nurse would administer half of the daily dose every 12 hours, resulting in 675 mg per dose (1350 mg/day / 2). Therefore, the nurse should administer 675 mg of vancomycin with each dose.

A. doxazosin B. carvedilol C. lisinopril D. Clonidine

Correct Answer is C

Explanation

A. Doxazosin is an alpha-1 blocker that can be used for hypertension but is not a first-line option.

B. Carvedilol is a beta-blocker used in heart failure and post-MI but is not the first choice for initial hypertension treatment.

C. Lisinopril, an ACE inhibitor, is widely recognized as a first-line treatment for hypertension due to its effectiveness and favorable side effect profile.

D. Clonidine is generally not considered a first-line treatment for hypertension due to potential side effects and the availability of more effective alternatives.

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A nurse is caring for a client admitted to the intensive care unit for a cardiac dysrhythmia. The nurse understands the prescribed calcium channel blocker has which of the following mechanisms of action?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse prepares to administer vancomycin 15 mg/kg/day divided equally every 12 hr. The client weighs 198 lb. How many mg should the nurse administer with each dose? (Round the answer to the nearest whole number. Use a leading zero if it applies. Do not use a trailing zero.)

Correct Answer is ["675"]

Explanation

The nurse is caring for a client newly diagnosed with hypertension and requires medication therapy. Which of the following medications below is considered a first line treatment for hypertension?

Correct Answer is C

Explanation

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