when educating a client about to undergo a pacemaker insertion the nurse explains the normal phases of cardiac muscle tissue during the repolarization
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Nursing Elites

ATI RN

Pathophysiology Exam 1 Quizlet

1. When educating a client about to undergo a pacemaker insertion, the nurse explains the normal phases of cardiac muscle tissue. During the repolarization phase, the nurse will stress that membranes must be repolarized before they can be re-excited. Within the cell, the nurse understands that:

Correct answer: A

Rationale: During the repolarization phase of cardiac muscle tissue, potassium channels open while sodium channels close. This process is crucial for the cardiac muscle to return to its resting state after depolarization. Potassium moving out of the cell and sodium staying out helps reset the membrane potential and prepare the cell for the next depolarization phase. The influx of calcium is not the primary stimulus for repolarization in cardiac tissue; it is mainly involved in the depolarization phase. While electrical activity within the heart influences repolarization, the specific ion movements described in choice A are what physiologically drive repolarization. Cell membranes need to be in an active state during repolarization, not calm, to facilitate the necessary ion movements for muscle tissue to properly function.

2. A patient is being educated about sildenafil (Viagra). Which of the following statements by the patient indicates that further teaching is necessary?

Correct answer: A

Rationale: The correct answer is A because sildenafil should not be taken with medications containing nitrates, such as nitroglycerin, due to the risk of severe hypotension. Choice B is incorrect because priapism (prolonged erection) is a serious side effect but does not require immediate intervention like severe hypotension. Choice C is incorrect as it correctly identifies a contraindication for sildenafil use. Choice D is incorrect because not all over-the-counter medications are safe to take with sildenafil, and interactions can occur.

3. A patient began antiretroviral therapy several weeks ago for the treatment of HIV, and he has now presented to the clinic for a scheduled follow-up appointment. He states to the nurse, “I've been pretty good about taking all my pills on time, though it was a bit hit and miss over the holiday weekend.” How should the nurse best respond to this patient's statement?

Correct answer: C

Rationale: The correct response is to remind the patient that antiretroviral drugs are most effective when taken consistently and as prescribed. Choice A is incorrect because taking a double dose after missing a dose is not recommended, as it can lead to medication toxicity. Choice B is incorrect as it may give the impression that missing doses is acceptable, which can reduce the effectiveness of the treatment. Choice D is incorrect because while consistency is important, the focus should be on treatment effectiveness rather than side effects.

4. A healthcare provider is explaining to a patient the difference between primary and secondary immunodeficiency disorders and explains that secondary immunodeficiencies (select ONE that does not apply):

Correct answer: B

Rationale: The correct statements about secondary immunodeficiencies are that they may develop after viral infections, following immunosuppressive therapies, and are caused by superimposed conditions. Choice B ('Develop before birth') is incorrect because secondary immunodeficiencies do not develop before birth. They are acquired later in life. Therefore, the correct answers are A, C, and D.

5. A patient has been prescribed sildenafil (Viagra) for erectile dysfunction. What important information should the healthcare provider provide?

Correct answer: D

Rationale: The correct answer is D. Sildenafil (Viagra) should not be taken with nitrates due to the risk of severe hypotension. Nitrates can potentiate the hypotensive effects of sildenafil, leading to a dangerous drop in blood pressure. Choice A is incorrect because sudden hearing loss is a rare but serious side effect associated with sildenafil, not a common side effect. Choice B is not the most important information related to sildenafil use. While it is generally recommended not to exceed one dose per day, the interaction with nitrates is more critical. Choice C is also important to consider as high-fat meals can delay the onset of action of sildenafil, but it is not as crucial as avoiding nitrates.

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