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:
- A. Potassium channels open while sodium channels close, causing repolarization to the resting state.
- B. The influx of calcium is the primary stimulus for the repolarization of cardiac tissue.
- C. Only the electrical activity within the heart will determine when repolarization occurs.
- D. The cell membranes need to stay calm, resulting in muscle tissue becoming refractory.
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 nurse is caring for a client with hypertension who asks about a prescription for propranolol. The nurse should inform the client that this medication is contraindicated in clients with a history of which of the following conditions?
- A. Asthma
- B. Glaucoma
- C. Depression
- D. Migraines
Correct answer: A
Rationale: Corrected Rationale: Propranolol is contraindicated in clients with a history of asthma because it can cause bronchospasms due to its non-selective beta-blocking properties. By blocking beta-2 receptors in the lungs, propranolol can lead to bronchoconstriction, potentially triggering asthma symptoms and exacerbating respiratory issues. Asthma patients should avoid medications like propranolol that can worsen their condition. Choices B, C, and D are incorrect as propranolol is not contraindicated in clients with glaucoma, depression, or migraines. In fact, propranolol is sometimes used in the treatment of migraines and certain types of glaucoma.
3. A 12-year-old child is injured in a bicycle accident. When considering the possibility of renal trauma, the nurse should consider what factor?
- A. Flank pain rarely occurs in children with renal injuries.
- B. Few nonpenetrating injuries cause renal trauma in children.
- C. Kidneys are immobile, well protected, and rarely injured in children.
- D. The amount of hematuria is not a reliable indicator of the seriousness of renal injury.
Correct answer: D
Rationale: The amount of hematuria is not a reliable indicator of the severity of renal trauma, as even minor injuries can cause significant bleeding, while severe injuries may result in little or no visible blood. Renal trauma should be evaluated through imaging and clinical assessment.
4. A client scheduled for surgery cannot sign the operative consent form because he has been sedated with opioid analgesics. The nurse should take which best action regarding the informed consent?
- A. Obtain a court order for the surgery
- B. Sign the informed consent on behalf of the client
- C. Send the client to surgery without the consent form being signed
- D. Obtain a telephone consent from a family member, with the consent being witnessed by two healthcare providers
Correct answer: D
Rationale: In situations where a client is unable to sign the consent form, obtaining a telephone consent from a family member witnessed by two healthcare providers is the appropriate action to ensure informed consent is obtained. Option A is not necessary and involves legal proceedings. Option B is not ethical as the nurse cannot sign the consent on behalf of the client. Option C is unsafe and violates the client's rights by proceeding without proper consent.
5. A client is to receive Pamidronate for bone pain related to cancer. What precaution should the nurse take during the administration of Pamidronate?
- A. Inspect the skin for redness and irritation around the injection site.
- B. Assess the IV site for thrombophlebitis frequently during administration.
- C. Instruct the client to lie down for 30 minutes after oral administration.
- D. Monitor for signs of anaphylaxis for 20 minutes after intramuscular injection.
Correct answer: B
Rationale: Pamidronate is typically administered through IV infusion, which can cause irritation to veins. The nurse should frequently assess the IV site for thrombophlebitis during the administration to promptly detect any potential complications related to the infusion. Inspecting the skin for redness and irritation around the injection site (Choice A) is not directly related to IV infusion. Instructing the client to lie down after oral administration (Choice C) is not necessary for IV administration. Monitoring for signs of anaphylaxis after an intramuscular injection (Choice D) is not relevant for an IV infusion of Pamidronate.
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