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During a patients care conference, the team is discussing whether the patient is a candidate for cardiac conduction surgery. What would be the most important criterion for a patient to have this surgery?
- A. Angina pectoris not responsive to other treatments
- B. Decreased activity tolerance related to decreased cardiac output
- C. Atrial and ventricular tachycardias not responsive to other treatments
- D. Ventricular fibrillation not responsive to other treatments
Correct Answer: C
Rationale: Cardiac conduction surgery is considered in patients who do not respond to medications and antitachycardia pacing. Angina, reduced activity tolerance, and ventricular fibrillation are not criteria.
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During a CPR class, a participant asks about the difference between cardioversion and defibrillation. What would be the instructors best response?
- A. Cardioversion is done on a beating heart; defibrillation is not.
- B. The difference is the timing of the delivery of the electric current.
- C. Defibrillation is synchronized with the electrical activity of the heart, but cardioversion is not.
- D. Cardioversion is always attempted before defibrillation because it has fewer risks.
Correct Answer: B
Rationale: One major difference between cardioversion and defibrillation is the timing of the delivery of electrical current. In cardioversion, the delivery of the electrical current is synchronized with the patients electrical events; in defibrillation, the delivery of the current is immediate and unsynchronized. Both can be done on a beating heart (i.e., in a dysrhythmia). Cardioversion is not necessarily attempted first.
The staff educator is teaching a CPR class. Which of the following aspects of defibrillation should the educator stress to the class?
- A. Apply the paddles directly to the patients skin.
- B. Use a conducting medium between the paddles and the skin.
- C. Always use a petroleum-based gel between the paddles and the skin.
- D. Any available liquid can be used between the paddles and the skin.
Correct Answer: B
Rationale: Use multifunction conductor pads or paddles with a conducting medium between the paddles and the skin (the conducting medium is available as a sheet, gel, or paste). Do not use gels or pastes with poor electrical conductivity.
The nurse is caring for a patient who has had an ECG. The nurse notes that leads I, II, and III differ from one another on the cardiac rhythm strip. How should the nurse best respond?
- A. Recognize that the view of the electrical current changes in relation to the lead placement.
- B. Recognize that the electrophysiological conduction of the heart differs with lead placement.
- C. Inform the technician that the ECG equipment has malfunctioned.
- D. Inform the physician that the patient is experiencing a new onset of dysrhythmia.
Correct Answer: A
Rationale: Each lead offers a different reference point to view the electrical activity of the heart. The lead displays the configuration of electrical activity of the heart. Differences between leads are not necessarily attributable to equipment malfunction or dysrhythmias.
A patient has returned to the cardiac care unit after having a permanent pacemaker implantation. For which potential complication should the nurse most closely assess this patient?
- A. Chest pain
- B. Bleeding at the implantation site
- C. Malignant hyperthermia
- D. Bradycardia
Correct Answer: B
Rationale: Bleeding, hematomas, local infections, perforation of the myocardium, and tachycardia are complications of pacemaker implantations. The nurse should monitor for chest pain and bradycardia, but bleeding is a more common immediate complication. Malignant hyperthermia is unlikely because it is a response to anesthesia administration.
A nurse is providing health education to a patient scheduled for cryoablation therapy. The nurse should describe what aspect of this treatment?
- A. Peeling away the area of endocardium responsible for the dysrhythmia
- B. Using electrical shocks directly to the endocardium to eliminate the source of dysrhythmia
- C. Using high-frequency sound waves to eliminate the source of dysrhythmia
- D. Using a cooled probe to eliminate the source of dysrhythmia
Correct Answer: D
Rationale: Cryoablation therapy involves using a cooled probe to create a small scar on the endocardium to eliminate the source of the dysrhythmias. Endocardium resection involves peeling away a specified area of the endocardium. Electrical ablation involves using shocks to eliminate the area causing the dysrhythmias. Radio frequency ablation uses high-frequency sound waves to destroy the area causing the dysrhythmias.