Nokea
The nurse is caring for a patient who is being treated for heart failure. Which of the following laboratory results should the nurse assess to determine the effects of therapy?
- A. Myoglobin
- B. Homocysteine (Hcy)
- C. Low-density lipoprotein (LDL)
- D. B-type natriuretic peptide (BNP)
Correct Answer: D
Rationale: Increased levels of BNP are a marker for heart failure. The other laboratory results would be used to assess for myocardial infarction (myoglobin) or risk for coronary artery disease (Hcy and LDL).
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The nurse is reviewing the 12-lead electrocardiogram (ECG) of a healthy older-adult patient who is having an annual physical examination. Which of the following findings should be of most concern to the nurse?
- A. The heart rate is 43 beats/minute.
- B. The PR interval is 0.21 seconds.
- C. There is a right bundle-branch block.
- D. The QRS duration is 0.13 seconds.
Correct Answer: A
Rationale: The resting supine HR is not markedly affected with aging, so the decrease in HR requires further investigation. Bundle-branch block and slight increases in PR interval or QRS duration are common in older individuals because of increases in conduction time through the AV node, the bundle of His, and the bundle branches.
A transesophageal echocardiogram (TEE) is ordered for a patient with possible endocarditis. Which of the following actions included in the standard TEE orders should the nurse accomplish first?
- A. Administer O2 per mask.
- B. Start a large-gauge IV line.
- C. Place the patient on NPO status.
- D. Give lorazepam 1 mg IV.
Correct Answer: C
Rationale: The patient will need to be NPO for 6 hours preceding the TEE, so the nurse should place the patient on NPO status as soon as the order is received. The other actions also will need to be accomplished but not until just before or during the procedure.
Which of the following information obtained by the nurse who is admitting the patient for magnetic resonance imaging (MRI) will be most important to report to the health care provider before the MRI?
- A. The patient has an allergy to shellfish and iodine.
- B. The patient has a history of coronary artery disease.
- C. The patient has a permanent ventricular pacemaker in place.
- D. The patient took all the prescribed cardiac medications today.
Correct Answer: C
Rationale: MRI is contraindicated for patients with implanted metallic devices such as pacemakers as the magnets can alter the function of the device. The other information also will be reported to the health care provider but does not impact whether or not the patient can have an MRI.
The nurse is assessing the laboratory results for a patient who developed chest pain 4 hours ago and may be having a myocardial infarction. Which of the following laboratory results is most important for the nurse to review?
- A. LDL cholesterol
- B. Troponins T and I
- C. C-reactive protein
- D. Creatine kinase-MB (CK-MB)
Correct Answer: B
Rationale: Cardiac troponins start to elevate hours (average 4-6 hours) after myocardial injury and are specific to myocardium. Creatine kinase-MB (CK-MB) is specific to myocardial injury and infarction, but it does not increase until 6 hours after the infarction occurs. LDL cholesterol and C-reactive protein are useful in assessing cardiovascular risk but are not helpful in determining whether a patient is having an acute myocardial infarction.
The nurse is assessing a patient who was admitted with heart failure and notes that the patient has jugular venous distension (JVD) when lying flat in bed. Which of the following actions should the nurse take next?
- A. Use a ruler to measure the level of the JVD.
- B. Document this finding in the patient's record.
- C. Observe for JVD with the head at 45 degrees.
- D. Have the patient perform the Valsalva manoeuvre.
Correct Answer: C
Rationale: When the patient is lying flat, the jugular veins are at the level of the right atrium, so JVD is a common (but not clinically significant) finding. JVD that persists when the patient is sitting at a 45-degree angle or greater is significant. The nurse may use a ruler to determine the level of JVD above the heart if the JVD persists when the patient is at a 45-degree angle or more. JVD is an expected finding when a patient performs the Valsalva manoeuvre because right atrial pressure increases. The nurse will document the JVD in the record if it persists when the head is elevated.