Nokea
What is cardiac power output (CPO) in a patient with acute anterior wall ST-elevation myocardial infarction and left ventricular failure? His mean arterial pressure was 60 mm Hg and cardiac output calculated on echo was 2.91l min−1.
- A. 0.48
- B. 0.38
- C. 0.58
- D. 0.68
Correct Answer: C
Rationale: Cardiac power output is calculated as (MAP × cardiac output) / 451. For the given values, the correct calculation gives a value of 0.58.
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Which high level labs should the nurse explain can prevent cardiovascular disease?
- A. Cholesterol
- B. Triglycerides
- C. Low-density lipoproteins (LDLs)
- D. High-density lipoproteins (HDLs)
Correct Answer: D
Rationale: HDLs contain very low concentrations of triglycerides, relatively little cholesterol, and high levels of proteins. It is thought that HDLs protect against cardiovascular disease. Cholesterol, triglycerides, and LDLs are not protective against cardiovascular disease.
The following are true statements:
- A. Tissue plasminogen activator is derived from endothelium
- B. Heparin acts through antithrombin III
- C. Protein C deficiency is autosomal recessive transmitted
- D. Protein C is vitamin K dependent
Correct Answer: B
Rationale: Heparin acts through antithrombin III: Heparin enhances the activity of antithrombin III, which inhibits thrombin and other clotting factors, helping prevent clot formation.
How would the nurse caring for an infant with congestive heart failure (CHF) modify feeding techniques to adapt for the child's weakness and fatigue? (Select all that apply.)
- A. Feeding more frequently with smaller feedings
- B. Using a soft nipple with enlarged holes
- C. Holding and cuddling the child during feeding
- D. Substituting glucose water for formula
Correct Answer: A
Rationale: Infants with CHF fatigue easily. Feeding can be given more frequently in smaller amounts through a soft, large-holed nipple. Formulas with a denser caloric content can be offered. The child may be encouraged to nurse if he or she is held.
A chest radiograph film is ordered for a child with suspected cardiac problems. The child’s parent asks the nurse, “What will the radiograph show about the heart?†What knowledge about the x-ray should the nurse include in the response to the parents?
- A. Bones of chest but not the heart
- B. Measurement of electrical potential generated from heart muscle
- C. Permanent record of heart size and configuration
- D. Computerized image of heart vessels and tissues
Correct Answer: C
Rationale: A chest radiograph will provide information on the heart size and pulmonary blood-flow patterns. It will provide a baseline for future comparisons. The heart will be visible, as well as the sternum and ribs. Electrocardiography (ECG) measures the electrical potential generated from heart muscle. Echocardiography will produce a computerized image of the heart vessels and tissues by using sound waves.
Which of the following statements is true regarding alcohol septal ablation?
- A. Indicated when dynamic LV outflow gradient is more than 50 mm Hg at rest
- B. Targeted septal thickness less than 16 mm is a contraindication
- C. Usually preferred over surgical myomectomy
- D. Reduces risk of sudden death
Correct Answer: A
Rationale: Alcohol septal ablation is indicated when the dynamic LV outflow gradient is more than 50 mm Hg at rest.