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represent?
- A. Alveolar oxygen tension.
- B. Oxygen that is chemically combined with hemoglobin .
- C. Oxygen that is physically dissolved in plasma.
- D. Total oxygen consumption.
Correct Answer: B
Rationale: The correct answer is B: Oxygen that is chemically combined with hemoglobin. This is because oxygen primarily travels in the blood by binding to hemoglobin in red blood cells, forming oxyhemoglobin. This process allows for efficient transport of oxygen to tissues throughout the body. Choices A, C, and D are incorrect because:
A: Alveolar oxygen tension refers to the partial pressure of oxygen in the alveoli of the lungs, not the specific form of oxygen in the blood.
C: Oxygen physically dissolved in plasma refers to the small amount of oxygen that is not bound to hemoglobin and is less significant in oxygen transport compared to oxygen bound to hemoglobin.
D: Total oxygen consumption is the overall amount of oxygen utilized by the body, not specifically the form of oxygen bound to hemoglobin for transport.
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The nurse is caring for a patient whose ventilator settings i nclude 15 cm H O of positive end-expiratory pressure (PEEP). The nurse understands that although beneficial, PEEP may result in what possible problem?
- A. Fluid overload secondary to decreased venous return.
- B. High cardiac index secondary to more efficient ventric ular function.
- C. Hypoxemia secondary to prolonged positive pressure a t expiration.
- D. Low cardiac output secondary to increased intrathoracic pressure
Correct Answer: D
Rationale: Rationale for Correct Answer (D - Low cardiac output secondary to increased intrathoracic pressure):
1. PEEP increases intrathoracic pressure, which can impede venous return to the heart.
2. Impaired venous return reduces preload, leading to decreased cardiac output.
3. Decreased cardiac output can result in inadequate tissue perfusion and oxygenation.
4. Therefore, PEEP may cause low cardiac output due to increased intrathoracic pressure.
Summary of Incorrect Choices:
A. Fluid overload is not directly related to PEEP but more to fluid administration or kidney function.
B. High cardiac index is unlikely as PEEP can decrease cardiac output.
C. Hypoxemia is not a direct result of PEEP but may occur due to other factors like inadequate ventilation or oxygenation settings.
A patient who is receiving positive pressure ventilation is scheduled for a spontaneous breathing trial (SBT). Which finding by the nurse is most important to discuss with the health care provider before starting the SBT?
- A. New ST segment elevation is noted on the cardiac monitor.
- B. Enteral feedings are being given through an orogastric tube.
- C. Scattered rhonchi are heard when auscultating breath sounds.
- D. HYDROmorphone (Dilaudid) is being used to treat postoperative pain.
Correct Answer: A
Rationale: The correct answer is A: New ST segment elevation is noted on the cardiac monitor. This finding is concerning because it may indicate myocardial ischemia or infarction, which can be exacerbated by the physiological stress of weaning from mechanical ventilation. It is crucial to address any cardiac issues before initiating a spontaneous breathing trial to prevent potential cardiac complications during the weaning process.
Explanation for why the other choices are incorrect:
B: Enteral feedings being given through an orogastric tube are not contraindicated for starting a spontaneous breathing trial.
C: Scattered rhonchi heard when auscultating breath sounds may indicate retained secretions but are not a contraindication for a spontaneous breathing trial.
D: The use of HYDROmorphone to treat postoperative pain is not a contraindication for a spontaneous breathing trial unless it is causing respiratory depression, which would need to be addressed separately.
The nurse is assisting with endotracheal intubation and un derstands correct placement of the endotracheal tube in the trachea would be identified by which of the following? (Select all that apply.)
- A. Auscultation of air over the epigastrium
- B. Equal bilateral breath sounds upon auscultation
- C. Position above the carina verified by chest x-ray
- D. Positive detection of carbon dioxide (CO
Correct Answer: B
Rationale: The correct answer is B: Equal bilateral breath sounds upon auscultation. This indicates proper placement of the endotracheal tube in the trachea, ensuring both lungs are being ventilated equally.
Rationale:
1. Auscultation of air over the epigastrium (Choice A) is incorrect as it indicates esophageal intubation, not tracheal intubation.
2. Position above the carina verified by chest x-ray (Choice C) is incorrect as it does not confirm proper placement at the trachea.
3. Positive detection of carbon dioxide (CO2) (Choice D) is incorrect as it indicates the presence of exhaled CO2, but not necessarily proper placement in the trachea.
The term used to describe an increase in blood urea nitrogen (BUN) and serum creatinine is
- A. oliguria.
- B. azotemia.
- C. acute kidney injury.
- D. prerenal disease.
Correct Answer: B
Rationale: The correct answer is B: azotemia. Azotemia refers to an increase in BUN and serum creatinine levels, indicating impaired kidney function. Oliguria (A) is a decrease in urine output, not specific to BUN and creatinine levels. Acute kidney injury (C) is a broader term encompassing various causes of kidney dysfunction, not specific to elevated BUN and creatinine. Prerenal disease (D) refers to conditions affecting blood flow to the kidneys, not directly related to elevated BUN and creatinine levels.
The client has been in the CCU for several weeks and has been very unstable. One family member stays at the bedside constantly and even naps in a bedside chair. The nurse understands that the family member is exhibiting which family member response to critical illness?
- A. Exhibiting extreme distrust of the health care team
- B. Seeking evidence for future legal or punitive action
- C. Trying to maintain a level of control over the situation
- D. Experiencing extreme fatigue from constant stress
Correct Answer: C
Rationale: The correct answer is C: Trying to maintain a level of control over the situation. The family member staying at the bedside constantly and even napping there is likely trying to cope with the stressful situation by maintaining a sense of control and connection to the patient. This behavior can be a way for the family member to feel more involved and helpful during a time of uncertainty and powerlessness. Choices A and B involve negative assumptions about the family member's intentions without evidence. Choice D may be a result of the family member's actions but does not address the underlying motivation for their behavior.