The critical care nurse and the other members of the care team are assessing the patient to see if he is ready to be weaned from the ventilator. What are the most important predictors of successful weaning that the nurse should identify?

Stable vital signs and ABGS

Pulse oximetry above 80% and stable vital signs

Stable nutritional status and ABGS

Normal orientation and level of consciousness

Answer and Explanation

The Correct Answer is A

Rationale:
A. Stable vital signs and ABGs is correct. Successful weaning from mechanical ventilation depends on the patient’s ability to maintain adequate gas exchange and hemodynamic stability. Stable vital signs (heart rate, blood pressure, respiratory rate) indicate cardiovascular stability, and normal arterial blood gases (ABGs) demonstrate that the patient can maintain sufficient oxygenation (PaO₂) and ventilation (PaCO₂) without assistance. These are the most reliable physiological predictors of successful weaning.

B. Pulse oximetry above 80% and stable vital signs is incorrect because a PaO₂ corresponding to an SpO₂ of 80% indicates significant hypoxemia. Successful weaning generally requires adequate oxygenation (SpO₂ typically ≥90% on minimal oxygen support) to ensure tissue oxygen delivery. Stable vital signs alone are not sufficient if oxygenation is inadequate.

C. Stable nutritional status and ABGs is incorrect because while good nutrition supports overall recovery and respiratory muscle strength, it is not an immediate predictor for weaning readiness. ABGs are important, but nutritional status alone does not determine ventilator independence.

D. Normal orientation and level of consciousness is incorrect because cognitive status is supportive but not the primary determinant of weaning success. Patients can be sedated or temporarily altered in consciousness and still be physiologically ready if vital signs and ABGs are stable. Cognitive ability mainly affects cooperation during weaning trials rather than physiological readiness.

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Correct Answer is C

Explanation

Rationale:

A. Flat positioning increases the risk of aspiration, which can lead to ventilator-associated pneumonia (VAP). Evidence-based guidelines recommend elevating the head of the bed to 30–45 degrees to reduce aspiration risk.

B. While turning the patient helps prevent pressure injuries and promotes circulation, there is no strong evidence that turning alone significantly reduces the risk of VAP. Frequent repositioning is beneficial but not the primary preventive measure for pneumonia.

C. Oral hygiene is a key intervention to prevent ventilator-associated pneumonia. The endotracheal tube bypasses normal airway defenses, allowing colonization of oral bacteria that can be aspirated into the lungs. Brushing the teeth and oral care with suctioning removes dental plaque and secretions, reducing bacterial load and the risk of VAP. Best practice is to perform oral care every 12 hours or more frequently.

D. Humidification is essential for airway comfort and secretion management, but it does not prevent bacterial colonization or VAP. While necessary for patient care, it is not a primary preventive measure against ventilator-associated pneumonia.

A. Hypotension B. Severe dyspnea C. Decreased level of consciousness D. Nausea E. Headache

Correct Answer is ["B","C","E"]

Explanation

Rationale:

A. Hypotension is not a primary or classic manifestation of acute respiratory failure. While blood pressure changes can occur in severe or late stages due to hypoxia or acidosis, it is not a hallmark finding of acute respiratory compromise. In early respiratory failure, the body typically compensates with sympathetic stimulation, which more commonly causes tachycardia and sometimes hypertension rather than hypotension.

B. One of the earliest and most prominent manifestations of acute respiratory failure is severe shortness of breath. The client may exhibit tachypnea, use of accessory muscles, nasal flaring, and visible distress. Acute respiratory failure occurs when the lungs cannot adequately oxygenate blood (PaO₂ < 60 mm Hg) and/or remove carbon dioxide (PaCO₂ > 50 mm Hg), leading to significant respiratory distress.

C. As hypoxemia worsens or carbon dioxide levels rise (hypercapnia), cerebral oxygen delivery decreases and carbon dioxide acts as a central nervous system depressant. This can result in restlessness, confusion, lethargy, and eventually decreased level of consciousness. Altered mental status is a critical and late sign of worsening respiratory failure and requires immediate intervention.

D. Nausea is not a typical manifestation of acute respiratory failure. Although severe hypoxia can affect multiple organ systems, nausea is more commonly associated with gastrointestinal disorders, medication effects, or metabolic disturbances rather than primary respiratory failure.

E. Headache is commonly associated with hypercapnia (elevated carbon dioxide levels). Increased PaCO₂ causes cerebral vasodilation, which can lead to increased intracranial pressure and headache. Morning headaches are especially common in patients with chronic CO₂ retention, but acute elevations can also produce this symptom.

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The critical care nurse and the other members of the care team are assessing the patient to see if he is ready to be weaned from the ventilator. What are the most important predictors of successful weaning that the nurse should identify?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

A nurse is caring for a client who has an endotracheal tube and is receiving mechanical ventilation. Which of the following actions should the nurse take to reduce the risk of ventilator-associated pneumonia?

Correct Answer is C

Explanation

A nurse is caring for a client who has an acute respiratory failure (ARF). The nurse should monitor the client for which of the following manifestations of this condition? (Select all that apply.)

Correct Answer is ["B","C","E"]

Explanation

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