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Difficulty: HardReduction of Risk Potential

A nurse is caring for a client with acute respiratory distress syndrome (ARDS) who is orally intubated and receiving mechanical ventilation. The ventilator is set with a fraction of inspired oxygen (FiO2FiO_2) of 0.60 and a positive end-expiratory pressure (PEEP) of 12 cm H2OH_2O. The most recent arterial blood gas (ABG) analysis indicates a pHpH of 7.28, PaCO2PaCO_2 of 58 mm Hg, HCO3−HCO_3^- of 26 mEq/L, and PaO2PaO_2 of 52 mm Hg. Suddenly, the client becomes severely agitated, begins "bucking" the ventilator, and the high-peak pressure alarm sounds continuously. To reduce the immediate risk of barotrauma and physiological decompensation, which of the following actions should the nurse perform first?

  1. A
    Administer a prescribed intravenous sodium bicarbonate bolus to correct the acute metabolic acidosis.
  2. B
    Reposition the client to a flat, supine position to maximize cerebral perfusion and calm the client.
  3. Administer the prescribed intravenous sedative to promote ventilator synchrony and reduce oxygen demand.Answer
  4. D
    Perform a complete sequence of physical assessment, starting from the neurological system to the abdomen, to identify the etiology of agitation.

Answer

The priority action is to administer a prescribed intravenous sedative to promote ventilator synchrony and reduce oxygen demand.
The client is experiencing ventilator asynchrony ('bucking'), which dramatically increases intrathoracic pressure and the risk of barotrauma, especially with a high PEEP of 12 cm H2OH_2O. The ABG reveals uncompensated respiratory acidosis with severe hypoxemia. The immediate priority is to administer a prescribed sedative to calm the client, synchronize their breathing with the ventilator, and decrease systemic oxygen consumption, thereby mitigating the risk of pneumothorax and further physiological decline.

Step-by-Step Solution

1
Analyze the clinical presentation and ventilator data.
The client is 'bucking' the ventilator with a high PEEP (12 cm H2OH_2O), creating dangerously high intrathoracic pressure that triggers the high-peak pressure alarm.
Identifying the immediate mechanical threat is necessary to prevent severe barotrauma such as a tension pneumothorax.
2
Interpret the arterial blood gas (ABG) values.
The pHpH is 7.28 (acidosis), PaCO2PaCO_2 is 58 mm Hg (respiratory acidosis), and HCO3−HCO_3^- is 26 mEq/L (normal). This indicates uncompensated respiratory acidosis with severe hypoxemia (PaO2PaO_2 52 mm Hg).
Accurate ABG interpretation rules out metabolic causes and confirms the respiratory failure is worsening due to inadequate ventilation.
3
Select the priority intervention that mitigates the highest risk.
Administering a sedative will calm the client, stop the 'bucking', allow the ventilator to deliver the prescribed tidal volumes, and decrease systemic oxygen consumption.
In the ABCs (Airway, Breathing, Circulation), restoring effective mechanical ventilation (Breathing) is the immediate life-saving priority over routine assessments or contraindicated positioning.

Key Concept

In mechanically ventilated clients with ARDS and high PEEP, sudden agitation and ventilator asynchrony ('bucking') pose an immediate risk for life-threatening barotrauma. Priority risk reduction involves securing synchrony, typically via sedation, rather than delaying care for sequential assessments or misinterpreting ABG data.
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Reduction of Risk Potential

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