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HCO3- 30 mEq/L is incorrect because normal bicarbonate is 22–26 mEq/L. Elevated bicarbonate occurs only in chronic or compensated respiratory acidosis when the kidneys retain HCO3- to buffer excess hydrogen ions. In acute cases, HCO3- is usually normal.

pH 7.45 is incorrect because normal pH is 7.35–7.45, and respiratory acidosis is characterized by a pH below 7.35. A pH of 7.45 is alkalemic and would indicate respiratory alkalosis rather than acidosis.

Potassium 3.3 mEq/L is incorrect because acute respiratory acidosis often causes hyperkalemia due to hydrogen ions shifting into cells in exchange for potassium. Hypokalemia is not characteristic of this condition.

Prepare to administer a sedative is incorrect because the client is already experiencing respiratory alkalosis (pH 7.50, PaCO₂ 29 mm Hg) due to hyperventilation. Although she is tachypneic, sedation could suppress respiratory drive and worsen hypoxemia (PaO₂ 60 mm Hg, SaO₂ 86%). Suppressing respirations in a hypoxic patient can lead to respiratory failure. Sedation does not address the underlying oxygenation problem and could be dangerous at this stage.

Prepare for mechanical ventilation is incorrect because although the client is tachypneic, she is still breathing spontaneously and does not show signs of respiratory failure such as rising PaCO₂, severe fatigue, altered level of consciousness, or inability to maintain airway. Mechanical ventilation is indicated when respiratory effort fails or oxygenation cannot be maintained despite supplemental oxygen. At this stage, less invasive oxygen delivery is the priority.

Assess for indications of pulmonary embolism is incorrect as the priority intervention, although it is clinically very relevant. This client has significant risk factors for pulmonary embolism, including oral contraceptive use and smoking, along with symptoms of sudden dyspnea, pleuritic chest pain, tachycardia, hypoxemia, and respiratory alkalosis — classic findings associated with conditions such as pulmonary embolism described in resources like Pulmonary embolism. However, while further assessment and rapid provider notification are essential, the immediate priority is correcting hypoxemia by administering oxygen. Assessment follows stabilization.

Constant bubbling in the suction-control chamber is incorrect because this is an expected finding when suction is applied. Gentle, continuous bubbling in the suction-control chamber indicates that the prescribed level of suction is being maintained. It reflects normal system function, not a complication.

Occasional bubbling in the water-seal chamber is incorrect because intermittent bubbling can be expected, particularly when the client coughs, sneezes, or exhales deeply. This indicates that air is being removed from the pleural space, which is therapeutic rather than problematic.

Fluctuations in the fluid level in the water-seal chamber is incorrect because this is a normal finding known as tidaling. The fluid level rises during inspiration and falls during expiration (or the opposite if the client is receiving positive-pressure ventilation). Tidaling indicates that the system is patent and functioning properly. Absence of fluctuation may actually indicate obstruction or lung re-expansion.

Disconnect the chest tube from the drainage system during transport is incorrect because the chest tube must remain connected to the closed drainage system at all times. Disconnecting it would allow air to enter the pleural space, potentially causing a pneumothorax or tension pneumothorax. Maintaining a closed system is essential to preserve negative intrapleural pressure and prevent respiratory compromise.

Clamp the chest tube prior to transferring the client to a wheelchair is incorrect because routine clamping of a chest tube is contraindicated. Clamping can trap air in the pleural space and lead to a tension pneumothorax, which is life-threatening. Chest tubes are only clamped briefly for specific provider-ordered procedures, such as changing the drainage system or assessing for air leaks—not for transport.

Empty the collection chamber prior to transport is incorrect because emptying the drainage system is not routinely required before transport and may disrupt the sterile, closed system. Additionally, breaking the system increases infection risk and compromises accurate measurement of output. The drainage system is typically replaced—not emptied—when full, per facility protocol.

Metabolic alkalosis is incorrect because alkalosis would present with an elevated pH (>7.45) and an elevated HCO3⁻. This client has the opposite pattern (low pH and low HCO3⁻).

Respiratory alkalosis is incorrect because respiratory alkalosis would show an elevated pH and a decreased PaCO2 (<35 mm Hg). This client’s pH is low (acidic), and PaCO2 is normal.

Respiratory acidosis is incorrect because respiratory acidosis would show a low pH and an elevated PaCO2 (>45 mm Hg) due to carbon dioxide retention. This client’s PaCO2 is normal, ruling out a primary respiratory cause.

Blockage of the ET tube by the client's tongue is incorrect because the purpose of an endotracheal tube is to bypass the upper airway, including the tongue. The tube is inserted directly into the trachea, so the tongue cannot obstruct airflow once the tube is properly placed.

Passage of the ET tube into the esophagus is incorrect because esophageal intubation would result in absent bilateral breath sounds, abdominal distention, lack of chest rise on both sides, and rapid oxygen desaturation. The finding in this question is unilateral absence of chest expansion, not bilateral.

Infection of the vocal cords is incorrect because vocal cord infection would not cause immediate unilateral absence of chest expansion. It may cause hoarseness or airway discomfort but would not produce this acute and asymmetric respiratory finding.

A small stab wound with a skin blade made into the pleural space is incorrect because creating an open incision is not the standard emergency treatment for a tension pneumothorax. While surgical chest tube placement (thoracostomy) may follow, the immediate life-saving intervention is rapid decompression with a needle. Making a stab wound without proper equipment and sterile technique would be unsafe and inappropriate.

Covering the chest wall wound with gauze is incorrect because this intervention is associated with management of an open pneumothorax (“sucking chest wound”), not a tension pneumothorax. In fact, completely sealing a chest wound without allowing air to escape can worsen pressure buildup and potentially create or exacerbate a tension pneumothorax.

Immediate tracheostomy is incorrect because a tracheostomy establishes an airway but does not relieve pressure trapped in the pleural space. A tension pneumothorax is a problem of trapped intrapleural air compressing the lung and shifting mediastinal structures—not an upper airway obstruction.

pH 7.30; HCO3 22; PCO2 60; PO2 66 is incorrect because this reflects respiratory acidosis (low pH, elevated CO2). In the early stages of a pulmonary embolism, the client typically hyperventilates due to hypoxemia and anxiety, which lowers CO2 rather than increasing it. Elevated CO2 is more consistent with hypoventilation, not acute embolism.

pH 7.38; HCO3 22; PCO2 45; PO2 96 is incorrect because these values are essentially normal. A pulmonary embolism causes impaired perfusion and ventilation-perfusion (V/Q) mismatch, leading to hypoxemia. Normal oxygen levels would not be expected 15 minutes after an acute embolic event.

pH 7.30; HCO3 28; PCO2 65; PO2 75 is incorrect because this reflects respiratory acidosis with metabolic compensation (elevated CO2 and elevated bicarbonate). This pattern would be more consistent with chronic respiratory failure, not the early phase of an acute pulmonary embolism.

Heart rate increases 10 beats/min is incorrect because a mild increase in heart rate during suctioning is a common physiological response due to stimulation of the vagus nerve and stress of the procedure. An increase of 10–20 bpm is usually considered acceptable and does not necessitate stopping the procedure unless accompanied by other severe symptoms.

Respiratory rate increases from 16 to 20 breaths/min is incorrect because a slight increase in respiratory rate is a normal response to suctioning. The client may transiently hyperventilate to compensate for brief airway obstruction during the procedure.

Blood pressure increases from 110/70 to 120/80 mm Hg is incorrect because a minor rise in blood pressure is also a normal physiological response to stimulation and stress during suctioning. This change is mild and does not indicate an adverse event.