A nurse is assessing a client who has been prescribed lactulose for the management of hepatic encephalopathy. Which of the following statements by the client about the effects of lactulose indicates that the nurse must provide further education?

Ventilator-associated pneumonia (VAP) is a hospital-acquired infection that develops in clients receiving mechanical ventilation, typically due to aspiration of oropharyngeal secretions, impaired airway defenses, and colonization of the respiratory tract. Prevention focuses on evidence-based “ventilator bundle” interventions aimed at reducing aspiration risk, maintaining oral hygiene, improving lung expansion, and preventing stress-related complications. Consistent nursing care is essential in reducing morbidity and mortality associated with VAP.

Rationale:
A. Elevating the head of the bed to 30–45 degrees is a key intervention because it reduces the risk of aspiration of gastric and oral secretions into the lungs. This position promotes better lung expansion and decreases reflux, which is a major contributor to ventilator-associated pneumonia. Maintaining this elevation is a standard component of VAP prevention bundles.

B. Conducting frequent repositioning and mobilizing the client as tolerated helps improve lung ventilation, secretion clearance, and overall pulmonary function. Movement prevents atelectasis and reduces bacterial colonization in dependent lung areas. Early mobilization, when safe, is associated with decreased incidence of ventilator-associated complications.

C. Ensuring ventilator settings are adjusted every eight hours exactly is not a VAP prevention strategy. Ventilator settings are adjusted based on clinical assessment, blood gas analysis, and patient response rather than fixed time intervals. Routine arbitrary adjustments do not reduce infection risk and may compromise ventilation if not clinically indicated.

D. Performing regular oral hygiene with mouth rinses and suctioning secretions is crucial in preventing VAP because it reduces bacterial colonization in the oropharynx. Oral care, especially with antiseptic solutions, helps minimize aspiration of infectious organisms into the lower respiratory tract. Suctioning also helps maintain airway patency and reduce secretion buildup.

E. Administering pantoprazole 40 mg IVP daily is included in VAP prevention because it reduces gastric acid secretion and helps prevent stress-related mucosal damage and bleeding. Pantoprazole may reduce the risk of aspiration of acidic gastric contents in critically ill ventilated clients. However, its use is balanced against the potential risk of increasing gastric bacterial colonization, so it is given based on risk assessment.

The arterial blood gas (ABG) results indicate respiratory alkalosis, characterized by a high pH (7.5) and a low PaCO2 (28 mm Hg), while the bicarbonate remains within the normal range. In a client with pneumonia on mechanical ventilation, a respiratory rate of 34 breaths per minute suggests hyperventilation. Respiratory alkalosis occurs when excessive ventilation causes increased elimination of carbon dioxide from the body, leading to a rise in blood pH. In mechanically ventilated clients, this often results from hyperventilation due to excessive ventilator settings or patient distress.

Rationale:
A. Administering an anxiolytic may be helpful if anxiety is contributing to hyperventilation, but in this case the client is on mechanical ventilation, making ventilator settings the more direct and immediate cause to address. Priority should be given to correcting the mechanical source of excessive ventilation first. Sedation without adjusting ventilation may delay proper correction of the alkalosis.

B. Administering sodium bicarbonate is inappropriate because sodium bicarbonate is used to treat metabolic acidosis, not respiratory alkalosis. This client already has an elevated pH of 7.5, indicating alkalemia, and giving bicarbonate would worsen the imbalance. The low PaCO2 confirms that the primary problem is excessive carbon dioxide loss rather than bicarbonate deficiency.

C. Increasing oxygen concentration is not the priority because the ABG findings indicate a ventilation problem rather than an oxygenation problem. The major abnormality is low PaCO2 caused by excessive respiratory rate, not evidence of hypoxemia. Raising oxygen concentration will not correct respiratory alkalosis and may expose the client to unnecessary oxygen-related complications.

D. Decreasing the respiratory rate of the mechanical ventilator is the priority intervention because it directly addresses the cause of respiratory alkalosis. A respiratory rate of 34 breaths per minute causes excessive carbon dioxide elimination, resulting in PaCO2 of 28 mm Hg and elevated pH. Lowering the ventilator rate helps retain carbon dioxide and gradually restores normal acid-base balance.