A nurse is caring for a patient on a mechanical ventilator. Which intervention is most effective in preventing Ventilator-Associated Pneumonia (VAP)?

The correct answer to the question "A nurse is caring for a patient on a mechanical ventilator. Which intervention is most effective in preventing Ventilator-Associated Pneumonia (VAP)?" is Option B: Ensuring the head of the bed is elevated to 30-45 degrees..

The other options — A) Administering prophylactic antibiotics daily., C) Performing endotracheal suctioning every 2 hours., D) Limiting oral hygiene to once per shift. — are incorrect for this NCLEX-RN Exam Prep question. As explained above: Elevating the head of the bed to 30-45 degrees (semi-Fowler's position) helps prevent aspiration of oropharyngeal secretions and gastric contents into the lungs, significantly reducing the risk of VA…