A client in severe pulmonary edema is being intubated by the resident. What action by the nurse will assist in the confirmation of the endotracheal tube placement in the proper position?

Choice A reason: Observing mist in the endotracheal tube suggests air movement but is not a reliable indicator of correct placement. Mist can occur with esophageal intubation or partial airway placement. Definitive confirmation requires imaging, as mist does not distinguish between tracheal and esophageal placement, risking ventilation errors. Choice B reason: A chest x-ray is the gold standard for confirming endotracheal tube placement. It visualizes the tube’s position relative to the carina, ensuring it is in the trachea and not the esophagus or a main bronchus. This is critical in pulmonary edema to ensure effective ventilation and oxygenation. Choice C reason: Attaching a pulse oximeter monitors oxygen saturation but does not confirm endotracheal tube placement. Improved saturation may occur with incorrect placement (e.g., esophageal), and low saturation does not specify tube position. Imaging is required for definitive confirmation, making pulse oximetry a supportive, not primary, measure. Choice D reason: Checking the pH of secretions is not a standard method for confirming endotracheal tube placement. Secretions’ pH varies and does not indicate whether the tube is in the trachea or esophagus. Chest x-ray provides anatomical confirmation, essential for ensuring proper ventilation in critical conditions like pulmonary edema.