Which of the following is a key factor for ensuring successful intubation?

Ensuring appropriate ET tube placement is essential for successful intubation because it directly affects the patient's ability to breathe effectively. Proper placement means that the endotracheal tube is inserted into the trachea, ensuring that oxygen can be delivered to the lungs and carbon dioxide can be expelled. Incorrect placement can lead to significant complications, such as hypoxia, aspiration, or damage to the trachea and surrounding structures.

Additionally, achieving proper placement typically involves using visualization techniques or capnography to confirm that the tube is in the correct airway position. Proper training and skill also contribute to the success of the procedure, emphasizing the importance of technique over other factors, such as urgency or the use of force. Overall, the primary goal of intubation is to secure the airway, and this is accomplished through ensuring that the ET tube is placed accurately.