Endotracheal Intubation

A 52-year-old male with a history of oral cancer surgery presents for elective abdominal surgery. The anesthesiologist is deciding between awake fiberoptic nasotracheal intubation and rapid sequence orotracheal intubation. Which finding on preoperative assessment would best favor nasotracheal intubation over orotracheal intubation?

What is the correct distance from the teeth to the optimal position of the endotracheal tube tip in an adult patient during oral intubation?

A 68-year-old male with COPD undergoes elective abdominal surgery under general anesthesia with endotracheal intubation. Post-extubation, he develops stridor and dyspnea within 2 hours. Which is the most common cause of post-extubation stridor in this patient?

Which of the following endotracheal tube sizes is recommended for a 10-year-old child undergoing elective surgery?

A 38-year-old female patient with severe preeclampsia is admitted for emergency cesarean section. During rapid sequence induction, after administration of propofol and succinylcholine, the anesthesiologist notes that bag-mask ventilation is impossible—no chest rise is observed despite multiple attempts with different mask sizes and head positioning. Oxygen saturation drops from 98% to 78% within 60 seconds. What is the most appropriate immediate action?