What are the potential complications of nasal intubation?

Complications of Nasal Intubation

Nasal intubation carries significant risks including epistaxis, increased mortality in certain trauma populations, sinusitis, nasal ala necrosis, and bacteremia, with complications increasing proportionally to intubation duration. For long-term airway management needs (≥4-6 weeks), percutaneous tubes should be used instead of nasal tubes to reduce mechanical complications 1.

Immediate Procedural Complications

Hemorrhagic Complications

• Epistaxis is the most common complication of nasotracheal intubation, occurring due to damage to Kiesselbach's plexus in the anterior nasal septum where branches from ophthalmic, maxillary, and facial arteries anastomose 2
• Bleeding ranges from mild to severe, with severe hemorrhage documented in approximately 10% of cases 3
• Mild to moderate bleeding occurred in 21% (15/71) of patients, while moderate to severe complications including severe bleeding occurred in 10% (7/71) 3
• Nasal cavity bleeding was documented in 19% of ICU patients during intubation 4

Traumatic Injuries

• Fractures of the nasal conchae occur in 11% of patients 4
• Retropharyngeal perforation is a more common complication than previously recognized, occurring when the tube lumen abuts the pharyngeal mucosa after passing the turbinates 3
• Inflammatory changes and ulceration of the nostrils occur in 20% of patients 4
• Ulceration of the nasal septum develops in 29% of patients 4

Life-Threatening Complications

Mortality Risk

• In trauma patients, nasal intubation is associated with increased in-hospital mortality (OR 1.28,95% CI 1.01-1.64) compared to oral intubation 5
• This mortality risk is particularly pronounced in:
  • Elderly patients (age ≥75 years) 5
  • Patients with severe head injury (AIS in head ≥4) 5
  • Normotensive patients (systolic BP ≥90 mmHg) 5
• Notably, mortality was comparable between routes in patients with complicated facial injury (AIS in face ≥3) 5

Pulmonary Complications

• Noninfectious pulmonary complications are significantly increased with nasal intubation (OR 1.48,95% CI 1.14-1.94) 5
• General intubation complications include severe hypoxemia, severe collapse, cardiac arrest, and death in 20-50% of ICU cases 6

Infectious Complications

Sinusitis and Bacteremia

• Risk of sinusitis is a significant disadvantage of nasotracheal intubation, with mucosal edema potentially affecting the maxillary sinus opening 2
• Bacteremia occurs due to abrasion of nasal mucosa during tube insertion 2
• Bacterial carriage into the trachea from nasal contamination is a documented risk 2
• Prior treatment of nostrils with mupirocin can reduce bacterial complications 2

Late Sequelae (Long-term Complications)

Nasal and Sinus Problems

• At 1-2 year follow-up, 35% of patients had persistent nasal symptoms 4
• 24% experienced ear-related symptoms 4
• 20% had maxillary sinus symptoms 4
• Former ulcerations of the nose were associated with tendency to nasal bleeding 4

Laryngeal Complications

• Hoarseness was noted in 42% of patients during intubation 4
• At follow-up, 29% had voice-related symptoms and 32% had throat symptoms 4
• Duration of intubation correlates with persisting laryngeal symptoms 4
• Inflammatory changes and ulcerations correlate directly with intubation duration 4

Soft Tissue Necrosis

• Superficial necrosis of the nasal ala is a common complication 2
• This is particularly problematic in pediatric patients where the naris does not provide enough space for preventive measures 2

Risk Mitigation Strategies

Technical Considerations

• Insert the tracheal tube with the bevel tip toward the lateral side of the naris to avoid Kiesselbach's plexus 2
• If bleeding occurs during insertion, complete the intubation to protect the airway and tamponade the bleeding point 2
• Remove nasal debris from the tube tip by pulling it through the mouth with Magill forceps before advancing into the larynx 2

Duration-Related Recommendations

• Consider orotracheal intubation to avoid nasal and nasal cavity complications 4
• For prolonged intubation needs, earlier tracheostomy should be considered given that late laryngeal sequelae increase with intubation duration 4
• Percutaneous tubes demonstrate lower intervention failure rates (blocking, leakage, treatment non-adherence) compared to nasogastric tubes for long-term needs 1

Pediatric Considerations

In neonates and infants undergoing cardiac surgery, nasal intubation demonstrated:

• Lower postoperative fentanyl consumption (0.53 ± 0.48 vs 0.82 ± 0.20 µg/kg/h, p<0.001) 7
• Lower heart rate increase during intubation (18 ± 5 vs 26 ± 7 beats/min, p<0.001) 7
• Zero incidence of inadvertent intraoperative extubation compared to 6.1% with oral intubation (p=0.029) 7
• Earlier extubation (median 14 vs 20.5 hours, p<0.05) 7
• No increased risk of postoperative pneumonia or surgical wound infection 7

However, pediatric patients face unique challenges with nasal ala necrosis prevention due to limited naris space 2.