Nasal Cannula (Figure 9.9)

• 4% increase in FiO₂ concentration per l increase in O₂ flow above room air
• FiO₂ – (0.2 + 0.04 × L/min) (max 0.4)

• Advantages
  • Practical and inexpensive for most head and neck procedures
  • Respiratory/ventilatory function can be assessed by CO₂ scavenging, but CO₂ levels may not be accurate
• Disadvantages
  • Cannot provide positive pressure ventilation
  • Can cause nasal irritation
  • Cannot utilize N₂O due to lack of scavenging
• Ineffective
  • Chronic sinusitis
  • Mouth breathing
  • Deviated septum
  • Choanal atresia

Nasal Hood

• FiO₂ ~ 0.5–0.6 when flow is greater than minute ventilation
• Advantages
  • Inexpensive, practical for most dental procedures
  • Able to titrate N₂
    Only gold members can continue reading. Log In or Register to continue