Which of the following are advantages of nasal cannula use? 1. They are cost-effective. 2. They deliver precise FIO2. 3. The patient can eat, speak, and drink with the cannula in place. 4. Pressure necrosis will not occur

a. 1 and 2 c. 2 and 3
b. 1 and 3 d. 3 and 4

ANS: B
Nasal cannulas are inexpensive and allow the patient to eat, drink, and speak while receiving ox-ygen. Nasal cannulas cannot deliver precise oxygen concentrations, and pressure necrosis is pos-sible because of the pressure points where the tubing holds the cannula in place touch the pa-tient's face and ears.