When the oxygen concentration drops below _____, the risk of death is near certain unless immediate rescue and recovery operations are conducted

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

An increase in the H+ ion concentration [H+] of the blood due only to an increase in the arterial PCO2 (hypercapnia) best describes which of the following?

a. Metabolic acidosis b. Metabolic alkalosis c. Respiratory acidosis d. Respiratory alkalosis