Which group is at greatest risk of hypoxemia during air transport at cabin altitude?

Which group is at greatest risk of hypoxemia during air transport at cabin altitude?

• A. Athletes
• B. Healthy young adults
• C. Patients with cardiopulmonary disease
• D. Children under 5

Answer: (C)

When you fly, the cabin is pressurized to roughly the equivalent of 8,000 feet altitude, which lowers the amount of oxygen available in the air we breathe. Oxygen delivery to tissues depends on how well the lungs exchange gas, how much oxygen hemoglobin can carry, and how effectively the heart and lungs can increase delivery when demand rises. People with cardiopulmonary disease already have limited gas exchange, reduced reserve, or impaired ability to boost ventilation and cardiac output. Put simply, they have less cushion to tolerate the drop in inspired oxygen, so they’re most prone to developing hypoxemia during air transport. Healthy individuals, including athletes and healthy young adults, typically have enough reserve to compensate for the small reduction in oxygen tension and maintain adequate oxygen delivery. Children under five are indeed more vulnerable due to higher metabolic demands and immature physiology, but the presence of chronic cardiopulmonary disease generally poses a greater risk of meaningful hypoxemia in the cabin environment.

When you fly, the cabin is pressurized to roughly the equivalent of 8,000 feet altitude, which lowers the amount of oxygen available in the air we breathe. Oxygen delivery to tissues depends on how well the lungs exchange gas, how much oxygen hemoglobin can carry, and how effectively the heart and lungs can increase delivery when demand rises. People with cardiopulmonary disease already have limited gas exchange, reduced reserve, or impaired ability to boost ventilation and cardiac output. Put simply, they have less cushion to tolerate the drop in inspired oxygen, so they’re most prone to developing hypoxemia during air transport.

Healthy individuals, including athletes and healthy young adults, typically have enough reserve to compensate for the small reduction in oxygen tension and maintain adequate oxygen delivery. Children under five are indeed more vulnerable due to higher metabolic demands and immature physiology, but the presence of chronic cardiopulmonary disease generally poses a greater risk of meaningful hypoxemia in the cabin environment.