What defines the Physiologically Deficient Zone?

The Physiologically Deficient Zone is defined as the altitude range from 10,000 feet to 50,000 feet Mean Sea Level (MSL). Within this zone, the partial pressure of atmospheric oxygen decreases significantly, making it more challenging for the human body to acquire the necessary oxygen for normal physiological functions. At altitudes above 10,000 feet, individuals may begin to experience altitude sickness and hypoxia, particularly without supplemental oxygen. As the altitude increases further, up to 50,000 feet, physiological effects become even more pronounced, necessitating specialized equipment and oxygen systems for safety. Understanding this zone is critical for flight paramedics, as it informs protocol related to patient care and medical interventions in environments where traditional oxygenation may be compromised.