What are the four types of Decompression Sickness (DCS)?

The correct answer identifies the four recognized types of Decompression Sickness (DCS): Bends, CNS (Central Nervous System), Chokes, and Creeps.

The Bends, medically known as decompression sickness Type I, occurs when nitrogen bubbles form in the body due to a rapid decrease in pressure, leading to joint pain and other symptoms. CNS DCS, or Type II, occurs when nitrogen affects the central nervous system, potentially resulting in severe neurological symptoms. Chokes refer to Type I symptoms affecting the lungs, which can lead to serious respiratory issues and can be life-threatening. Creeps, while less commonly mentioned, describe mild symptoms like rashes or itching that may indicate the presence of nitrogen bubbles in tissues, often a precursor to more severe forms of DCS.

Understanding the classifications of DCS is crucial for pilots and aircrew, as it directly influences safety protocols and the management of altitude-related risks during flight.