Decompression sickness is seen in all except
**Core Concept**
Decompression sickness, also known as the "bends," occurs when rapid changes in pressure cause gas bubbles to form in the bloodstream and tissues. This condition is a result of the body's inability to absorb excess gases, such as nitrogen, dissolved in the bloodstream.
**Why the Correct Answer is Right**
Decompression sickness typically occurs in individuals who have undergone rapid changes in pressure, such as scuba diving or flying. The rapid decrease in pressure allows the dissolved gases to form bubbles in the bloodstream and tissues, leading to a range of symptoms, including joint pain, fatigue, and even paralysis or death in severe cases. The pathophysiology involves the formation of gas bubbles in the microvasculature, which can lead to inflammation, tissue damage, and organ dysfunction.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because decompression sickness can occur in individuals who have undergone rapid changes in pressure, regardless of their age.
**Option B:** This option is incorrect because decompression sickness is not limited to individuals who have a history of previous decompression sickness.
**Option C:** This option is incorrect because decompression sickness can occur in individuals who have undergone rapid changes in pressure, regardless of their physical activity level.
**Clinical Pearl / High-Yield Fact**
It's essential to note that the risk of decompression sickness can be reduced by gradual changes in pressure, breathing high concentrations of oxygen, and following established decompression protocols.
**Correct Answer: C. Divers who are physically active have a lower incidence of decompression sickness than those who are less active.**