Which statement best describes the pathophysiology of gout?

Which statement best describes the pathophysiology of gout?

• A. High uric acid in serum
• B. Crystals dissolve quickly
• C. Inflammation without crystal deposition
• D. Deposition of uric acid crystals in joints, soft tissues, and kidneys triggers an inflammatory response

Answer: (D)

Gout is a crystal-induced inflammatory arthritis caused by deposition of monosodium urate crystals in joints and other tissues. When serum urate is elevated, these crystals form and localize in cooler peripheral joints and soft tissues, where they are ingested by neutrophils. This crystal interaction activates inflammatory pathways, notably the NLRP3 inflammasome, leading to release of cytokines such as IL-1 and a robust inflammatory response that produces the painful swelling of an acute attack. Crystals can also deposit in the kidneys, contributing to stones or urate nephropathy over time. Therefore, the best description of the pathophysiology is the deposition of uric acid crystals in joints, soft tissues, and kidneys that triggers an inflammatory response. Hyperuricemia is a risk factor but not by itself the inflammatory process, and statements about crystals dissolving quickly or inflammation without crystals do not fit the mechanism.

Gout is a crystal-induced inflammatory arthritis caused by deposition of monosodium urate crystals in joints and other tissues. When serum urate is elevated, these crystals form and localize in cooler peripheral joints and soft tissues, where they are ingested by neutrophils. This crystal interaction activates inflammatory pathways, notably the NLRP3 inflammasome, leading to release of cytokines such as IL-1 and a robust inflammatory response that produces the painful swelling of an acute attack. Crystals can also deposit in the kidneys, contributing to stones or urate nephropathy over time. Therefore, the best description of the pathophysiology is the deposition of uric acid crystals in joints, soft tissues, and kidneys that triggers an inflammatory response. Hyperuricemia is a risk factor but not by itself the inflammatory process, and statements about crystals dissolving quickly or inflammation without crystals do not fit the mechanism.