For gout negatively birefringent crystals, the long axis of the crystal appears yellow when parallel to the slow axis of the compensator and blue when perpendicular. Pathophysiology and Uric Acid Metabolism The presence of gout negatively birefringent crystals in joints triggers a potent inflammatory cascade.
Gout Negatively Birefringent vs Pseudogout: Avoiding Misdiagnosis
The procedure involves aspirating joint effusion, placing a drop of fluid on a slide, and examining it under polarized light to confirm the presence of negatively birefringent needles. Synovial fluid examination provides immediate, objective evidence of crystal presence.
Understanding Birefringence in Crystallography Birefringence is an optical phenomenon occurring in anisotropic materials, where the velocity of light varies depending on the polarization and propagation direction within the crystal lattice. Monosodium urate crystals are phagocytosed by neutrophils, leading to the activation of the NLRP3 inflammasome.
Gout Negatively Birefringent vs. Pseudogout: Avoiding Misdiagnosis
They are often intracellular, found within neutrophils, which is a key feature supporting the diagnosis. This results in the maturation and release of interleukin-1β (IL-1β), a key pro-inflammatory cytokine responsible for the intense pain, swelling, and redness characteristic of an acute gout attack.
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