Gout Flashcards
Gout?
Crystal deposits of uric acid in the joints
Is gout autoimmune?
NO
What is the crystal-induced joint damaged caused by?
the inflammation that follows NOT d/t the deposits
uric acid?
nitrogenous waste product usually produced in the liver and excreted by the kidney
Primary form?
- 95% in men
- D/t a metabolic problem (altered metabolism leading to elevated levels of uric acid as a byproduct)
Secondary form?
- renal disorders [where uric acid is not excreted and is retained]
- any condition leading to excessive cell turnover (cellular destruction and formation)
- alcohol (beer elevates purine content In the body which is a source of uric acid)
- chemotherapy
Name the nitrogenous bases and what they are joined by?
- Purines and pyrimidines joined by hydrogen bonds
Purines?
Adenine and guanine
Pyrimidine?
cytosine & thymine & uracil
Patho?
Altered purine metabolism -> results in asymptomatic hyperuricemia -> uric acid deposits as crystals within synovial joints -> an attempt to remove the abnormal accumulation by leukocytes causes damage (leukocytes migrate into joints) -> Polymorphonuclear (PMN) leukocytes -> “many shaped nuclei” -> follow the uric acid crystals into the joint and attempt to remove them. complement activation d/t WBC influx. -> PMN leukocytes engulf debris and foreign material in an attempt to remove the crystals, however, they are toxic to the PMN leukocytes and induce necrosis -> cells die and release their contents -> Lysosomal enzymes released from the WBC’s (from lysosomes within the cells) -> causes enzymatic damage to cartilage -> exposes subchondral bone -> bone-to-bone contact -> erosion of bone. -> inflammation causes non-specific damage -> Tophi
Hyperuricemia?
high levels of uric acid in the blood
Tophi?
hard; solid, space-occupying lesions formed within the joint upon recurrent acute attacks
List the stages of Gout
- Hyperuricemia -> (ASYMPTOMATIC) -> no obvious manifestations
- Acute inflammation in 1 joint
- Acute inflammation subsides within a week
- pt is asymptomatic for months - years
- frequent recurrent attacks -> gradually more and more joints become affected which results in permanent damage
Which joint is most commonly affected?
swollen, painful big tow joint in the late night/early morning (most commonly at this joint, but it may occur in others.
What are some precipitating events that may cause acute inflammation in 1 joint?
- Hearty meal d/t protein breakdown releasing amino acids and uric acid as a byproduct
- strenuous activity d/t diminished glucose stores and utilization of protein for energy
- alcohol binge esp. beer d/t increase purine metabolism and more uric acid as a byproduct
- drugs