Gout
Gout in reptiles and birds results from the accumulation of uric acid crystals in joints (articular gout) or internal organs (visceral gout). Unlike mammals that excrete urea, reptiles and birds excrete nitrogenous waste as uric acid. When kidney function is compromised or uric acid production exceeds excretion capacity, crystals deposit in tissues causing inflammation and organ damage.
Symptoms & Signs
- Articular: swollen joints, white deposits visible through skin, lameness, reluctance to move
- Visceral: lethargy, loss of appetite, weight loss, sudden death
- Birds: shifting leg lameness, swollen feet
Causes & Risk Factors
Dehydration (most common in reptiles), high-protein diet, renal disease, chronic kidney damage from aminoglycoside antibiotics, inadequate water intake, improper temperatures (affecting kidney function), and vitamin A deficiency (affects renal tubular function).
Diagnosis
Articular: aspiration of joint swelling revealing uric acid crystals (chalky white material). Visceral: elevated uric acid levels, radiographs showing mineralization. Post-mortem: white crystal deposits on organ surfaces. Blood uric acid levels (often elevated only in advanced disease).
Treatment
Aggressive fluid therapy to flush uric acid. Allopurinol to reduce uric acid production. Colchicine for acute attacks. Pain management. Correct underlying husbandry issues. Articular: joint aspiration. Visceral gout has limited treatment options.
Prevention
Adequate hydration (proper humidity, water availability, regular soaking for reptiles). Appropriate protein levels in diet. Proper temperatures for kidney function. Avoid nephrotoxic medications. Regular health monitoring.
Prognosis
Articular gout: fair with early treatment and husbandry correction. Visceral gout: poor, often indicates advanced kidney disease. Prevention is far more effective than treatment.