Intravascular hemolysis associated with severe cutaneous burn injuries in five horses.

This study explores the way severe burn injuries cause red blood cell damage and hemolysis (destruction) in horses, investigating the relationship between these injuries and the release of oxygen radicals. Treatment interventions include rehydration, inflammation control, wound care, pain management and sepsis prevention, with an emphasis on early, aggressive fluid therapy.

Severe Burn Injuries and Intravascular Hemolysis in Horses

• The article investigates the impact of severe burn injuries on five horses that survived a barn fire. Specifically, the research examines the associated intravascular hemolysis, a condition where red blood cells (RBCs) break down and release their internal contents into surrounding plasma.
• The study found observable damage and morphological changes in the RBCs consistent with oxidative damage, which happened in every assessed horse. Oxidative damage is evidence of stress to the cells caused by free radicals or lack of adequate antioxidants.
• In addition to this, four of the examined horses became azotemic – a condition characterised by high levels of nitrogen-containing compounds in the blood, often an indicator of kidney damage or malfunction.

Treatment Goals and Outcome

• The objectives of treatment included taking care of the wounds, restoring hydration, initiating diuresis (increased production of urine), managing inflammation and pain, in addition to prevention against sepsis – a potentially life-threatening complication of infection.
• Despite this treatment, only two horses survived and were discharged from the hospital, indicating the potential severity of burn injuries and their complications in equine populations.

Hemolysis and Oxidative Damage

• The study notes that the process of RBC damage and hemolysis in response to severe burn injuries has been studied in other species and seems to stem from the release of oxygen radicals by complement-activated neutrophils, a type of white blood cell.
• Oxygen radicals are very reactive chemical species that can cause significant cellular damage. The release of these radicals by neutrophils suggests an inflammatory pathogenesis of the hemolysis and RBC damage observed in these burn victims.

Treatment Recommendations

• The study concludes by suggesting early intervention with aggressive fluid therapy as a treatment measure for severely burned humans and horses. This mode of treatment can replenish fluids, restore hydration status and promote diuresis, which can potentially alleviate azotemia and support kidney function.
• The authors also propose the beneficial use of free radical scavengers and xanthine oxidase inhibitors. Free radical scavengers, often in the form of antioxidants, can neutralise damaging oxygen radicals while xanthine oxidase inhibitors can reduce production of these radicals, potentially limiting cellular damage.