Blood biochemical response to sodium bicarbonate infusion during sublethal endotoxemia in ponies.

The research studied the impact of sodium bicarbonate infusion on ponies enduring sublethal endotoxemia. Despite noticing some positive effects such as blood volume expansion and delayed onset of hypophosphatemia, the overall results pointed towards more harmful effects, suggesting the need for reassessing the use of sodium bicarbonate in treating equine endotoxemia.

Study Setup

• The researchers conducted a test on ponies experiencing endotoxemia, a state where harmful endotoxins are present in the blood, usually as a result of bacteria infection or other diseases. The endotoxemia in this experiment was of a sublethal degree, indicating that it was not sufficient to cause death.
• The ponies were given an infusion of hypertonic NaHCO3 (sodium bicarbonate). The researchers observed and recorded the effects to find out how the ponies’ blood biochemistry would react.

Findings

• Positive consequences of the sodium bicarbonate infusion involved blood volume expansion and a delay in the onset of hypophosphatemia, which is a lower-than-normal amount of phosphate in the blood.
• However, the infusion did not achieve blood pH normalization. The pH value of blood indicates its acidity or alkalinity. A normal pH is crucial for the body’s cells to function properly. This raised concerns about the effectiveness of sodium bicarbonate as a treatment for endotoxemia.
• On the negative side, the infusion caused hypokalemia, a condition characterized by low levels of potassium in the blood. It also led to hypernatremia, a high concentration of sodium in the blood, and hyperosmolality, an elevated osmolality or concentration of a solution. Furthermore, the infusion increased the blood concentration of L-lactate, a result often linked to tissue hypoxia, shock, and tissue injury.
• When weighing up these mixed results, the researchers concluded that the detrimental effects of the sodium bicarbonate infusion on the ponies surpassed the benefits.

Implications of the Study

• The results of this research urge a reassessment of the use of intravenous hypertonic NaHCO3 as a therapy for equine endotoxemia.
• If the high risk of negative impacts associated with this treatment is confirmed in further studies, new methods will need to be introduced and tested for treating endotoxemia in horses and other equids.