Effect of acute acidemia on blood biochemical variables in healthy ponies.

This research was conducted to investigate the effects of acute acidemia, a high level of acidity in the body’s fluids, on the blood chemistry in healthy ponies. Specifically, the impact various infusions – L-lactic acid, D,L-lactic acid, hydrochloric acid, and saline – have on the blood’s biochemical variables like anion gap (AG), plasma potassium (K+), and serum inorganic phosphate levels.

Understanding the Research Method

The researchers introduced different types of infusions to the healthy ponies:

• L-lactic acid and D,L-lactic acid infusion, which resulted in metabolic acidosis
• Hydrochloric acid (HCl) infusion, which also caused metabolic acidosis but with a decreased AG
• Saline (NaCl) infusion, causing a mild metabolic acidosis with no significant change in AG

Each of these approaches was used to stimulate different biochemical responses and to identify any corresponding changes in the blood’s biochemical attributes.

Key Findings of the Study

Primary findings from the experiments include:

• The L-Lactic acid and D,L-lactic acid infusions boosted the AG, which directly corresponded to increased blood L- and D-lactate concentrations in the ponies.
• Hydrochloric acid also resulted in metabolic acidosis but decreased the AG.
• Saline (NaCl) infusion induced mild metabolic acidosis with no significant change in AG.
• All types of infusions resulted in a decrease in plasma potassium (K+) concentration.
• Among the infusions, only hydrochloric acid demonstrated a slight tendency to increase plasma potassium (K+).
• Infusions of saline and hydrochloric acid led to hypophosphatemia, a low level of phosphate in the blood, but it did not develop in ponies infused with D,L-lactic acid.
• In L-lactic acid-infused ponies, the serum inorganic phosphate concentration initially increased but was significantly lower than in the other ponies at 4 hours after onset of infusion.

Interpretation of the Findings

The study found that the nature of the acid anion infused had a direct effect on plasma potassium (K+) and serum inorganic phosphate concentrations, thereby impacting the body’s acidity level. The findings were consistent with what is reported for other species, indicating a universal pattern of biochemical response across different animal species.

Despite the observable changes, the alterations were usually small in magnitude. This finding indicates that major changes in plasma potassium (K+) and serum inorganic phosphate concentrations during acidosis are probably not a direct result of acidemia, suggesting other contributing factors or triggers need to be identified and studied further.