Traditional and quantitative assessment of acid-base and shock variables in horses with atypical myopathy.

This research focuses on describing and comparing abnormalities and cardiovascular shock conditions in horses affected by atypical myopathy (AM) using traditional and quantitative acid-base assessments. It concludes that horses with AM typically show respiratory and metabolic acid-base deviations, and recommends the strong ion model for accurate assessment of such disturbances.

Objective and Methods in the Research

• The study aimed to identify typical acid-base and shock-induced symptoms in horses affected by atypical myopathy (AM) at admission.
• Data for the research were gathered retrospectively from the clinical records of 34 horses with AM and 15 healthy horses used as controls.
• The researchers looked for shock variables such as heart and respiratory rates, blood urea nitrogen (BUN), and packed cell volume (PCV) in the records.
• Acid-base variables such as electrolytes, total protein, lactate, and venous blood gas analysis results were also collected for analysis.

Calculation and Comparison of Acid-Base and Shock Variables

• The researchers calculated values for various metrics such as Base Excess (BE) of free water, chloride, total protein, unidentified anions, anion gap, and concentration of total non-volatile weak acids. They used these along with measured strong ion difference (SIDm) to evaluate the acid-base status of the horses.
• Acid-base classifications and shock grades were assigned to each horse.
• A statistical comparison of the variables was done between AM-afflicted horses and control horses, with the resulting significant differences indicating the typical characteristics associated with AM.

Results and Conclusion of the Research

• The results demonstrated that conditions such as tachycardia, tachypnea, and normal to increased levels of PCV and BUN were prevalent in horses with AM.
• Abnormalities in the acid-base balance were found to be mainly a result of two factors: respiratory alkalosis and lactic acidosis.
• Variables linked to these conditions, with the exception of pH, potassium concentration, total protein, and related calculations, showed significant differences between the afflicted and control horses.
• Finally, the study concluded that the strong ion model was superior to traditional methods in assessing mixed acid-base disturbances in horses with AM and should be preferred in future evaluations.