Determination of body water compartments in neonatal foals by use of indicator dilution techniques and multifrequency bioelectrical impedance analysis.

The research study examined the total body water, extracellular and intracellular fluid volumes, and plasma volume in newborn foals, using various indicator techniques and multi-frequency bioelectrical impedance analysis. The findings indicated significantly larger fluid volumes in young foals compared to adult horses.

Research Methods and Objectives

The primary goal of the research was to identify the values of total body water (TBW), extracellular fluid volume (ECFV), intracellular fluid volume (ICFV), and plasma volume (PV) in healthy neonatal foals (less than 24 hours old). Additionally, the study aimed to develop a model using multifrequency bioelectrical impedance analysis (MF-BIA), specifically applicable to neonatal foals.

The researchers used two types of methods for the study:

• The primary method involved administering deuterium oxide, sodium bromide, and Evans blue dye to seven healthy neonatal foals. Deuterium oxide helps in determining TBW, sodium bromide is used for calculating ECFV, and Evans blue dye is used for measuring PV.
• The secondary method involved creating an MF-BIA model, using measurements taken from each foal. This method consists of passing a small electric current through the body and measuring resistance to the flow of the current. Different body tissues, coming under the indicator filings, resist the electric current differently, allowing for the estimation of total body water.

Results of the Research

After executing the methods mentioned above, the research team calculated the TBW, ECFV, ICFV, and PV for each foal. The mean values for TBW, ICFV, ECFV, and PV were obtanied. These values can be interpreted as the average volume of the respective fluids per kilogram of body weight for the foals.

Conclusions Drawn

This study concluded that the neonatal foals had significantly larger fluid volumes compared to adult horses, indicating potential differences in hydration and fluid exchange requirements between these two groups. The comparison between MF-BIA and indicator dilution techniques highlighted that these methods shared a high correlation for TBW and ECFV measurement. Thus, it was established that the multifrequency bioelectrical impedance analysis could be a useful predictive technique for TBW, ECFV, and ICFV in neonatal foals. This tool could be beneficial for veterinarians, helping them support the health of neonatal foals.