Relationship between plasmatic concentrations of K, Na and Ca, and ECG from foals during postnatal phase

The correlations between different electrocardiographic variables and plasma concentrations of K, Na and Ca ions were studied in foals of 1 to 14 days of age. The results obtained are only significant in neonate individuals of 1 day of age. Whilst the PQ segment and R wave duration showed a positive linear correlation (p less than or equal to 0.05) with plasma concentrations of Na and Ca ions respectively, the amplitude of the T wave showed a negative linear correlation (p less than or equal to 0.05) with the K ion. Moreover, the variability in duration of the QT and ST intervals can be explained by both Na (p less than or equal to 0.01 and p less than or equal to 0.05, respectively) and K (p less than or equal to 0.05 and p less than or equal to 0.01, respectively) plasma concentrations with which they show a positive linear correlation.