Electrocardiographic values in Spanish-bred horses of different ages.

The study examines the variations in electrocardiograph wave forms and intervals in Spanish-bred horses over a range of ages, highlighting a link between age and changing heart performance as well as comparing these findings to other breeds.

Study Methods and Materials

• This research was carried out on 179 Andalusian horses, an indigenous Spanish breed, aged between 1 month and 17 years.
• The main tool of measurement was an electrocardiograph, used to capture and analyze the duration of the heart’s electrical waveforms and intervals. This gave an insight into heart health and functionality.
• The study also incorporated a comparative analysis of the electrocardiographic values of Andalusian horses to those of other breeds, broadening its context and utility.

Studies Findings

• The study found significant correlation coefficients between the intervals of the electrocardiographic PR, ST and QT (parts of the electrical heart cycle) and the age of the horses. In simpler terms, as the horses aged, measurable changes occurred in their heart functions as reflected in these specific intervals.
• An ‘inverted relation’ was discovered between heart rate and age, meaning that as the horses got older, their heart rates tended to decrease.
• The analysis also revealed significant changes in duration values and heart rate specifically at the age of 6 months and again in the second year of life. This perhaps suggests these are critical stages in a horse’s development, at least in terms of cardiac health. It potentially implicates further factors such as growth rate, hormonal changes, and physiological maturation.

Study Implications

• The findings of this study add to our understanding of heart function dynamics in horses as they grow and age, offering valuable insights into equine health and physiology.
• With heart disease a common cause of morbidity and mortality in horses, this data could be particularly useful in early detection and preventative care strategies.
• Being able to compare these trends to other breeds enables a more comprehensive understanding of breed-specific health risks, potentially contributing to better breed-specific care and management practices.
• Identifying specific life stages where significant changes occur could guide veterinary attention at these critical times, supporting better overall horse health and longevity.