Blood pressure, electrocardiogram and echocardiogram measurements in the growing pony foal.

The research study investigated the cardiovascular development of twelve newborn pony foals by conducting regular examinations from birth up to 90 days old. Findings confirmed that the foal’s arterial blood pressure increases rapidly within the first month, alongside decreases in resting heart rate observed over two and three months.

Methodology

• The research focused on twelve newborn pony foals which went under rigorous cardiovascular examinations.
• These examinations included auscultation, arterial blood pressure measurements, electrocardiograms, and M-mode echocardiograms. They were regularly conducted from birth up to 90 days old.

Key Findings

• There was a significant, rapid increase in the arterial blood pressure of the pony foals within the first month, which is dependent on their age.
• There was also a noticeable decrease in the resting heart rate after two and three months of life.
• In some of the foals, innocent soft systolic murmurs were audible over the left heart base.
• The PR, QRS, and QT intervals in the electrocardiograms showed an increasing trend as they got older.
• Additionally, there was an observed trend where the mean electrical axis in the frontal plane began to rotate towards the left side.
• The right and left ventricular internal dimensions, which were measured by M-mode echocardiography, increased along with the foals’ growth.
• Linear regression equations were drawn up to represent the relationship of these internal dimensions with the body weight of the foals. The other echocardiographic parameters showed low correlations with their body weight.

Implications of the Study

• The research sheds light on how cardiovascular development progresses in pony foals, offering a more detailed understanding of the physiological changes in blood pressure and heart rate over time.
• The findings could provide a reference for veterinarians or researchers conducting further studies to characterize a normal or abnormal cardiovascular condition in pony foals especially within the first three months of their lives.
• Understanding the relation of ventricular dimensions to body weight and the trend of rotation in the mean electrical axis improves the comprehension of the growth dynamics and heart capacities in younger pony foals.