Key result
Age significantly affected the Q-wave and QRS main vector in healthy Andalusian horses, with 1-month-old animals showing a predominantly negative QRS complex compared to older animals.
Cross-Sectional (n=173)
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This study provides standard electrocardiographic values for the Andalusian horse at different ages, demonstrating age-related changes in the QRS complex likely due to changes in heart size and position during growth.
Configuration and amplitude values of the QRS complex of the electrocardiogram were studied with standard Einthoven leads in 173 healthy Spanish-bred (Andalusian) horses, aged between 1 month and 17 years. Animals which were 1 month old had a predominantly negative QRS complex, whereas a predominantly positive complex direction was found in the rest of the animals. Statistically significant variations were found for the Q-wave and QRS main vector between the different age groups, with highest values for the Q-wave and most negative values for the direction of the QRS main vector in animals up to 2 months of age. The effect of age on the form and amplitude values of the QRS complex could be related to the changes in size and position of the heart in the thorax during growth. This study provides standard electrocardiographic values for the Andalusian horse at different ages.
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Ayala et al. (1998) conducted a cross-sectional in Healthy (n=173). Age vs. Different age groups was evaluated on Configuration and amplitude values of the QRS complex. Age significantly affected the Q-wave and QRS main vector in healthy Andalusian horses, with 1-month-old animals showing a predominantly negative QRS complex compared to older animals.
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