Spatial vector changes during ventricular depolarisation using a semi-orthogonal lead system--a study of 190 cases.

Area of Science:

• Veterinary Cardiology
• Cardiac Electrophysiology

Background:

• Ventricular depolarization is crucial for cardiac function.
• Understanding spatial vector changes provides insights into electrical activity.
• Electrocardiography (ECG) is a key diagnostic tool in equine cardiology.

Purpose of the Study:

• To describe spatial vector changes during ventricular depolarization in horses.
• To introduce a novel method for depicting these spatial vector changes.
• To explore potential relationships between vector changes and cardiac anatomy or pathology.

Main Methods:

• Utilized a semi-orthogonal electrocardiogram (ECG) lead system in 190 horses.
• Developed a 3-parameter plot with a time axis to represent spatial vector changes.
• Identified distinct groups of horses based on clinical signs (diastolic murmurs, respiratory issues).

Main Results:

• Detailed descriptions and illustrations of spatial vector changes during depolarization were provided.
• Two distinct horse groups emerged, correlating with specific clinical findings.
• Observed vector changes may relate to the anatomical positioning of the ventricles.

Conclusions:

• Spatial vector analysis offers a new perspective on ventricular depolarization in horses.
• The findings suggest a correlation between cardiac electrical activity and ventricular anatomy.
• Specific ECG measurements may be valuable for evaluating myocardial changes in horses.