MODERN METHODS FOR REGISTRATION OF ELECTROCARDIOGRAM IN HORSES
Abstract
Electrocardiography is the main tool for diagnostics and
classification of arrhythmias. In order to get a proper diagnosis for arrythmia it is
essential to have a clear electrocardiogram (ECG) record and advanced results
analysis skills. Due to anatomical and physiological features the ECG in horses
provides little to no information about size of the heart structures and specific origin
of the ectopic beat. As of today, it mostly provides information concerning heart
rhythm and rate. Under normal conditions current follows a fixed pattern through
the heart through sinus node and atrial myocardium, atrioventricular node, the Hiss
and Purkinje system to the ventricular myocardium. This results in de- and
repolarization of the myocytes, which occurs on the basal ECG as deviations in the
form of P and T waves and the QRS complex.
Modern devices for ECG registration are equipped with accumulator,
memory card and telemetry function, which provides an opportunity for vet
cardiologists to conduct ECG registration at rest, during exercise, and over long
period of time. This is crucial for diagnostics of arrhythmias, collapse, poor
performance, and especially during critical care and treatment by preparations
affecting cardiovascular system. The electrode placement may differ according to
the type of investigation, but it is important to place them along the mean electrical
axis of the heart, which provides the appropriate deviations on the ECG.
Keywords: electrocardiography in horses, cardiology, ECG
electrode placement
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