Leads in veterinary electrocardiography
The lead system is the basis of ECG reading. Understand bipolar, unipolar and precordial leads and what each reveals.
Electrocardiography records the heart’s electrical activity from different points of view — the so-called leads. Each lead is a pair (or combination) of electrodes that “sees” the cardiac electrical vector from a distinct angle.
Bipolar leads (Einthoven)
Leads I, II and III form Einthoven’s triangle and measure the potential difference between two limbs. In veterinary routine, lead II is usually the reference for rate and rhythm.
Unipolar and precordial leads
Augmented unipolar leads (aVR, aVL, aVF) and precordial leads expand the spatial view of the heart, helping to locate axis changes and QRS complex morphology.
Why they matter
The combined reading of leads is what allows differentiating arrhythmias, assessing overloads and monitoring the patient peri-operatively. The more simultaneous leads, the more complete the interpretation.
Fontes
As fontes serão adicionadas na revisão por veterinário credenciado, com referências reais ancoradas no PubMed (pipeline de conteúdo governado).