What are the indications for ECG testing?
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“An electrocardiogram (ECG) is the only test that can accurately diagnose an arrhythmia or a conduction abnormality. And an ECG will help you decide when other diagnostic tests should be done, including blood pressure measurement, thoracic radiography, or even echocardiography.”
-Larry P. Tilley, DVM, DACVIM
From Essentials for interpreting ECGs in practice