![]() In this and the other two limb leads, an electrode on the right leg serves as a reference electrode for recording purposes. By convention, lead I has the positive electrode on the left arm, and the negative electrode on the right arm, and therefore measures the potential difference between the two arms. ![]() Electrocardiogram Standard Limb Leadsīipolar recordings utilize standard limb lead configurations depicted in the figure. In the Cabrera format, 2 additional lead pairs are evident I/aVR andaVR/II. Only 3 lead pairs in the frontal plane can easily be recognized aVL/I, II/aVF and III/aVF. In the standard presentation anatomically contiguous leads are not presented adjacently, which makes it unnecessarily difficult for the inexperienced ECG reader to apply the STEMI criteria. The electrocardiographic diagnosis of ST-elevation myocardial infarction is based on presence of significant ST elevation in at least 2 anatomically contiguous leads. The ECG is an essential diagnostic tool, since it is available very early in the management of patients with suspected acute coronary syndrome, often considerably earlier than biomarkers and other diagnostic modalities.
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