What Is The Significance Of Each Lead Of ECG

Lead animal tissues and body fluids can be conductive, record of electrocardiograph electrodes on the surface of any two of electrical parts, such as can record the ecg changes of images, this method of measurement is called bipolar lead, measured the potential changes is the body surface potential of the test points and the algebra, analysis of waveform more complex medical teaching | education net collection.

If one of the two measuring electrodes, usually the electrode connected to the negative end of the tracer, is kept at zero potential, it becomes the so-called "independent electrode", and the other measuring electrode is placed at a certain point on the body surface as the "probe electrode", this measurement method is called unipolar lead. Because the unrelated electrode often keeps the zero potential constant, the measured potential change only represents the potential change at the location of the probe electrode, so the interpretation of the waveform is relatively simple.

Both unipolar and bipolar leads are currently used during clinical examination of the ECG. There are 12 methods of ECG leads that are routinely used.

Standard leads are bipolar leads and can only trace the potential difference between two electrodes. The electrode connection method was as follows: the first lead (referred to as mutual), the right arm (-), the left arm (+); The second lead (referred to as ⅱ), right arm (-), left foot (+); The third lead (referred to as ⅲ), left arm (-), left foot (+).