Identify the different positive and negative deviations and describe what each represents in the cardiac cycle. All regions of this conduction system fire impulses, become irritable and each part of the cardiac cycle produces a different electrical impulse and there is no current strong enough to create a positive or negative deflection.6. Explain the purpose of ECG standardization. ECG calibration is important because it helps to know whether the machine is ready and working properly or not.7. Identify the 12 leads of an ECG and describe which area of ​​the heart each lead represents. Orientation of the 12-lead ECGIt is important to remember that the 12-lead ECG provides spatial data on the electrical activity of the heart in 3 approximately orthogonal directions: Right ⇔ Upper Left ⇔ Anterior Lower ⇔