Identify the various positive and negative deflections and describe what each represents in the cardiac cycle. All regions of this conduction system initiate impulses, become irritable, and each portion of the cardiac cycle produces a different electrical impulse, and there is no current strong enough to create a positive or negative deviation.6. Explain the purpose of ECG standardization. ECG calibration is important because it helps you understand 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 ECG It 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 ⇔ Left Upper ⇔ Lower Anterior ⇔