Notes on ECG. Section 1: the normal ecg 1. What is cardiac electrical activity 1.1 In the walls of the ventricles, depolarisation spreads outwards from the endocardium towards the epicardial surface of the heart. 1.2 Repolarisation spreads through the ventricles in the opposite direction to the depolarisation wave moving from the epicardial to the endocardial surface of the chambers. 1.3 The interventricular septum is the first part of the ventricular muscle mass to depolarise by movement of depolarisation across the septum from the left towards the right bundle branch.
2. How do you do the ECG nomenclature 2.1 The flat line recorded on the ECG when no current is flowing is called the ‘isoelectric line’. 2.2 Atrial depolarisation produces a deflection called a P wave. 2.3 Ventricular depolarisation produces the qrs complex. 2.4 The diffuse deflection produced by ventricular…
