Introduction to ECG interpretation

Cardiac electrophysiology: action potential, automaticity and vectors

Cardiac electrophysiology: membrane potential, action potential, automaticity and electrical vectors   Video lecture The following video lecture summarises this chapter.   The action potential includes a depolarization (activation) followed by a repolarization (recovery). The action potential occurs in all cardiac cells but its appearance varies depending on cell type. During de- and repolarization ions (Na+ [sodium],…


Clinical electrocardiography and ECG interpretation

Principles of cardiac electrophysiology and ECG interpretation The cardiac cycle begins when an action potential is discharged in the sinoatrial node (Figure 1). From there the action potential spreads through the atrial and ventricular myocardium. The action potential elicits intracellular processes which activates the cells, whereby they contract. For the heart to work effectively, the atria and…


How to interpret the ECG / EKG: a systematic approach

Systematic approach to ECG interpretation: efficient and safe method The ECG must always be interpreted systematically. Failure to perform a systematic interpretation of the ECG may be detrimental. The interpretation algorithm presented below is easy to follow and it can be carried out by anyone. The reader will gradually notice that ECG interpretation is markedly facilitated by…

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