6.2.1 Electrical Potential and Electrolytes
Here is a great image which shows the action potential in electrical wave form and what happens at each phase of the depolarization and repolarization process. You can also see where the different types of anti-dysrhythmic medications act. Below the action potential wave is an example of what that looks like on the ECG.
Sertion, CC BY-SA 4.0 <https://creativecommons.org/licenses/by-sa/4.0>, via Wikimedia Commons
As you view an ECG reading, each waveform represents something going on in the cardiac electrical conduction system. As you read, consider what each wave represents? P wave, QRS wave, T wave. There are also certain intervals we measure to see how long it takes for the electrical conduction to take place. Those intervals are the P-R, QRS, and QT intervals.
