Action potential & ECG
8 important questions on Action potential & ECG
What is the difference between action potentials in the heart, and the ECG?
- but the difference in electrical activity between different parts of the heart is measured, which is the ECG.
What does it mean when the ECG shows a difference of electrical activity of 0?
Which interval in the ECG shows the delay of the AV node?
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Which interval in the ECG shows both depolarization and repolarization of the ventricles?
What are the three things that determine the ECG?
2. The distance between the electrodes
3. The mass of the heart
How does a transmural infarct influence the ECG?
- which causes not all cells to be depolarized at the end of the QRS wave,
- which causes a signal between S and T (where you would expect 0)
What are the two kinds of ectopic beats?
2. Origin is ventricular
How can the origin of ectopic beats be determined from the ECG?
- when the origin is extraventricular, the QRS wave is normal, because the ventricles react to whatever signal comes through, so there is no difference with a normal signal
- when the origin is ventricular, the QRS wave is wider, because the normal conduction system is not used, so it is less efficient
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