The basics EP

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Where the leads are and what they're called, reading a 12 lead, the timings for EKG intervals

Last updated 7:49 PM on 8/5/26
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8 Terms

1
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SA node

Primary pacemaker of the heart, located in the HRA

2
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P-wave

Depolarization and contraction of the atria

3
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QRS complex

Depolarization of the ventricles (repolarization of the atria is hidden in here)

4
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ST-segment

Horizontal paceline associated with plateau phase of ventricular repolarization

5
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T-wave

Rapid repolarization of the ventricles

6
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QT-interval

Duration of ventricular contraction

7
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Limb leads

Lead I (+L to -R), lead II (+F to -R), and lead III (+F to -L)

8
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How long should each of the intervals be