Electrocardiogram

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6 Terms

1
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P wave

time for the passage of the electrical impulse through the atrium causing atrial depolarization (contraction

2
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P-R interval

from the beginning of the P wave to the beginning of the QRS complex. It represents the time taken for the impulse to spread through the heart conduction system to a point immediately preceding ventricular contraction

3
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QRS complex

measured from the beginning to the end of the QRS complex. 
It represents the time taken for depolarization (contraction) of both ventricles


4
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ST segment

is measured from the S wave of the QRS complex to the beginning of the T wave. It represents the time between ventricular depolarization and repolarization (diastole). It should be isoelectric (flat)

5
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T wave

represents the time for ventricular repolarization. It should be upright

6
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Q-T interval

measured from the beginning of the QRS complex to the end of the T wave. It represents the time taken for entire electrical depolarization and repolarization of the ventricles