BSCI450: ECG tracing of intervals

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Last updated 11:48 PM on 7/31/26
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9 Terms

1
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P Wave

first interval

Atrial depolarization

<p>first interval</p><p>Atrial depolarization</p>
2
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PR Interval

second interval

AV node conduction delay

<p>second interval </p><p>AV node conduction delay</p>
3
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QRS Complex

third interval

Ventricular depolarization (atria repolarizing simultaneously)

<p>third interval</p><p>Ventricular depolarization (atria repolarizing simultaneously)</p>
4
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ST Segment

fourth interval

Ventricles fully depolarized → time during which ventricles are contracting and emptying

<p>fourth interval</p><p>Ventricles fully depolarized → time during which ventricles are contracting and emptying</p>
5
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T Wave

fifth interval

Ventricular repolarization

<p>fifth interval</p><p>Ventricular repolarization</p>
6
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TP Interval

sixth interval

Time during which ventricles are relaxing and filling → post-repolarization and then flat line indicating leftover 20% pump of blood

<p>sixth interval</p><p>Time during which ventricles are relaxing and filling → post-repolarization and then flat line indicating leftover 20% pump of blood</p>
7
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QT Interval

last interval

Total ventricular depolarization + repolarization

time from beginning of QRS complex that represents ventricular depolarization to the end of the T wave, representing ventricular repolarizaion

<p>last interval</p><p>Total ventricular depolarization + repolarization</p><p>time from beginning of QRS complex that represents ventricular depolarization to the end of the T wave, representing ventricular repolarizaion</p>
8
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What happens to the duration of the QT interval in hypercalcemia/hyperkalemia?

shortened QT interval

activation phase

9
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What happens to the duration of the QT interval in hypocalcemia/hypokalemia?

prolonged/longer QT interval

inactive and prolonged delay