- A normal EKG reading is referred to as normal sinus rhythm. It is made up of waves displayed as a tracing on a metric grid. Each heartbeat consists of a P wave, a QRS complex, an ST segment, a T wave and U waves.
- In normal sinus rhythm, each P wave appears as a bump in the tracing between 60 and 100 beats per minute. Normal P waves should appear less than 2.5 mm high and 0.11 seconds wide in lead II in a twelve-lead EKG.
- After the P wave, there is a short straight line leading to the QRS complex.
- A normal QRS complex follows the P wave and appears as a spike on the tracing. It should be less than 0.12 seconds long.
- The ST segment is a straight line between the QRS complex and the T wave and should not display any elevation or depression.
- Following the QRS complex, a T wave appears as a slightly smaller bump than the P wave. It should not be tall, flattened or inverted.
Normal Sinus Rhythm
P Wave
PQ Interval
QRS Complex
ST Segment
T Wave
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