ST segment
In electrocardiography, the ST segment connects the QRS complex and the T wave and has a duration of 0.005 to 0.150 sec (5 to 150 ms).
It starts at the J point (junction between the QRS complex and ST segment) and ends at the beginning of the T wave. However, since it is usually difficult to determine exactly where the ST segment ends and the T wave begins, the relationship between the ST segment and T wave should be examined together. The typical ST segment duration is usually around 0.08 sec (80 ms). It should be essentially level with the PR and TP segments.
The ST segment represents the isoelectric period when the ventricles are in between depolarization and repolarization.
Interpretation
- The normal ST segment has a slight upward concavity.
- Flat, downsloping, or depressed ST segments may indicate coronary ischemia.
- false negative rate of 20–30%.[1]
- digitalis toxicity.[2]
In fetal monitoring
In
base deficit.[3]
References
- ISBN 0-7817-1649-7.
- ^ "Reading an EKG". uab.edu. 2010-03-25. Archived from the original on 2010-03-25. Retrieved 2021-11-04.
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: CS1 maint: unfit URL (link) - S2CID 10815181.