ST segment

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RST seg·'ment

the part of the electrocardiogram between the QRS complex and the T wave. Virtually never distinct in normal hearts in which it forms the initial limb of the T wave without an agreed endpoint.
Synonym(s): ST segment
Farlex Partner Medical Dictionary © Farlex 2012

ST seg·ment

The part of an electrocardiographic tracing that begins at the end of a QRS complex, contains the J point, and ends at the beginning of the ensuing T wave.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012

ST segment

, S-T segment
The line on an electrocardiogram that begins with the end of the QRS complex and ends at the beginning of the T wave. The height of the ST segment is normally equal to that of the P-R interval and the TP interval. ST segment elevation is found in patients with acute myocardial infarction and other conditions. ST segment depression is an indicator of coronary ischemia.
See also: segment
Medical Dictionary, © 2009 Farlex and Partners
References in periodicals archive ?
- Patient having typical cardiac chest pain and ECG showing ST segment elevations in anterior leads but isoelectric ST segment in inferior leads may represent ischaemia extending to entire inferior territory.
Diagnostic criteria for de Winter pattern are: tall, prominent, symmetrically peaked T-waves in the precordial leads, upsloping ST segment depression > 1 mm at the J-point in the precordial leads, absence of ST elevation in the precordial leads, ST segment elevation (0.5 mm-1 mm) in aVR.
We used WHO calculator for sample size and included consecutive 960 patients with ST segment elevation Myocardial infarction presented in emergency department for one year from Jan 2016 to Dec 2016.
In conditions with short PR interval like sinus tachycardia, the [T.sub.a] wave can blend into the ST segment and cause ST segment depression mimicking myocardial ischemia.
Typical ECG ST segment elevations vary in amplitude and morphology and they have been known to be transient, making the diagnosis more difficult.
ECG revealed ST segment elevation in leads D1, D2, aVL, aVF, V3, V4, V5, and V6 (Figure 1).
* Type 1 consists of coved-type ST segment elevation of [greater than or equal to] 2 mm followed by a negative T wave.
24 hour ECG Holter monitoring has shown stable sinus rhythm with an average of 67 beats per minute (minimum of 60 beats per minute and maximum 87 beats per minute), diffuse variable ST segment depressions and negative T waves, rare and isolated supraventricular and ventricular ectopic beats, with uniform distribution between active and passive periods.
Elevated ST segments in V4R or V3R to V6R can be used to diagnose RVI.
The most prominent and consistent response to ischemia in the electrocardiogram (ECG) during exercise is ST depression; however the wide variability in the pattern of ST changes and the significant rate of false positive and false negative findings demand that clear understanding of the ST segment changes appearing during stress is necessary for proper interpretation of the test result.
The ECG shows coved Type 1 ST segment elevation in keeping with a diagnosis of Brugada syndrome.