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

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.

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
References in periodicals archive ?
Caption: Figure 2: 12-Lead electrocardiogram four hours post-procedure demonstrating T-wave inversion in the inferolateral leads (grey arrows), with ST segment elevation in V2-V4 (black arrows) and voltage criteria for left ventricular hypertrophy.
53) Similar findings were echoed in a recent trial from the EuroHeart survey, wherein a nearly 40% reduction in the risk for death was observed in ACS patients receiving IABP support--a benefit independent of ST segment status.
Their subsequent use of transoesophageal echocardiography (TOE) during the procedure enabled them to demonstrate the appearance of intracardiac and aortic air, with concurrent ST segment depression in ECG lead II with hypotension.
The ST segment was measured at J plus 60 ms, with the PR interval used as the isoelectric reference point.
2) Our patient presented with an AVNRT followed by profound hypotension and ultimately, cardiogenic shock and diffuse right and left ventricular ST segment changes that persisted even when she was in sinus rhythm.
The ST segment is a section of an electrocardiogram (ECG) that depicts electrical changes between heartbeats.
ST segment elevation with exercise: a marker for poor ventricular function and poor prognosis.
ST segment elevation [is greater than or equal to] 2 mm in [is greater than] 2 contiguous leads on an electrocardiogram performed just before PCI and paired electrocardiograms at baseline and [less than or equal to] 4 hours after PCI that were adequate for interpretation.
The occurrence of ST segment depressions during stress tests indicates myocardial ischemia [American College of Cardiology/American Heart Association (ACC/AHA) 1997].
It is characterized by chest pain, ST segment changes in the anterior precordial leads on electrocardiography (ECG), and transient left ventricular dysfunction with marked apical asynergy and ballooning.
Factors predicting mortality in patients after myocardial infarction caused by left main coronary artery occlusion: significance of ST segment elevation in both aVR and aVL leads.
In this study, the specific pattern of hsTn change in a patient admitted with chest pain, paroxysmal supra-ventricular tachycardia (PSVT) and ST segment depression in electrocardiogram (ECG) without coronary artery disease (CAD) would be introduced.