Which type of ST segment depression is considered the most significant?

The ST Segment represents the interval between ventricular depolarization and repolarization. The most important cause of ST segment abnormality (elevation or depression) is myocardial ischaemia or infarction.

What is significant ST elevation an indication of?

Since PR and PT interval are regarded as baseline, ST segment elevation is regarded as a sign of myocardial ischemia.

What is significant ST depression an indication of?

It is often a sign of myocardial ischemia, of which coronary insufficiency is a major cause. Other ischemic heart diseases causing ST depression include: Subendocardial ischemia or even infarction. Subendocardial means non full thickness ischemia.

What is the significance of ST elevation on an ECG with a patient who has chest pain?

Additionally, serial ECGs every 15 to 30 min should be performed in patients with ongoing symptoms in whom the initial ECG is not diagnostic of ST elevation MI (STEMI)[1]. ST elevation (STE) is considered to reflect acute transmural ischemia caused by an occlusion of an epicardial coronary artery by a blood clot.

What does ST elevation and depression mean?

The transition from ST segment to T-wave is smooth, and not abrupt. ST segment deviation (elevation, depression) is measured as the height difference (in millimeters) between the J point and the baseline (the PR segment). ST segment deviation occurs in a wide range of conditions, particularly acute myocardial ischemia.

Is ST depression serious?

ST depression in ECG at entry indicates severe coronary lesions and large benefits of an early invasive treatment strategy in unstable coronary artery disease.

What is ST depression in stress test?

ST-segment depression is a lowered J-point and a slope that occurs 60-80 ms after the J-point. This is the most common indicator of CAD. The standard criterion for a positive test is more than 1 mm horizontal or downsloping ST-segment depression with the PR segment as the isoelectric baseline of the ECG [61-65].

Does ST depression mean ischemia?

ST depression occurs when the J point is displaced below baseline. Just like ST elevation, not all ST depression represents myocardial ischemia or an emergent condition. There are multiple conditions associated with ST depression. Some of these include hypokalemia, cardiac ischemia, and medications such as digitalis.

What does ST elevation and depression on EKG mean?

It is important to note that on an EKG that presents both ST elevation and depression, ST elevation leads are the ones reflecting myocardial injury, thus determining location and extent of infarction. Acute pericarditis: at early stages, it can present a concave ST elevation in almost all leads and widespread PR segment depression.

What is the normal range of ST segment depression?

ST segment depression less than 0.5 mm is accepted in all leads. ST segment depression 0.5 mm or more is considered pathological. Some expert consensus documents also note that any ST segment depression in V2–V3 should be considered abnormal (because healthy individuals rarely display depressions in those leads).

How is acute ST segment elevation myocardial infarction diagnosed?

It is possible to make diagnosis of acute ST segment Elevation Myocardial Infarction (STEMI) when, in a certain clinical context, a new ST segment elevation is detected in at least two continuous leads.

What is ST segment elevation and ST segment deviation?

The ST segment may be displaced upwards (ST segment elevation) or downwards (ST segment depression). The term ST segment deviation refers to elevation and depression of the ST segment. The magnitude of ST segment deviation is measured as the height difference (in millimeters) between the J point and the PR segment.