What does the ST segment represent?

What does the ST segment represent?

The ST segment is that portion of the ECG cycle from the end of the QRS complex to the beginning of the T wave (Fig. 2-10). It represents the beginning of ventricular repolarization.

What does ST segment elevation represent?

ST-segment elevation myocardial infarction (STEMI) is the term cardiologists use to describe a classic heart attack. It is one type of myocardial infarction in which a part of the heart muscle (myocardium) has died due to the obstruction of blood supply to the area.

What does a depressed ST segment indicate?

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 an inverted ST segment mean?

T-wave inversion in the anterior precordial leads may be seen in cases of acute pulmonary embolism, while flat- tened T waves with prominent U waves and ST-segment depression may reflect hypokalemia or digitalis therapy.

How much should up sloping ST segment be depressed?

So for slow up sloping ST segment , to be reported as positive it should depress atleast 1.5mm or some times 2mm. Available evidence suggest a rapidly upsloping ST segmen t (> 1.5mv /Sec) is a non ischemic response irrespective of the quantum of ST depression at 80msec. However , a rapidly upsloping ST is rarely depressed beyond 2mm .

What does depression of the ST segment Mean?

Depression of the ST segment and inversion of the T wave are common electrocardio- graphic abnormalities. Knowing the various ischemic and nonischemic morphologic fea- tures is critical for a timely diagnosis of high- risk myocardial ischemia and electrolyte- or drug-related abnormalities.

What does it mean when your ST segment is flat?

Interpretation The normal ST segment has a slight upward concavity. Flat, downsloping, or depressed ST segments may indicate coronary ischemia. ST elevation may indicate transmural myocardial infarction. ST depression may be associated with subendocardial myocardial infarction, hypokalemia, or digitalis toxicity.

What does the elevation of the ST segment Mean?

The normal ST segment has a slight upward concavity. Flat, downsloping, or depressed ST segments may indicate coronary ischemia. ST elevation may indicate transmural myocardial infarction. An elevation of >1mm and longer than 80 milliseconds following the J-point.