what does isoelectric line represent
The difference between intervals and segment is that intervals include the waves,and segments don't.
The R-T segment is the portion of the EKG tracing from the R wave to the T wave.
QRS
The SI segment on an EKG refers to the segment that occurs between the end of the P wave and the beginning of the QRS complex. This segment represents the time during which the atria are depolarizing and the ventricles are preparing for depolarization. It is part of the overall electrical activity of the heart, but it is not typically analyzed in isolation for clinical interpretation. Instead, attention is usually focused on the P wave, QRS complex, and T wave for assessing cardiac function.
I believe you are referring to STEMI (ST segment elevation myocardial infarction) and non-STEMI. These are two different forms of myocardial infarction - STEMI results in transmural (all the way through the cardiac muscle wall) injury, which results in elevation of the ST segment on EKG. Non-STEMI (NSTEMI), which used to be called a Non-Q-wave MI, is usually a subendocardial injury, which results in cardiac injury, but not as severe as STEMI. NSTEMIs do not have any elevation of the ST segment on EKG. These only have elevation of cardiac biomarkers on blood work.
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An EKG
The ECG sign of subendocardial ischemia is ST segment depression. Note that ECG is used more now that EKG.
because in Germany they called it an electrokardiogram. and EKG stuck. but cardio is greek deriviative and in English we say ECG... but its still easier and rolls off the tongue better as EKG so it has stuck.
by largest, I'll assume tallest. the tallest wave on an EKG is called the QRS complex and represents the contraction of the left ventricle. btw tallest could also mean lowest depending on the particular ekg lead.
before and after you run EKG
Depends : fingers, stethoscope, EKG.