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The ST segment represents the end of ventricular depolarization and the beginning of ventricular repolarization. The point where the QRS complex ends and the ST segment begins is called the J point. A normal ST segment is usually level. Ischemia causes ST depression and T-wave inversion. Injury causes ST elevation. Infarction causes ST elevation and the presence of a Q wave, indicating a previous heart attack. The document then shows diagrams of abnormal ST segments in different leads that…
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Approach to ECG Interpretation
A step-by-step approach to ECG interpretation is explained in detail including ECG intervals, small and large boxes on the ECG and how many milliseconds each box represents.
