How to read EKG strips. Recognize ST segment elevation and depression. This video (updated with real voice) and other related images/videos (in HD) are available for instant download licensing here:
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The ST segment extends from the end of the S wave to the start of the T wave. A normal ST segment is mostly flat and level with the baseline. Elevation of more than two small squares in the chest leads or one small square in the limb leads, indicates the possibility of myocardial infarction. The infarction may be localized based on the leads with ST elevation.
There is usually a reciprocal ST depression in the electrically opposite leads. For example, ST elevation in leads I and aVL typically produces ST depression in lead III.
Pericarditis causes a characteristic “saddleback” ST segment elevation and PR segment depression in all leads except aVR and V1, where the reverse - ST depression and PR elevation – are seen.
ST depression is diagnostic of ischemia. ST depression may be of various morphology and may be seen in a variable number of leads, and therefore cannot be used to localize the lesion.
ECG Interpretation Basics continued - ST Segment Changes, Animation. electrocardiography journal | |
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| Education | Upload TimePublished on 7 Nov 2016 |
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