Ekg rhythm's have a certain measurement for every PR interval, QRS width, ST segment and the QT interval on Ekg paper. The PR interval typically measures 0.12 to 0.2 seconds, QRS typically measures 0.06 to 0.1 seconds, ST segment if elevated 1mm or greater is ST elevation and means there is active injury taking place. If there is ST depression there is ischemia that has occurred. QT interval measures the time it takes for the ventricles to depolarize an repolarize to the ventricular repolarization. For more information on this topic please see: http://geekymedics.com/body-systems/cardiology/understanding-an-ecg/. This Ekg grip can show the rhythm strip paper and what each box measures. One small box measures 0.04 seconds. There are 5 small boxes measuring 0.04 in one large box. 0.04 x 5= 0.2 seconds. When looking at rhythms and measuring them these boxes are an important component of measurements and rhythm rate. Please review this grid and see the example rhythm strips below. Can you identify the PR interval, QRS width, ST segment and is it ST elevation or ST depression and the QT interval? If you have any questions feel free to ask Marna.
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