Calculating QT interval duration Count the number of squares from the beginning of the QRS complex to the end of the T wave. Multiply this number by 0.04 second. The normal range is 0.36 to 0.44 second, or 9 to 11 small squares wide.alculating QT interval duration Count the number of squares from the beginning of the QRS complex to the end of the T wave. Multiply this number by 0.04 second. The normal range is 0.36 to 0.44 second, or 9 to 11 small squares wide.
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Cypress Creek (Texas) Cypress Creek (Texas) is a stream that flows from Snake Creek and Mound Creek in Waller County, Texas to its mouth at Spring Creek in Harris County, Texas. It is part of the Cypress Creek watershed, and flows into the west fork of the San Jacinto River watershed- eventually flowing to the Gulf of Mexico.