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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Myrtle Creek is a city in Douglas County, Oregon, United States. The population was 3,419 at the 2000 census. It is the birthplace of U.S. Senator Jeff Merkley. According to the United States Census Bureau, the city has a total area of 1.8 square miles (4.5 kmÂ²), all of it land.