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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Little Beaver Creek (Lorain County, Ohio) Little Cuyahoga River; Little Darby Creek; Little Hocking River; Little Miami River; Little Muskingum River; Little Ottawa River; Little Sandusky River; Little Scioto River (Ohio River tributary) Little Scioto River (Scioto River tributary) Little Wakatomika Creek; Loramie Creek; Mad River; Mahoning River; Margaret Creek