<P> Definitions of normal QTc vary from being equal to or less than 0.40 s ( ≤ 400 ms ) , 0.41 s ( ≤ 410ms ) , 0.42 s ( ≤ 420ms ) or 0.44 s ( ≤ 440ms ) . For risk of sudden cardiac death , `` borderline QTc '' in males is 431 -- 450 ms ; and , in females , 451 -- 470 ms . An `` abnormal '' QTc in males is a QTc above 450 ms ; and , in females , above 470 ms . </P>
<P> Definitions of normal QTc vary from being equal to or less than 0.40 s ( ≤ 400 ms ) , 0.41 s ( ≤ 410ms ) , 0.42 s ( ≤ 420ms ) or 0.44 s ( ≤ 440ms ) . For risk of sudden cardiac death , `` borderline QTc '' in males is 431 -- 450 ms ; and , in females , 451 -- 470 ms . An `` abnormal '' QTc in males is a QTc above 450 ms ; and , in females , above 470 ms . </P>
what are the upper limits of normal for the qtc
what are the upper limits of normal for the qtc
in males is 431 -- 450 ms ; and , in females , 451 -- 470 ms
in males is 431 -- 450 ms ; and , in females , 451 -- 470 ms