![]() ![]() Although one can often feel when the heart beats very fast, or if it skips a beat, usually people cannot feel if the time it takes for their heart to beat is increasing.When determining if the QT interval is prolonged due to medications, a corrected value is used, known as the QTc interval. QT prolongation is when the QT interval takes longer to complete that usual. What does QT Interval Prolongation look like? ![]() Importantly, up to 20% of healthy people have a QTc interval outside of this range Some references use an upper limit of normal of 470 msec.Between 390 - 450 milliseconds for a man.Some references use an upper limit of normal of 480 msec. ![]() ![]()
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