What is normal QTc interval for females?

In general, the normal QT interval is below 400 to 440 milliseconds (ms), or 0.4 to 0.44 seconds. Women have a longer QT interval than men. Lower heart rates also result in a longer QT interval.

What is a good QTc interval?

QTc intervals of less than 440 ms are considered to be normal in healthy patients. QTc intervals of 440 ms to 460 ms in men and 440 ms to 470 ms in women are considered borderline.

What is a bad QTc?

A QTc interval of at least 470 milliseconds is a predictor for increased risk for symptoms, whereas a QTc of at least 500 milliseconds predicts an increased risk of life-threatening cardiac events.

What is prolonged QTc interval?

In long QT syndrome, your heart’s electrical system takes longer than normal to recharge between beats. This delay, which often can be seen on an electrocardiogram (ECG), is called a prolonged QT interval.

How long is too long for a QTc interval?

The normal QT interval varies depending on age and gender, but it’s usually 0.36 to 0.44 second (see QT interval ranges). Anything greater than or equal to 0.50 second is considered dangerous for any age or gender; notify the healthcare provider immediately.

What is a normal QT interval for a woman?

The normal QTc interval is taken as 0.36-0.44s. The normal QT interval in women is slightly higher than in men. Normal QTc for males 0.36 – 0.44s. Normal QTc for females 0.36 – 0.46s.

What is the normal range for QT interval?

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.

What causes prolonged QTc interval?

There are two common causes of QT interval prolongation: (1) genetic mutations and (2) particular medications. Genetic mutations. Several genetic mutations have been associated with some degree of QT interval lengthening. The most severe mutation results in a syndrome called Long-QT-Syndrome ( LQTS ).