JTcF - Fridericia's Correction Formula

**Semantic type:** Quantitative Concept

**Definition:** A formula which takes into account the physiologic shortening of the JT interval which occurs as the heart rate increases, permitting comparison of the JT interval across a range of rates. It is mathematically defined as: JTcF = JT/CubeRootRR(seconds) and theoretically corrects the JT interval to that which would be observed at a heart rate of 1 cycle per second.