1. What is JTc Correction?

JTc (corrected JT interval) corrects for depolarization by subtracting QRS duration from QTc. Normal JTc values are <360 ms for men and <370 ms for women.

2. How Does the Calculator Work?

The calculator uses the JTc formula:

Where:

• \( QTc \) — Corrected QT interval (ms)
• \( QRS \) — QRS duration (ms)

Explanation: The JT interval represents ventricular repolarization time independent of depolarization. JTc provides a more accurate assessment of repolarization abnormalities.

3. Importance of JTc Calculation

Details: JTc measurement is important for assessing ventricular repolarization abnormalities, detecting drug-induced QT prolongation, and evaluating arrhythmia risk.

4. Using the Calculator

Tips: Enter QTc and QRS values in milliseconds, select gender. All values must be valid (QTc > 0, QRS ≥ 0).

5. Frequently Asked Questions (FAQ)

Q1: Why calculate JTc instead of just QTc?
A: JTc provides a more specific measure of repolarization by excluding depolarization time (QRS duration), especially in cases of widened QRS.

Q2: What are normal JTc values?
A: Normal JTc is <360 ms for men and <370 ms for women. Values above these thresholds may indicate repolarization abnormalities.

Q3: When is JTc particularly useful?
A: JTc is especially valuable in patients with bundle branch blocks or ventricular conduction delays where QRS duration is prolonged.

Q4: Are there limitations to JTc measurement?
A: JTc may be less reliable in cases of extreme tachycardia or when the T wave end is difficult to determine accurately.

Q5: How should JTc be interpreted clinically?
A: JTc should be interpreted in conjunction with other clinical findings and ECG parameters. Prolonged JTc may indicate increased risk of arrhythmias.