QT Interval Calculator
QTc = QT / √(RR)
Torsades Risk Assessment
ECG Parameters
Correction Formula
Example Cases
Common QT‑prolonging Drugs
| Drug | Class | Risk |
|---|---|---|
| Amiodarone | Antiarrhythmic | High |
| Haloperidol | Antipsychotic | Moderate |
| Azithromycin | Macrolide | Moderate |
| Citalopram | SSRI | Dose‑dependent |
| Ondansetron | Antiemetic | Moderate |
QTc Risk Categories
Normal<440 (M) / <470 (F)
Borderline440‑470 (M) / 470‑480 (F)
Prolonged>470 (M) / >480 (F)