User Guide - QTc Calculator
Learn to calculate QTc from ECG photos
How to Use
1. Upload ECG Photo
Select a photo from gallery or capture with camera. Make sure the image is clear and ECG grid is visible.
2. Calibration
Mark 2 points corresponding to 5 small squares (5mm or 200ms on standard paper). This step is essential for measurement accuracy.
3. Mark QT Interval
Mark the start of QRS complex and end of T wave. Use zoom mode for greater precision.
4. Mark RR Interval
Mark two consecutive R waves. The app automatically calculates heart rate and QTc.
Available Formulas
- Bazett: Most traditional, overcorrects at high HR
- Fridericia: More accurate at extreme HR
- Framingham: Linear, good overall performance
- Hodges: Linear, simple to use
- Dmitrienko: Optimized for drug studies
Access Model
- Free Start: 10 free measurements
- Packs: 100 measurements for R$ 97.00