Cardiology / Emergency Medicine
ECG Acute MI, Rhythm & QTc
Educational bedside worksheet. Does not independently diagnose MI or replace a 12-lead ECG, serial ECGs, troponins, symptoms, exam, or cardiology consultation.
Emergency warning: Chest pressure, dyspnea, diaphoresis, syncope, shock, malignant arrhythmia, or a concerning ECG requires immediate emergency evaluation. Do not delay treatment while using this tool.
1. ECG image workspace
Image remains in your browser; nothing is uploaded.
A photograph can be distorted, cropped, poorly calibrated, or missing leads. Use the original ECG whenever possible.
2. Patient and ECG settings
3. Rhythm assessment
4. QTc calculator
Measure QT from QRS onset to T-wave end in a lead with a clear T wave. Avoid U waves; average several beats when rhythm is irregular.
5. ST elevation at the J point
Enter millimeters of ST elevation relative to the PR/TP baseline. Use negative values for depression.
6. Other high-risk findings
Reference thresholds used by this prototype
- STEMI-type elevation: New J-point elevation in ≥2 contiguous leads. ≥1 mm outside V2–V3; V2–V3 ≥2.5 mm (men <40), ≥2 mm (men ≥40), ≥1.5 mm (women).
- QTc formulas: Bazett QT/√RR · Fridericia QT/∛RR · Framingham QT + 0.154(1−RR), in seconds.
- Marked prolongation: QTc ≥500 ms flagged as high risk; interpret with rhythm, QRS width, medications, electrolytes, and context.
- Wide QRS: ≥120 ms.
Prototype only. No automated image recognition is performed.