Description: I am working on a project that involves using ECG as a predictor for treatment response in heart failure patients, particularly those treated with SGLT2 inhibitors. Could you explain how you validated ECG changes as a predictor of treatment outcomes? What methodologies did you use to correlate ECG data (such as QT interval, heart rate variability, or ST segment changes) with clinical outcomes like symptom improvement, ejection fraction, and hospitalization rates? Any insights into the statistical approaches (e.g., regression analysis, survival analysis) you applied would also be very helpful.