how to correct qtc for heart rate?
['Bazett formula: QTC = QT / √ RR.', 'Fridericia formula: QTC = QT / RR 1/3', 'Framingham formula: QTC = QT + 0.154 (1 – RR)', 'Hodges formula: QTC = QT + 1.75 (heart rate – 60)']