After obtaining written, informed consents, individuals are subjected to thorough clinical evaluation (age, sex, history of hypertension (HTN) or diabetes mellitus (DM)) and laboratory tests including complete blood count, urea, creatinine, glomerular filtration rate (eGFR) (calculated by CKD-EPI equation) , serum potassium, magnesium, calcium, phosphorus, parathyroid hormone (PTH), iron and total iron binding capacity (TIBC).
Twelve-lead ECG is performed and all ECGs are reviewed for the following parameters: heart rhythm, heart rate, frontal axis, P wave, PR interval, QRS duration, pathological Q wave, fragmented QRS morphology, ST-segment deviation, QT interval and T wave abnormality.
