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  ECG- Electrocardiography ECG CHANGES & INTERPRETATION 1. Shortened QT Interval- Hypercalcemia, certain genetic abnormalities, and Hyperkalemia. 2. Prolonged QT Interval- Hypocalcemia, certain genetic abnormalities. 3. Flattened or Inverted T waves- Coronary ischemia, hypokalemia, Left Ventricular hypertrophy, digoxin effect. 4. Hyperacute T waves- Most probably due to acute myocardial infarction, where T waves become more prominent, symmetrical, and pointed. 5. Peaked T wave, wide QRS Complex, prolonged PR intervals, reduced QT segment- Hyperkalemia, treat with calcium chloride, glucose, and insulin therapy, or dialysis. 6. Prominent U waves- Hypokalemia ABNORMAL ECG READINGS 1. Peak T wave present in Hyperkalemia 2. Inversion of the T wave in Myocardial Infarction 3. Depressed ST Segment in Angina Pectoris 4. Elevated ST Segment in Myocardial Infarction 5. Widened QRS Complex in Arrhythmia