ST segment elevation can be caused by Early repolarization Left ventricular hypertrophy Myocardial ischemia and infarction Left ventricular aneurysm Pericarditis Hyperkalemia Hypothermia Pulmonary embolism ST segment depression can be caused by Hypokalemia Digoxin Subendocardial ischemia Reciprocal changes in acute myocardial infarction T wave The T wave reflects ventricular repolarization.