U wave that occurs just after the T wave and is usually of smaller amplitude than the T wave. Flattening of the T wave. ST depression on occasion, which can mimic ischemia.

See the ECG Tutorial section on QT interval to learn how this is measured. Multiple medications, electrolyte abnormalities (hypocalcemia, hypomagnesemia and hypokalemia) and certain disease states ...

However, low potassium and magnesium levels can be caused by medication, specifically proton pump inhibitors for the management of GERD which he has a history of. An electrocardiogram (ECG ...