Q 1: What does T wave represent?
Q 2: What is the normal amplitude of T wave?
Q 3: What does abnormal T wave indicate?
Q 1: What does T wave represent?
T wave represents: ventricular repolarization
Q 2: What is the normal direction and amplitude of T wave?
In general, T waves are in the same direction as the largest deflection of the QRS (normally the R wave).
Negative in AVR
Negative T waves in precordial leads V1, V2, V3 can be seen in normal, young athletes
Low T voltage changes may occur in the absence of any heart disease at all.
Q 3: What does abnormal T wave indicate?
T wave changes can be primary or secondary.
Primary T wave change refer to abnormal repolarization
Secondary T wave changes are caused by QRS changes. T wave changes caused by bundle branch block or ventricular hypertrophy are secondary.
Tall peaked T waves
Electrolyte imbalance = Hyperkalemia causes tall peaked T waves. overall maximum of 15 mV but this is not sensitive. T wave looks like an isosceles triangle.
Low voltage T waves
Hypokalemia causes low voltage T waves and prominent U waves. T waves less than 1mV in the limb leads and less than 2mV in the precordial leads.
low T voltage and sagging or flattened ST segments. these changes may occur in the absence of any heart disease at all.
Inverted T waves
