Electrical Alternans is an electrocardiographic manifestation in which there is alternation in the amplitude of the QRS complex, the T wave alone, OR Both QRS and T wave.
It often accompanies fast rates and then has no prognostic significance.
When found with slow rates, it connotes organic heart disease with an adverse prognosis.
Electrical Alternans may occasionally be associated with a pericardial effusion and is usually seen in midprecordial leads.
Electrical Alternans does not cause a disturbance of rhythm.
