Electrical alternans in ECG is characteristic of
Electrical alternans is an electrocardiographic phenomenon defined as an alternating amplitude or axis of the QRS complexes in any or all leads. It is most commonly associated with a large pericardial effusion and impending threat of cardiac tamponade Ref Davidson 23rd edition pg 467
Severe bronchial asthma
Pericardial effusion
Severe LVF
AR
C.V.S