Electric alternans is seen in: (A) Cardiac tamponade, (B) Restrictive cardiomyopathy, (C) Constrictive pericarditis, (D) Right ventricular infract
Answer is A. Rrf Harrison 19 th ed pg 1573 There may be reduction in ampli- tude of the QRS complexes, and electrical alternans of the P, QRS, or T waves should raise the suspicion of cardiac tamponade . the features that distinguish acute cardiac tampon- ade from constrictive pericarditis.