Rozanski J J, Kleinfeld M
Chest. 1976 Mar;69(3):424-5. doi: 10.1378/chest.69.3.424.
Gross pendular motion of the heart at half the heart rate was observed during cardiac catheterization and pericardiotomy in a patient with massive pericardial effusion and electrical alternans in the electrocardiogram. These observations support the hypothesis that total electrical alternans in pericardial effusion is a result of alternate change in cardiac position.
