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(Chest. 1971;59:341-344.)
© 1971 American College of Chest Physicians

Electrical and Mechanical Alternation in Pericardial Effusion

George E. Gabor M.D.1; Fred Winsberg M.D.1; and Henry S. Bloom M.D.1

1 Departments of Medicine and Radiology, Albert Einstein College of Medicine, Lincoln Hospital, Bronx, New York

In a case of traumatic pericardial effusion with electrical and mechanical alternation, ultrasonic cardiography demonstrated excessive oscillatory motion of the heart. This motion occurred in both anteroposterior and left-to-right directions. The frequency of the motion was half the pulse rate and thus readily explains the electrical alternation. Pericardiocentesis abolished both of these phenomena.




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