Electrical alternans with sinus tachycardia is a highly specific sign for large pericardial effusion.
2.
Her electrocardiogram showed small spikes that alternated in shape _ a classic sign of cardiac tamponade called electrical alternans.
3.
Generally electrical alternans can be seen with tamponade, and narrow AV junctional reenterant tachycardia with an accessory pathway ( such as WPW syndrome ).
4.
In such cases of cardiac tamponade, EKG or Holter monitor will then depict electrical alternans indicating wobbling of the heart in the fluid filled pericardium, and the capillary refill might decrease, as well as severe vascular collapse and altered mental status due to hypoperfusion of body organs by a heart that can not pump out blood effectively.
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