Got a new pt to the unit, and noticed them going in and out | Figure 1

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Got a new pt to the unit, and noticed them going in and out of this rhythm. I know, I know, I need a 12-lead. Well, this is what I have until tomorrow. Electrical alternans, which I know that, accompanied by tachycardia, usually means Tamponade. However, HR here is 71. 6XyoF admitted with sepsis and #Hypotension - what are some other things that could cause this? In other leads, I could see the high-low-high QRS pattern as well.

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