Tall R in V1 Differential?

My CCU attending asked me to, if nothing else, remember 3 causes of a tall R wave in V1. In my diligence I have indeed remembered nothing else. What’s in your differential?  

March 2015
M T W T F S S
 1
2345678
9101112131415
16171819202122
23242526272829
3031  

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