from CNN:

After suffering from mild heart pain over the weekend, Supreme Court Justice Anthony M. Kennedy was hospitalized for a “routine procedure” to keep an artery open, the court said.

Doctors inserted a stent Saturday to supplement a stent placed in the artery about 10 months ago. The associate justice was released from the Washington Hospital Center on Sunday and was back at work Tuesday.

A stent is a short, metal mesh tube used to keep arteries open. more

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I wish him well.  I can’t imagine Bush chosing another Justice to the Supreme Court.  Just thinking about it, I’m getting chest pain.