Bill Clinton is resting comfortably after experiencing chest pains which sent him to the hospital

"President Clinton is in good spirits, and will continue to focus on the work of his Foundation and Haiti's relief and long-term recovery efforts," said adviser Doug Band said in a statement.

He is expected to stay the night at Columbia Campus of New York Presbyterian Hospital, where he was admitted earlier Thursday.

A hospital source said that Clinton called the head of cardiology at the hospital two days ago, saying that he was not feeling well. Clinton was originally scheduled to come in to the hospital Wednesday but postponed the appointment until Thursday due to inclement weather.

The visit to the hospital was considered routine, but in the course of the conversation between the former president and his cardiologists, it was decided that Clinton should undergo the procedure.

Stents are tiny mesh scaffolds used to prop open an artery after it is unclogged in an angioplasty procedure. Doctors thread a tube through a blood vessel in the groin to a blocked artery, inflate a balloon to flatten the clog, and slide the stent into place.

That is a different treatment from what Clinton had in 2004, when clogged arteries first landed him in the hospital. He underwent quadruple bypass surgery because of four blocked arteries, some of which had squeezed almost completely shut.

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