Sen. Mike Duffy is recovering in an Ottawa hospital after undergoing open-heart surgery earlier today.
It is the second such procedure for the embattled independent senator, the first having taken place in 2006.
Dr. Marc Ruel, chief of the cardiac unit at the University of Ottawa's Heart Institute, conducted the surgery to clear up blocked arteries.
Duffy was suspended from the upper chamber last month as part of an ongoing controversy over disputed living expenses.
He is also the subject of an RCMP investigation into his repayment of $90,000 in expenses, and an alleged deal with the Prime Minister's Office that was to see him reimbursed by a third party. No charges have been laid.
The former television broadcaster took to the Senate floor in October on two occasions to fight back against his suspension, alleging he was the victim of threats and coercion by the prime minister's staff and key senators.