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A supporter of the AC Milan football club wears a jersey of the honorary president of the club Silvio Berlusconi, as he waits outside the San Raffaele hospital on June 14, 2016 in Milan. Italian former Prime Minister Silvio Berlusconi was undergoing cardiac surgery on Tuesday after a heart attack his doctor said could have killed the 79-year-old tycoon. "At 8:00am (0600 GMT) this morning, the operation to replace his aortic valve began," the San Raffaele hospital in Milan said in a statement. The surgery is expected to last for four hours and Berlusconi will be in intensive care for another two days, the hospital said. / AFP / GIUSEPPE CACACE (Photo credit should read GIUSEPPE CACACE/AFP/Getty Images)

A supporter of the AC Milan football club wears a jersey of the honorary president of the club Silvio Berlusconi, as he waits outside the San Raffaele hospital on June 14, 2016 in Milan. Italian former Prime Minister Silvio Berlusconi was undergoing cardiac surgery on Tuesday after a heart attack his doctor said could have killed the 79-year-old tycoon. 
"At 8:00am (0600 GMT) this morning, the operation to replace his aortic valve began," the San Raffaele hospital in Milan said in a statement. The surgery is expected to last for four hours and Berlusconi will be in intensive care for another two days, the hospital said.
 / AFP / GIUSEPPE CACACE        (Photo credit should read GIUSEPPE CACACE/AFP/Getty Images)