Cassano underwent heart operation

 　　ROME, Nov. 4 (Xinhua) -- Antonio Cassano underwent a heart surgery Friday morning to correct a congenital defect which was uncovered this week.

　　The procedure, which took around 30 minutes to complete, is understood to have gone according to plan, the football-italia.net said.

　　The Italian international has been in hospital since Saturday night after suffering an ischemic attack on the flight home from Milan's 3-2 win at Roma.

　　The 29-year-old subsequently underwent a series of tests after being admitted to the neurology wing of a Milan clinic.

　　During those investigations¹, it was discovered that the former Bari attacker would require surgery to fill a small hole between the atriums.

　　The operation was carried out by professor Mario Carminati.

　　It's expected that Cassano will be able to return to action, but that may not be for at least another six months.

1 investigations   

（正式的）调查( investigation的名词复数 )； 侦查； 科学研究； 学术研究

参考例句：

• His investigations were intensive and thorough but revealed nothing. 他进行了深入彻底的调查，但没有发现什么。
• He often sent them out to make investigations. 他常常派他们出去作调查。