According to a press release issued by the ruling Croatian Democratic Union (HDZ), as soon as he was admitted to the hospital, Seks underwent surgery which included the opening of an artery and placing a stent to hold the artery open.
The condition of the Sabor Speaker is now satisfactory, the press release says adding he will remain at hospital for a few days to recover.
The hospital head, Zeljko Reiner, was quoted by the national television (HTV) as saying that Seks had recognised symptoms of the initial heart attack on time and he was transferred to the hospital within several minutes.
Prime Minister and the HDZ chief Ivo Sanader who visited his party colleague confirmed to reporters on Wednesday evening that Seks was feeling well after the surgery.