Samsung Electronics Chairman Lee Kun-hee remained under sedation at Samsung Medical Center (SMC), Wednesday.
"No changes from Tuesday," said an SMC official.
"His temperature is normal and his heart is functioning properly," the official added.
The 72-year-old business tycoon experienced trouble breathing Saturday night and was immediately sent to a hospital near his house in Hannam-dong.
Meanwhile, Samsung Future Strategy Office Head Choi Gee-sung asked chief executives at Samsung Group of affiliates not to be distracted.
Choi, who is considered as the right-handed man to Samsung heir Lee Jae-yong, declined to comment further on repeated questions from reporters about the health of the chairman.
Samsung officials said Jae-yong is updated on his father's condition on a real-time basis, while the chairman's wife Hong Ra-hee and two daughters — Hotel Shilla CEO Lee Boo-jin and Samsung Everland President Lee Seo-hyun — have been staying by his side since Sunday.