Naidu, who met doctors from the Apollo hospital, where she is admitted and those from AIIMS who have been called in to treat the AIADMK chief, briefed the Prime Minister on the latest health condition of the 68-year-old chief minister, sources said.
Jayalalithaa suffered a cardiac arrest late last night and is said to be in an "extremely grave" condition.
Naidu also met top leadership of AIADMK, including party legislators, during the day, sources said.