Former Tamil Nadu chief minister M Karunanidhi’s health condition has declined, the hospital treating him in Chennai said on Monday, adding that maintaining his vital organ functions continued to be a challenge due to his age.

The DMK chief’s response to “medical interventions over the next 24 hours” will determine his prognosis”, Dr Aravindan Selvaraj, executive director, Kauvery Hospital, Chennai said in a health bulletin.

Karunanidhi, 94, was shifted to the hospital on July 28 after being treated at his home in Chennai’s Gopalapuram for fever and urinary tract infection.