DMK chief Karunanidhi's health has deteriorated. Kauvery hospital in its latest medical bulletin says maintaining DMK patriarch's vital organs have been challenging and next 24 hours are going to be critical. Kalaignar has been receiving treatment at the Kauvery hospital since July 28 when his blood pressure dropped and he was rushed there. Leaders across political parties have been visiting the veteran leader, including President Ram Nath Kovind and Nitin Gadkari.