DMK sources said Duraimurugan, who is also the Deputy leader of the Opposition in the Assembly, came to the airport to board a flight to Madurai. He was heading to Madurai to campaign for the party’s candidate in the Tiruparankundram assembly by-poll on November 19. Suddenly, he fell unconscious, following which he was rushed to Apollo Hospitals for treatment.DMK sources said he was suffering from low blood pressure and that his condition was stable.