The patient was reported to have suffered from cardiac arrest and had gone conscious onboard, said Ejaz Shami, deputy general (communication) of KIMS-Kingsway Hospital, which has its ambulance stationed at the airport for handling medical emergencies.

from Times of India https://timesofindia.indiatimes.com/city/nagpur/pune-bound-indigo-flight-makes-emergency-landing-in-nagpur-as-73-year-old-passenger-suffers-cardiac-arrest-brought-dead/articleshow/98731042.cms