Injury marks were also found on the body of 52-year-old Pushkar, who was last night found dead in mysterious circumstances in luxury Leela Palace hotel in South Delhi.
The head of the three-member panel of doctors that conducted the autopsy on Pushkar, said, "We have conducted the postmortem examination... It is a case of sudden, unnatural death" but ruled out poisoning.
"We have completed the whole procedure. Samples for toxicological analysis means ruling out any poison. Some pathology of the heart has been preserved by us," he said.
Pushkar was found dead in her suite at the hotel and the body was shifted to AIIMS at around 3:30 AM for post-mortem.
Police is also expected to record statement of Tharoor, who was admitted to AIIMS following complaints of chest pain and was discharged later.
Pushkar and Tharoor were at the centre of a raging controversy when reports emerged that she was upset over reported text and tweet messages between her husband and Mehr Tarar, a Pakistani journalist.