Doctors at AIIMS, who requested not to be named, told The Telegraph that an ultrasound scan performed on the minister when he was brought to the AIIMS did not show any internal bleeding.

However, the post-mortem analysis has revealed injuries to his chest and liver. The doctors said it is possible these injuries might have been caused during the attempts to revive Munde.

The standard procedure for cardiopulmonary resuscitation -- intended to get a silent heart to spontaneously start beating again -- involves compressing the chest 100 times per minute. The trauma centre protocols call on doctors to try to resuscitate for at least 30 minutes. The doctors continued to try to resuscitate Munde for an additional 20 minutes.

The 50-minute resuscitation attempt could have exposed Munde's body to nearly 5,000 chest compressions which could have led to the injuries to the chest and liver observed in the post-mortem analysis, doctors engaged in the resuscitation attempts said.

But these likely post-mortem injuries in the chest and liver were not serious and could have been easily managed if cardiac activity had been revived, a senior doctor said.