"Ghosh continues to be on ventilation. He is conscious, obeying simple commands, haemodynamically stable with low dose of ionotrops," a medical bulletin issued by the Apollo Hospital said.
He remains critical and prognosis remains guarded, it said.
A six-member medical board has been formed to monitor the health of the leader who was admitted yesterday following a lower respiratory tract infection.
Doctors fear a multi-system organ failure in the background of diabetes, Addison's disease, hypertension and acute kidney injury.
Ghosh took over as state secretary of Forward Bloc in the late 1940s and has been re-elected to the post for the past seven decades making him the longest serving leader at the post in any party.