Her health condition deteriorated on Thursday following her breathing problems since Wednesday night.
Sen has been put under non-invasive ventilator support. However, her cardiac condition continues to remain stable, reports said.
Meanwhile, West Bengal Chief Minister Mamata Banerjee visited the hospital again on Thursday to inquire about Sen's health condition.
The 82-year-old actress was shifted from a general bed to critical care unit (CCU) late on Dec 29 night.
--IBNS (Posted on 10-01-2014)