The 82-year-old actress has been put on BIPAP therapy through an endotracheal tube to control her oxygen saturation level in blood, a medical bulletin issued by the Belle Vue Clinic, where she is admitted since December 23, said.
Her low food intake has made her weak, the doctors said, adding they have intensified her nutrition therapy and are feeding her through an intravenous tube.
"A patient who is in the ITU (Intensive Treatment Unit) and on constant oxygen support cannot be stated to be out of danger," critical care specialist Dr Subarata Maitra told reporters.
In conscious condition now, the veteran actress has also been examined by Dr Dhiman Ganguli, Dr Pawan Agarwal and Dr Sunil Baran Roy. Besides, senior physician Dr Sukumar Mukherjee was also consulted by the medical board led by Dr Maitra.
Some members of the medical team are staying overnight at the super-speciality hospital to monitor the health of the actress. Sen's daughter Moon Moon has also been staying at the hospital for long hours.
Security cover was increased at the hospital by the Kolkata Police as anxious fans gathered outside.
Sen was the first Indian actress to win the best actress award internationally at the Moscow Film Festival. She had starred in memorable Hindi films like 'Devdas', 'Aandhi' and 'Saat Paake Bandha', 'Agnipariksha', 'Saptapadi' and 'Deep Jwele Jai' in Bengali.
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