Speaking to reporters, Dr Sushrut Banerjee said, "Basu's condition is very critical. His oxygen requirement has been further increased although he was put on haemo-dialysis for two hours last evening."
He said Basu's cardiac and renal functions had not shown any improvement.
"Basu will be put on haemo-dialysis again this afternoon for another two hours if his health permits," he said.
Doctors have already increased the dose of 'Ionotropes' to stabilise his blood pressure, he added.