"Gandhi visited the hospital this morning to enquire about Bardhan's health. She was briefed about Bardhan's condition by doctors attending on him," CPI national secretary D Raja, who was present at the hospital during the Congress President's visit, said.
Raja said Bardhan was "critical" but there is "slight" improvement in his condition.
"According to doctors treating him, he is stable and there is slight improvement in his condition. He is required minimal support from ventilator," the Rajya Sabha member added.
Ardhendu Bhushan Bardhan has been a leading figure of the trade union movement and Left politics in Maharashtra. He had won as an Independent candidate in the Maharashtra Assembly in 1957.