"He continues to remain critical. Doctors are trying their best," CPI national secretary D Raja said today.
Besides leaders from the Left party, NCP chief Sharad Pawar had visited the GB Pant Hospital, where the 92-year-old leader is being treated, yesterday.
"His daughter and grandson too are in the city to be by his side," senior CPI leader Atul Anjan said.
Bardhan, who lives in the CPI Headquarters here, lost consciousness yesterday and was immediately rushed to the hospital.
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Bardhan has been a leading figure of the trade union movement and Left politics in Maharashtra and had won as an Independent candidate in the Maharashtra Assembly in 1957.
He later rose to become the General Secretary and then the President of the All India Trade Union Congress, the oldest trade union in India.
Bardhan moved to Delhi politics in the 1990s and became the Deputy General Secretary of the CPI. He succeeded Indrajit Gupta as the General Secretary of the party in 1996.