The health condition of former West Bengal Chief Minister Buddhadeb Bhattacharya, who was admitted to a hospital in south Kolkata, deteriorated to "very critical" on Wednesday (December 9) evening.

According to hospital sources, the health condition of the former West Bengal CM improved a bit on Thursday (December 10) morning but remained 'critical'.

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A five-member team of doctors will be reviewing his condition at around 10 am to decide on the next course of treatment, they said.

A doctor treating Buddhadeb Bhattacharya said, “His health condition has improved a bit. He is also maintaining a steady PCO2 level and the reading of which is at 42 this morning. This is normal for COPD patients.”

“He is on ventilator support and his condition remains critical,” he added.

Bhattacharya, 76, was put on mechanical ventilator support at the critical care unit of the private hospital where he was admitted on Wednesday afternoon as his breathing-related problems aggravated.

Bhattacharya tested negative for COVID-19 but the CT scan of his brain showed old lacunar infarcts.

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The veteran CPI(M) leader was initially put on non-invasive ventilation (BIPAP) at the hospital after which his oxygen saturation improved to 95 percent.

Bhattacharya, who was the chief minister of West Bengal from 2000 to 2011, has been suffering from COPD (chronic obstructive pulmonary disease) and other old age-related ailments for quite some time. He has been away from public life for the past few years due to his health.