Kolkata: The condition of 95-year-old Communist Party of India (Marxist) patriarch and former West Bengal chief minister Jyoti Basu improved marginally on Sunday, although he continued to remain critical, doctors attending to him said.

“His general condition is marginally better than yesterday (on Saturday), but still critical and he is on partial ventilation," executive director of private Advanced Medicare and Research Institute Ltd hospital, D.N. Agarwal, said.

“His central nervous system is better in comparison to (how it was) yesterday (on Saturday) and his cardiovascular system is more or less stable," Agarwal said.

Basu’s blood pressure was being maintained with a minimum dose of stabilizing drug Ionotropes and his lungs were showing some signs of improvement.

“Infection is being adequately treated," he said.

Basu’s urine output has picked up and no dialysis was necessary at the moment, he said.

The doctors treating the Marxist leader are constantly keeping in touch with specialists at the All India Institute of Medical Sciences.

Recovering: Former West Bengal chief minister Jyoti Basu. Though his health has marginally improved, he continues to remain critical. PTI

He was on 7 January visited by Prime Minister Manmohan Singh and finance minister Pranab Mukherjee, who had flown in from New Delhi to inquire about the Left leader’s health. On 6 January, Basu was put on a ventilator after his condition deteriorated. A bronchoscopy was also carried out.

Throughout his stay in the hospital, Basu’s condition has been improving and deteriorating at random intervals, often requiring external oxygen and ventilator support.

Railway minister Mamata Banerjee, West Bengal chief minister Buddhadeb Bhattacharjee, West Bengal’s ruling Left Front chairman Biman Bose and former Lok Sabha speaker Somnath Chatterjee have also visited the ailing leader.