"His health is stable and we are satisfied. We will decide in the evening whether to discharge him on Friday or keep him for one more day," AIIMS spokesperson Shakti Gupta told PTI.
Vajpayee was admitted to a private ward in the Cardio-Thoracic and Neuro-Sciences Centre of AIIMS after he complained of drowsiness and giddiness two days ago.
A team of doctors, including a cardiologist and neurologist, are looking after him.
"He is still under observation, but is much better. All his vital signs are normal," Shakti said adding that reports of all the tests, including MRI, are ok.
"He is stable. His pulse and blood pressure is stable," the spokesman said, adding, "We are keeping him in hospital to complete all our investigations".
Prime Minister Manmohan Singh visited the 83-year-old BJP leader on Wednesday.
Among those, who visited the ailing leader, were former deputy Prime Minister L K Advani, Health Minister Anbumani Ramadoss, former Vice-President Bhairon Singh Shekhawat and Chief Ministers of Madhya Pradesh Shivraj Singh Chouhan and Gujarat Narendra Modi.
External Affairs Minister Pranab Mukherjee had also visited Vajpayee the day he was admitted in the hospital.
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