Dikshit, 74, was admitted the Fortis Escort Heart Institute yesterday, ten days after she underwent an angioplasty procedure at the same hospital following blockage in one of her arteries.
The Chief Minister had rejoined office on Monday and had left for Gujarat next day to release Congress' election manifesto for the assembly polls in the BJP-ruled state.
A close aide of Dikshit said she has was doing fine but doctors have advised her rest for the next couple of days.
About apprehension whether she would be able to participate in the coming winter session of Delhi Assembly beginning Tuesday, her Parliamentary Secretary Mukesh Sharma said she would definitely lead the government in the House from the very first day.
The Chief Minister is likely to be released from the hospital tomorrow.