Dikshit, 74, was admitted to Fortis Escorts Heart Institute last night after she complained of tiredness, cold and throat infection.
She underwent an angioplasty at the hospital today as blockage was found in one of her arteries, sources said.
Angioplasty is a non-surgical procedure which is performed for widening blocked arteries and improve blood circulation.
The sources said an overall health check-up was also carried out on Dikshit.
The Chief Minister cleared a number of files from the hospital bed. She is likely to be released from hospital on Wednesday.