Kumaraswamy, who had been admitted to Wockhardt Hospital following complaints of chest pain, had been diagnosed to be suffering from severe calcific arotic valve stenosis, necessitating an open heart surgery for replacement of the blocked valve of his heart, hospital sources said.

The four-and-half hour long surgery, which commenced at 9 am, was conducted by a team of eight doctors, headed by Dr Vivek Jawali.

"The surgery has gone well and has been uneventful," Dr Vishal Bali, CEO of the hospital, told PTI.

Kumaraswamy has been shifted to the intensive care unit where he will remain under observation for 48 hours. He will subsequently be shifted out of the ICU but will remain in the hospital for a week, informed Bali.

"All his parameters are fine," Bali said.

Kumaraswamy was admitted to the hospital on December 18 after he complained of chest pain.