New Delhi, Jan. 24 : The by-pass surgery on Prime Minister Manmohan Singh has been successful and his condition is stable.

"Dr. Singh was transferred to the Intensive Cardiac Care Unit (ICCU) after the operation at 8.55 pm," PMO spokesperson Deepak Sandhu said today.

"The operation was successful and there is nothing to worry about. His condition is stable. He will be kept in the Intensive Cardiac Care Unit for 48 hours for observation," Dr Sudhir Vaishnav, cardio-vascular thoracic surgeon with Asian Heart Institute (AHI), Mumbai, said.

"Dr. Manmohan Singh is expected to regain consciousness sometime tomorrow. He is likely to be in the AIIMS for next eight days," said a PMO official.

Earlier, External Affairs Minister, Pranab Mukherjee told media, "Doctors are confident that Prime Minister is recovering well after surgery."

A team of doctors led by surgeon Ramakant Panda and assisted by AIIMS doctors on Saturday successfully performed a redo (repeat) bypass operation on Prime Minister Manmohan Singh.

The operation was carried out by a team of 11 senior cardiac specialists, and was led by Dr. Ramakant Panda, a highly reputed cardiac surgeon from the Mumbai-based Asian Heart Institute.

Dr. Singh was admitted into the AIIMS on Friday afternoon after he complained of chest pain and fatigue.

Dr. Singh had undergone a cardiac bypass surgery in 1990 in UK, and angioplasty in Delhi in 2004 in which stents were introduced in his arteries.

Grafts, which were used to bypass the diseased vessel on Dr. Singh 18 years ago, had once again started to narrow. (ANI)