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

Dr. Singh has been transferred to the Intensive Cardiac Care Unit (ICCU) after the operation.

"The operation was successful and there is nothing to worry about. His condition is stable. He has been moved to the Intensive Cardiac Care Unit (ICCU)," an All India Institute of Medical Sciences (AIIMS) source said here.

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.

It lasted for more than seven hours.

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)