TNN

New Delhi, Jan 23: Prime Minister Manmohan Singh may undergo heart surgery on Saturday. It is unlikely he will attend the Republic Day parade. 

The PM's surgery would be performed by a team of doctors from AIIMS, Mumbai and US.

Sources said that the doctors are yet to decide whether it would be an angioplasty or a coronary bypass surgery.

Earlier this week, the PM underwent extensive medical tests at the All India Institute of Medical Sciences (AIIMS).

An official PMO statement on Wednesday said the PM had undergone "diagnostic evaluation" and "treatment procedures which have been recommended would be undertaken in a few days". It was said on Tuesday that Singh was being given an overall medical check-up.

Doctors attending to the PM made it clear that he did not face any medical emergency. They said he was stable and did not face any physical discomfort during the tests. The doctors who conducted angiography - X-ray examination of the blood vessels or chambers of the heart through a small tube inserted into a blood vessel - on Singh also carried out multiple blood chemistry tests, CT scan and ECG. These tests are understood to have revealed arterial blockages in the heart.

Singh, 76, is a diabetic and has been controlling the condition with medicines and exercise like regular walking. He underwent a cardiac bypass surgery in 1990 in UK, and angioplasty in Delhi in 2004 in which stents were introduced in his arteries.