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Any doubts about Singh's health could undermine his re-election campaign, coming just as reports surface that Rahul Gandhi, heir to one of India's most powerful family dynasties, was emerging as his successor to lead the Congress party.
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The 76-year-old leader would be admitted to hospital on Friday, the prime minister's office said.Â
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Foreign Minister Pranab Mukherjee could take over prime ministerial responsibilities while Singh was recovering from the surgery, a foreign ministry official said.
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A general election is due by May this year and Singh was expected to continue as prime minister if the Congress coalition wins. The main battle is between the Congress-led government and a coalition led by the Hindu-nationalist Bharatiya Janata Party.
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The surgery could mean that Singh will not be able to carry out full vote campaigning. But the soft-spoken economist was never central to Congress's campaigning plans, analysts said.
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"He was never used much in campaigns. The Gandhi family and regional politicians continue to be more important," said Yashwant Deshmukh, head of C-voter polling agency.
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Singh underwent bypass surgery in 1990 in the United Kingdom. He also underwent wrist surgery in 2006, a prostate gland surgery and a cataract removal procedure last year, officials said.
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One expert said a new operation presented little risk for the prime minister.
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"There is one to two percent risk factor associated with a bypass surgery on a patient with a long history of cardiac problems like the prime minister," said Dr. T.S. Kler, head of cardiology at the Escorts Heart Institute & Research Centre Ltd.
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"Patients with similar case history such as the prime minister have undergone three bypass surgeries without any problem," he said. "It should take him 3-4 weeks to be fit again and resume normal duties."Â Â
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Indian shares extended losses after the news, with the benchmark BSE index <.BSESN> falling more than 1.5 percent before regaining some ground.