CARACAS (Reuters) - Venezuela's Hugo Chavez suffered unexpected bleeding caused by a six-hour cancer operation in Cuba, the government said, although the ailing president's condition began to improve on Thursday.
The 58-year-old's health has deteriorated dramatically since he won re-election two months ago, casting doubt on the future of his "21st century socialism" project, which won him huge support among the poor but infuriated adversaries who denounce him as a fledgling dictator.
Officials said Chavez's medical team in Havana had to use "corrective measures" to stop the bleeding which resulted from Tuesday's surgery, his fourth cancer operation in 18 months. But they said his condition had improved since then.
"In the last few hours, his process of recovery has evolved from stable to favorable," Vice President Nicolas Maduro told a rally of Socialist Party supporters, who cheered as he spoke.
"That allows us to continue saying that there is a growing recovery in Comandante Hugo Chavez's situation."
The president claimed he was cured earlier this year, and was able to campaign for re-election in October, but now looks to be fighting for his life again. Officials have stressed that his post-operation process will be long and complex.
The ashen faces of cabinet ministers and somber tone of their terse official statements since Tuesday's surgery appeared to suggest top government officials are preparing for the worst.
The president has refused to divulge details of the cancer that was diagnosed in June of last year.
He won re-election by a big margin in October and is due to start a new six-year term on January 10. According to the constitution, if he is unable to do so or steps down after starting a new term, an election must be held within 30 days.
On Saturday, Chavez anointed Maduro as his heir apparent in case he had to step down - the first time since he took office in 1999 that he has named a successor.
The 50-year-old Maduro, a former union organizer and loyal Chavez disciple who is seen as a pragmatic moderate, would be the ruling party's candidate.
'FATHERLAND IS SAFE'
The president of Uruguay, Jose Mujica, said he planned to visit Chavez in Cuba, and Venezuelans held vigils and gathered in plazas to pray for their president's swift return.
State TV launched a spot that opens with Chavez's voice thundering "I am no longer myself, I am the people," followed by Venezuelans of all ages telling the camera: "I am Chavez."
Another shows short clips of Chavez singing folk songs with supporters and reciting poetry. One rally for a "Chavista" candidate in Sunday's regional elections kicked off with a recording of the president singing the national anthem.
The Information Ministry published a document with the words "Loyalty to Chavez - The fatherland is safe" over a picture of Chavez and Maduro sitting below a painting of liberation hero Simon Bolivar. Chavez is shown holding an ornate golden replica of Bolivar's sword.
Senior government officials have begun cautiously preparing people for the reality that Chavez may not survive.
"At the same time as we pray, we should be ready to turn our sadness and pain into a force that can mobilize the people," Aristobulo Isturiz, a top ally of the president, told a rally of red-clad supporters.
Even if he dies, Chavez is likely to cast a long shadow over Venezuela's political landscape for years - not unlike Argentine leader Juan Peron, whose 1950s populism is still the ideological foundation of the country's dominant political party.
Elections shortly after the Venezuelan leader's death could create an awkward scenario for the opposition. Campaigning on day-to-day concerns such as crime and inflation would be difficult in such an emotionally charged atmosphere.
The implications of Chavez's illness go far beyond Venezuela. Regional allies, most notably Cuba, have for years relied on him for subsidized oil and fuel shipments.
It could also slow the resurgence of the left in Latin America and weaken a global "anti-imperialist" alliance stretching as far as Syria and Iran that has sought to undermine the influence of the United States.
Energy companies are keenly watching events and hope a change in government will lead to greater access to the country's vast crude oil reserves - the world's largest. Years of combative state takeovers have alienated major oil companies.
Investors who pack their portfolios with Venezuelan bonds, among the highest-yielding and most widely traded emerging market debt, are hoping for more fiscal responsibility after a year of blowout campaign spending.
Venezuela's opposition has begun discussing which candidate they might field in a new presidential election.
Henrique Capriles, a state governor who lost to Chavez in October but galvanized the opposition with a nationwide house-to-house campaign tour, is the obvious choice to face Maduro.
But he may not be able to count on the support of all the 20 or so parties that make up the opposition's coalition, some of which are anxious to field their own candidate. The opposition hopes to retain its seven state governorships out of 23.
The key will be whether Capriles can win re-election on Sunday as governor of Miranda state, where he faces a challenge from Elias Jaua, a Chavez protege and former vice president. If Capriles loses, half a dozen opposition figures could emerge as possible candidates for a new presidential election.
The polls in Miranda are mixed, with one showing Capriles way ahead and another giving Jaua a 5 percentage point lead.
Rallies for Socialist Party candidates ahead of Sunday's vote have become mass vigils for the president's health.
"We have a great chance to win all 23 governorships. That would be the best support we can give Chavez," the president's brother Adan, who is running for re-election in Barinas state, told a rally.
(Editing by Kieran Murray and Todd Eastham)
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