But Kevin McGrail, the neurosurgery chairman at Georgetown University Hospital in Washington, said the irregular heart beat that Fernandez suffers could complicate her recovery.
Fernandez's office has not released any details about any drugs she may be taking, but arrhythmia patients commonly take aspirin or other blood thinners, and these anti-coagulants would have to be stopped for her brain to heal. That in turn increases the risk of a stroke, so she'll need to be careful, McGrail said.
"If she's on a blood thinner, that would cause a whole other set of problems, and it would explain a lot of things, because she's a little young otherwise for a chronic subdural," McGrail said.
Many people cheered after the president emerged from surgery at the Fundacion Favaloro. Some had spent all night holding vigil, carrying statues of the Virgin of Lujan, Argentina's patron saint, and messages such as "Fuerza Cristina," urging her to show her strength.
Her spokesman, Alfredo Scoccimarro, did not answer questions after his brief announcement about her condition on the hospital steps.
Amid the messages of sympathy, critics questioned the secrecy surrounding her condition. The presidency still hasn't explained the head trauma on Aug. 12 that they said created the condition.
The day before her injury had been a rough day for Fernandez. Despite her intensive campaigning, primary election results that night showed a significant drop in support for her party's candidates ahead of the Oct. 27 congressional elections.
Boudou has apparently assumed control of the executive branch for an indefinite period, but the presidency didn't release the formal transfer-of-power document, and lawmakers are already debating how long he can remain in charge without an act of Congress.
Boudou said before the surgery that her top officials would run Argentina as a team "while she gets the rest she deserves."
Associated Press writers Almudena Calatrava and Debora Rey contributed to this report.
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