Peru's former President Alberto Fujimori was rushed from his prison cell to a hospital Saturday.
His doctor, Alejandro Aguinaga said Fujimori suffered a sudden drop in blood pressure and had an irregular heartbeat. He has been admitted to the hospital before for displaying the same symptoms.
"He is a little frail," Aguinaga said. "It is a little complicated."
Fujimori, who is 79 years old, is serving a 25-year prison sentence for human rights violations, corruption and the sanctioning of death squads during his 1990 - 2000 presidential term.
Fujimori, who has been imprisoned since 2005, would be 93 when released, if he serves his full prison term.
He has requested three pardons, but they have all been rejected because doctors said the former leader was not terminally ill and did not suffer a severe mental illness.
Under Peruvian law, no one can receive a presidential pardon if convicted of murder or kidnapping., unless suffering from a terminal illness.
Peruvian President Pedro Pablo Kuczynski said earlier this year he would make a decision by the end of the year about granting Fujimori a medical pardon.
Kuczynski said a pardon for the former leader would not be a pardon for his crimes, but would instead be based on the recommendations of Fujimori's doctors.
Keiko Fujimori, the former president's daughter, narrowly lost Peru's last presidential election to Kuczynski.