WASHINGTON, July 12 (Xinhua) -- After an annual body check on Saturday, doctors found U.S. Vice President Dick Cheney's heart status remained stable.

    "All is fine," Cheney's spokesperson Megan Mitchell told reporters after the vice president took a two-hour routine checkup at the George Washington University Hospital. "The vice president's cardiac status remains stable."

    Cheney, 67, has been suffering from heart problems for a long time and had four heart attacks before.

    During his checkup in June, 2007, doctors found no new blockages in Cheney's heart, but replace a defibrillator, a special pacemaker to monitor heartbeat, that he has in his chest.

    In November, doctors had to administer an electronical shock to Cheney's heart to restore it to a normal rhythm after he had an irregular heartbeat.

    But in the Saturday's checkup, doctors did not find any recurrence of a trial fibrillation, or any arrhythmia with his defibrillator.