The move was retroactive to April 25. Right-hander David Carpenter was recalled from Triple-A Gwinnett in time for Tuesday night's game against the Washington Nationals.
Braves general manager Frank Wren said Ayala began feeling ill on the team's recent 10-game trip and was found to have high blood pressure. Wren said Ayala has been placed on medication to treat the high blood pressure and already is feeling better.
Atlanta acquired the 35-year-old from Baltimore on April 10 for minor league left-hander Chris Jones. Ayala was 0-1 with a 3.86 ERA in five games with the Braves, all in relief.
Carpenter did not appear in a game during a brief stay in Atlanta before he was sent back to Gwinnett on April 22.