The former first lady of the United States, Barbara Bush was recovering after undergoing valve replacement surgery at The Methodist Hospital in Houston.
Former President George H.W. Bush, who was at her side, said the surgery went well.
In November, the former first lady had emergency surgery for a perforated ulcer at the same hospital, FOX News reported.
She had been admitted that time with abdominal pains and underwent routine, laparoscopic surgery.
Daughter of the publisher of McCall's magazine, Barbara Pierce, married George H.W. Bush in January 1945 when he returned a hero from World War II.
Barbara Bush and her husband spent four years in the White House, from 1989 to 1993. During that time, she disclosed she was suffering from an overactive thyroid ailment known as Graves' disease, which causes teary eyes and double vision.