Former U.S. first lady Barbara Bush has been released from a Texas hospital, just over a week after undergoing open heart surgery.

Mrs. Bush underwent a two-and-a-half-hour procedure on March 4 at The Methodist Hospital in Houston to replace an aortic valve.  She was released from the facility Friday.

The aortic valve typically hardens with age.  Symptoms of aortic valve disease include shortness of breath, dizziness and chest pain.  If left untreated, it can result in heart failure.

Mrs. Bush, who is the wife of former president George H.W. Bush, is expected to fully recover.  Mrs. Bush is the mother of George W. Bush, the two-term U.S. president who left office in January.  

Mrs. Bush underwent surgery in November for a perforated ulcer.  Doctors said the heart surgery was not related to the earlier surgery.