Former US President George H.W. Bush remains hospitalised near his home in Houston after experiencing shortness of breath this week but is said to be "doing well."
Mr Bush, 90, was taken by ambulance to Houston Methodist Hospital last Tuesday.
Spokesman Jim McGrath said yesterday that the 41st president's prognosis was positive and that he remained hospitalised as a precaution.
"He is still in the hospital and still doing well," Mr McGrath said in an emailed statement.
The latest health scare comes two years after Mr Bush, who was president from 1989 to 1993, was admitted to the same hospital for treatment of bronchitis and related ailments.
Mr Bush spent seven weeks recuperating and became so ill he was believed at one point to be near death.
The former Republican president suffers from Parkinson's disease and cannot use his legs.
But he celebrated his 90th birthday on 12 June by skydiving in Kennebunkport, Maine, with the Army's Golden Knight parachute team.
His eldest son, former President George W. Bush, this year published a best-selling book about his father, titled "41 - A Portrait of My Father."