Isakson back in hospital

Johnny Isakson

Johnny Isakson

ATLANTA -- U.S. Sen. Johnny Isakson is back in the hospital.

Isakson was admitted to Piedmont Hospital in Atlanta on Monday night after doctors found an irregular heartbeat during a routine appointment to check Isakson's progress in recovering from a bacterial infection.

Spokeswoman Joan Kirchner said doctors also later found a blood clot in his right calf that developed as a result of Isakson being sedentary for the past week while recovering from the infection.

Physician Steven Marlowe, who treated Isakson last week at Northside Hospital for the infection, said he decided to refer Isakson to his cardiologist during a check-up visit Monday.

The 65-year-old Republican was hospitalized for four days last week.