The 'Frasier' star - who was hospitalised two months ago after having a heart attack - was kept in the medical centre overnight because doctors were worried about his irregular heartbeat which he has had since taking medication following the attack.

Kelsey's representative said: "He felt a little faint. The doctors think there needs to be a change in the medication, so they are going to keep him overnight to observe."

After his hospitalisation on June 2, the 53-year-old actor - who is in New York promoting his new movie 'Swing Vote' - explained doctors had to use a defibrillator to revive him after the near-fatal incident.

He said: "It actually wasn't very mild. They had to blast me twice and get me started all over again."

Father-of-four Kelsey added in the interview he was "doing fine". Kelsey stars in 'Swing Vote' alongside Kevin Costner and Dennis Hopper.