Commons Speaker Michael Martin has undergone a heart operation and will be absent from Westminster for a few weeks, his office has said.
The 60-year-old had an angioplasty procedure, where a tiny balloon is used to open a narrowed coronary artery.
Mr Martin, who is now "recovering well" at home, was admitted to Glasgow Royal Infirmary on 17 February after suffering chest pains.
The Labour MP for Glasgow North East became Speaker in 2000.
His duties, which include chairing debates in the Commons, will be taken on by deputies Sir Alan Haselhurst, Sylvia Heal and Sir Michael Lord.
Mr Martin served as deputy Speaker to Betty Boothroyd before being elected to his current role, and has been a Labour MP since 1979.
Before entering politics he was a sheet metal worker and a union official.
(BBC)
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