Cardiff and Vale University Health Board is investing £2.4million to tackle surgical waiting lists.
The health board plans to increase the number of heart surgery procedures carried out each year to 1,000.
It hopes that number will rise to 1,300 with additional medical and nursing staff and cardiac intensive care beds.
Concerns were raised over surgical services at the board's hospitals last year. A team from the Royal College of Surgeons recently visit the University Hospital of Wales in Cardiff and noted that while there was substantial work to do, improvements had already been made.
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