Antoinette Sandbach AM fears for Betsi Cadwalaldr health staff morale
26 August 2013 Last updated at 17:50 BST
A north Wales AM has expressed her "surprise" and concern that a health board spent £50m on locum doctors and temporary medics from agencies.
Antoinette Sandbach said the "massive" figures were released by the Betsi Cadwaladr University Health Board after a Freedom of Information request.
She said the 2,571 locums hired between March 2010 and April 2013 raised concerns over patient care.
The health board has said it tries to minimise unnecessary expenditure.
But Ms Sandbach said she was worried for the impact of ongoing problems on staff confidence.