Sign for NHS Ayrshire and Arran's Ailsa Hospital and University Hospital Ayr
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NHS Ayrshire and Arran critical incidents investigated

23 February 2012 Last updated at 10:57 GMT

BBC Scotland has revealed NHS Ayrshire and Arran tried to avoid publishing documents relating to more than 20 deaths amongst its patients.

They include three missed chances to diagnose cancers, and two cases where psychiatric patients murdered or tried to murder relatives.

BBC Scotland's health correspondent Eleanor Bradford has this exclusive report.