More families have been told by a health board that their relatives' deaths may have been linked to treatment by vascular services.
Betsi Cadwaladr University Health Board (BCUHB) has written to families who were part of a review after concerns were raised last year.
Four cases had already been reported to a coroner and the health board says it has been "very open" with relatives of other patients.
The service has recently been described by inspectors as making "satisfactory progress", but the health board admit it is still on a "long journey".
A report by the Royal College of Surgeons England (RCSE) in January 2022 found risks to patient safety due, in part, to poor record keeping.
It recommended to the health board that it investigate fully what happened to the 47 patients its report focused on.
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Source: BBC News, 13 July 2023