Only 'low and medium complexity' surgeries are being carried out at Scotland's dedicated centre for adults born with a heart condition.
In April last year the board that runs the Golden Jubilee Hospital in Clydebank identified "outcomes that fall below the high standards within our Scottish Adult Congenital Cardiac Service (SACCS)."
In response, the hospital commissioned an internal review and commissioned an external independent peer review in parallel.
The health board said that to date, 14 patients "have chosen to receive surgery in England " supported by arrangements designed to maintain continuity of care and minimise disruption for patients and families.
The board said it is currently awaiting a final response from the external review.
A spokesperson added: "During the ongoing review period, selected low and medium complexity surgeries for SACCS patients continued at NHS Golden Jubilee
"Work is continuing to ensure all improvements are delivered to support the safe return to a full surgical service as soon as possible, with 66% of the agreed actions completed and the remainder on track.
"As an organisation committed to continuous improvement and open communication, the findings from the review will be presented first to the NHS Golden Jubilee Clinical Governance Committee.
"We are also committed to ensuring that SACCS patients and their families receive this information directly from us before it is shared publicly or through the media.
"This approach ensures full transparency, appropriate clinical oversight and respect for those most directly affected."
The health board said the review has already led to a series of "whole service improvements".
This includes "building a more resilient surgical team, improving scheduling, enhancing collaboration between adult and children’s services, and supporting additional training and education for staff."
The board said most other essential services for SACCS patients have continued without interruption.
This includes patient assessments, diagnostic investigations, a range of cardiac catheterisation laboratory procedures, and the treatment of heart‑rhythm disorders.
There are approximately 18,240 adults (age 16 and over) with congenital heart disease (CHD) and around 10% are deemed to have complex conditions.
Historically, very few children survived to adulthood but outcomes for patients have been transformed by diagnostic and treatment advances over the last few decades. However patients require life-long care and repeat and complex surgical interventions.
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