Concerns related to corporate governance have arisen at one of the country's leading patient advocacy services, Patient Focus, RTÉ Investigates has learned.

It has also emerged that all current board members, bar one, have resigned from the charity.

In a statement, the Health Service Executive has confirmed it is working with Patient Focus to address some corporate governance issues and to ensure strong board oversight is in place.

"The HSE is currently assessing the best way to ensure the work of Patient Focus continues and that a strong independent advocacy service is available to those who need it."

Patient Focus - which was founded in 1999 - rose to prominence at the time of the Dr Michael Neary caesarean hysterectomy scandal in Drogheda, Co Louth.

At that time Patient Focus supported more than 100 women who underwent unnecessary operations at the hands of the disgraced former obstetrician and gynaecologist.

It has since provided support to hundreds of other patients and their families affected by some of the country's most high profile healthcare controversies.

In its statement, the HSE said Patient Focus would continue its work and funding for the charity will remain in place.

It is understood the HSE will appoint an interim manager to the charity and a new board will be formed shortly.

RTÉ made several unsuccessful attempts to contact Patient Focus for comment.