Gordon Clark was at Holyrood today to listen to First Ministers Questions where Ms Sturgeon was urged to apologise to him by Labour leader Richard Leonard. It came after e closure of the children's ward at the Royal Alexandra hospital in Paisley was confirmed last week.
Mr Clark also hit out at local MP Mhairi Black over her failure to lobby Ms Sturgeon for it to be saved.
The campaigner raised the issue during a debate hustings on the BBC during the Holyrood election campaign of 2016, but Ms Sturgeon told him at the time there were no plans to close the ward.
The 57-year-old said after First Minister Questions today that Ms Sturgeon had misled locals to win the election.
"That's all it was about and the fact that she was prepared to lie for gain at the election, I think is totally disgusting."
Ms Black criticised the decision in her newspaper column this week, but Mr Clark also hit out at the MP's approach.
"If Mhairi Black has said that, then why has she not put pressure on the First Minister, why is she not coming out in local papers and really pushing for it.
"If she really believes that, and if Mhairi Black says that, then I need to applaud the fact that hopefully she's seeing it's not just about the clinical side, it's about the whole holistic approach and how important wards are, especially for children and young people."
The decision to close the hospital was confirmed by Health Secretary Shona Robison last week.
The First Minister insisted today said that no formal proposals had been made to ministers to close the ward and these only came forward a year after the TV debate.
Ms Sturgeon told MSPs that closing the ward was the "most difficult decision" that the Health Secretary has had to make.
She said the decision was "based on clinical evidence" and added that the paediatric clinicians at the hospital said this week that change will help ensure high quality health care is delivered to children.
"As this matter moves forward, the interest and the health of children will be absolutely paramount at every stage."
19 hospital wards and NHS units across Scotland face cutsShe later came under fire from Liberal Democrat who accepted that medical experts had advised against the closure of the ward.
But he added: "They did not force her to lie in that TV debate."