Counsel new parents given a postnatal diagnosis of Noonan syndrome — OSCE

Candidate brief

You have eight minutes to counsel the parents of a two-day-old infant given a postnatal diagnosis of Noonan syndrome. The diagnosis is confirmed on clinical grounds and a multigene RASopathy panel has identified a PTPN11 variant. Use a structured, honest, empathic, strengths-based approach. [1] [2]

Key teaching and communication objectives

Acknowledge and validate the parents' grief and fear before delivering information, and allow silence. Explain that Noonan syndrome is a genetic condition caused by a change in a single gene in a signalling pathway called RAS/MAPK, that this pathway is important for development before birth, and that the change produces a recognisable pattern of features including the facial appearance their baby has, short stature, and a heart difference. Explain that a multigene panel was used rather than testing a single gene, because several genes in the pathway can cause the same condition and the specific gene helps guide the care plan. [1]

Outline the plan in plain language: an echocardiogram, which is an ultrasound of the heart, to be done by six weeks of age, because around half of babies with Noonan syndrome have a heart difference and some have no murmur; a blood test to check for a bleeding tendency before any procedures; growth monitoring using special Noonan syndrome growth charts; and developmental support through early intervention. Emphasise that the surveillance plan is designed to find and treat complications early, and that most children with Noonan syndrome attend mainstream school with support and live full lives. [2]

Address the online information honestly and with a strengths-based frame: Noonan syndrome is one of the commonest genetic causes of congenital heart disease, the heart differences are treatable, intellectual disability is usually mild or absent, and growth hormone therapy can improve adult height. Avoid deficit language, name the child by their name rather than the diagnosis, and frame the conversation around the person rather than the syndrome. [3]

Close with a shared plan and a clear next appointment, a connection to a Noonan syndrome support organisation and to early intervention services, and an open invitation to return with questions. Offer to test both parents for the gene change, because if one parent carries it, the recurrence risk for future pregnancies is fifty per cent, and if neither does, it is approximately one per cent. [1] [2]