Prognosis

There is variable fertility in individuals affected by this condition. The long term prognosis is mainly determined by the cardiac problems. This may occur in up to 75% of cases and is the most common cause of death for people with the syndrome (1)

Hypertrophic cardiomyopathy may resolve, or may become rapidly progressive with a fatal outcome. There is some suggestion of late-onset arrhythmias and congestive cardiac failure (2)

Reference

1. Jorge AA, Malaquias AC, Arnhold IJ, et al. Noonan syndrome and related disorders: a review of clinical features and mutations in genes of the RAS/MAPK pathway. Horm Res. 2009;71(4):185-93.
2. Colquitt JL, Noonan JA. Cardiac findings in Noonan syndrome on long-term follow-up. Congenit Heart Dis. 2014 Mar-Apr;9(2):144-50.