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. 2021 Jul:234:134-141.e5.
doi: 10.1016/j.jpeds.2021.03.050. Epub 2021 Mar 29.

The Prevalence of Noonan Spectrum Disorders in Pediatric Patients with Pulmonary Valve Stenosis

Janet M Bell  1 , Ellen M Considine  2 , Leslie M McCallen  1 , Kathryn C Chatfield  3
Affiliations

The Prevalence of Noonan Spectrum Disorders in Pediatric Patients with Pulmonary Valve Stenosis

Janet M Bell et al. J Pediatr. 2021 Jul.

Abstract

Objective: To investigate the prevalence of Noonan spectrum disorders in a pediatric population with pulmonary valve stenosis (PVS) and explore other characteristics of Noonan spectrum disorders associated with PVS.

Study design: A retrospective medical record review was completed for patients with a diagnosis of PVS seen at the Children's Hospital Colorado Cardiology clinic between 2009 and 2019. Syndromic diagnoses, genotypes, cardiac characteristics, and extracardiac characteristics associated with Noonan spectrum disorders were recorded; statistical analysis was conducted using R.

Results: Syndromic diagnoses were made in 16% of 686 pediatric patients with PVS, with Noonan spectrum disorders accounting for 9% of the total diagnoses. Individuals with Noonan spectrum disorders were significantly more likely to have an atrial septal defect and/or hypertrophic cardiomyopathy than the non-Noonan spectrum disorder individuals. Supravalvar pulmonary stenosis was also correlated significantly with Noonan spectrum disorders. Extracardiac clinical features presenting with PVS that were significantly associated with Noonan spectrum disorders included feeding issues, failure to thrive, developmental delay, short stature, and ocular findings. The strongest predictors of a Noonan spectrum disorder diagnosis were cryptorchidism (70%), pectus abnormalities (66%), and ocular findings (48%). The presence of a second characteristic further increased this likelihood, with the highest probability occurring with cryptorchidism combined with ocular findings (92%).

Conclusions: The 9% prevalence of Noonan spectrum disorder in patients with PVS should alert clinicians to consider Noonan spectrum disorders when encountering a pediatric patient with PVS. The presence of PVS with 1 or more Noonan spectrum disorder-related features should prompt a genetic evaluation and genetic testing for RAS pathway defects. Noonan spectrum disorders should also be included in the differential when a patient presents with supravalvar pulmonary stenosis.

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