1.1 Current evidence on the safety and efficacy of percutaneous balloon valvuloplasty for fetal critical aortic stenosis is limited in quantity and the results are inconsistent. Therefore, this procedure should only be used in the context of research.
1.2 NICE encourages the peer-reviewed publication of all further research. Further research could be in the form of controlled trials, analysis of registry data or other observational studies. It should address patient selection, timing of the intervention and the natural history of the disease.