NF1 and Cardiodysrhythmic potassium-sensitive periodic paralysis: The syndromic group (n = 6) comprised one patient each of Sotos syndrome (SS), Rett syndrome (RS), Prader Willi syndrome (PWS), Neurofibromatosis 1 (NF1), Andersen Tawil syndrome (ATS) and Pterygium syndrome (PS).