Butylene GlycolsArrhythmias, CardiacSyndromeDown SyndromeMetabolic Syndrome XNephrotic SyndromeSjogren's SyndromeTurner SyndromeAbnormalities, MultipleMyelodysplastic SyndromesCushing SyndromeAcute Coronary SyndromePolycystic Ovary SyndromeWilliams SyndromeLown-Ganong-Levine SyndromeEncyclopedias as TopicWolff-Parkinson-White SyndromeBundle of HisTachycardia, ParoxysmalElectrocardiographyHeart Conduction System