Hypoplastic Left Heart Syndrome, also known as hlhs, is related to aortic valve disease 1 and jacobsen syndrome. An important gene associated with Hypoplastic Left Heart Syndrome is TBX20 (T-Box Transcription Factor 20), and among its related pathways/superpathways are Cardiac conduction and Human Embryonic Stem Cell Pluripotency. The drugs Ambrisentan and Bosentan have been mentioned in the context of this disorder. Affiliated tissues include heart and skin, and related phenotypes are hypoplastic left heart and hypoplastic aortic arch