Hypoplastic left heart syndrome (HLHS) is a group of defects of the heart and large blood vessels. A child is born with this condition (congenital heart defect).nutch_noindexSearchTermMenuButtonDonateContactMyChartLoginFindaDoctorSecondOpinionDonateContactReferaPatientEnEspañolOurLocationsMedicalServicesAboutUsResearch&InnovationPatients&VisitorsForHealthProfessionalsSecondOpinionDonateEnEspañolMyChartLoginRecentlyVisitedOurLocationsMedicalServicesAboutUsResearch&InnovationPatients&VisitorsForHealthProfessionalsSearchTermCANCELViewMoreResultsLoading...Informationaboutthe2019NovelCoronavirus.Readthelatest>Informaciónsobreelcoronavirus2019(COVID-19).Aprendamás>/nutch_noindex HypoplasticLeftHeartSyndrome(HLHS)inChildrenWhatishypoplasticleftheartsyndromeinchildren?Hypoplasticleftheartsyndrome(HLHS)is agroupof defectsoftheheartandlargebloodvessels.Achildisbornwiththiscondition(congenitalheartdefect).Itoccurswhenpartoftheheartdoesn'tdevelopasitshouldduringthefirst 8weeksofpregnancy.InHLHS,mostoftheleftsideoftheheartis small,underdeveloped,orboth.Thefollowingstructuresareusuallyaffected:Mitralvalve. Thisvalvecontrolsbloodflowbetweentheleftatriumandleftventricle.Leftventricle. Thisisthelowerleftchamberoftheheart.Itpumps bloodtothebody.Aorticvalve. Thisvalvecontrolsbloodflowfromtheleftventricleintotheaorta,andthentothebody.Theaortaisthemajorbloodvesselthatdeliversbloodtothebody.Aorta. Thisisthelargearteryleadingfromtheleftventricletothebody.Theleftventricleisnormallyverystrongsoitcanpumpbloodtothebody.Whenitissmallandpoorlydeveloped,itcan'tpumpanyorenoughbloodouttothebody.Forthisreason,ababywithHLHSwillnotlivelongwithoutsurgerytofixthedefect.Whatcauseshypoplasticleftheartsyndromeinachild?Achildisbornwiththiscondition(congenital).Somecongenitalheartdefectsoccurmoreoftenincertainfamilies(geneticdefects).Inmanychildren,HLHSoccursbychance.Thereisnoclearreasonforitsdevelopment.Whatarethesymptomsofhypoplasticleftheartsyndromeinachild?Babieswithhypoplasticleftheartsyndromeusuallyge