資源描述：
《diseases of the heart課件》由會員上傳分享，免費在線閱讀，更多相關內容在教育資源-天天文庫。
1、DiseasesoftheHeartMajorDeterminantsofDiseaseMostheartdiseaseistheresultofatheroscleroticobstructionofthecoronaryarteriesCongestiveheartfailureismechanicalfailureofthehearttoejectblooddeliveredtoitMetabolicorautoimmunediseasemaycauseheartmuscleorvalvedamageHighbloodpressureac
2、celeratesatherosclerosis&mostothercardiacdiseaseCardiacvalvesareone-waygatesforbloodflow&aresusceptibletoobstruction®urgitationCardiacvalvesaresusceptibletoinfectionAbnormalembryonicdevelopmentoftheheartproducessignificantcardiacanatomicmalformationsAbnormalheartbeatpatte
3、rns(arrhythmias)cancausecardiacdysfunctionordeath&cancomplicateanyheartconditionArrhythmiasMechanicallyinefficientCOdecreasesPotentiallyfatalCausedbymyocardialischemiaMIelectrolyteimbalancestresscaffeinedrugs,especiallystimulantscongenitaldefectsintheelectricalnetworkNormalr
4、hythmis~70beats/minbradycardiais<60beats/mintachycardiais>100beats/minPrematureatrialcontractionsextraatrialbeatscommoninhealthypeoplenotharmfulduetostresslackofsleepcaffeinesomedrugsAtrialflutterrapid,regularatrialrhythm~300beats/minAtrialfibrillationrapid,irregularatrialrh
5、ythmAVnodefiltersoutalotdecreasedCOEachyearheartdiseaseaccountsforabout1/3ofdeathsintheUS,mostofwhichareassociatedwithcoronaryarteryatherosclerosis.Ifcerebrovasculardisease,vascularcomplicationsofdiabetes,&othervasculardiseasesareincluded,thefigureisover40%.Afterage40thelife
6、timeriskfordevelopingsymptomaticcoronaryarterydiseaseis50%inmen&40%inwomen.HeartBlockAtrialsignalisdelayed&cannotcrossintotheventricleCommoncauseisanatomicabnormalitiesCanalsobecausedbydigitalis1stdegreedelayofsignalbutnomissedventricularbeats2nddegreedelaylongenoughtocausem
7、issedventricularbeats3rddegreetotalblockofatrialsignaldecreasedCOPrematureventricularcontractionsoccurinhealthypeoplechestpalpitations&anxietyVentriculartachycardiaspontaneous,regularbeatingat>120beats/mindecreasedCOVentricularfibrillationextremelyrapid&irregularnegligibleCO
8、CongestiveHeartFailureCHFHeartunabletoejectvolumeofblooddeliveredtoitEndpoi
