diseases of the heart课件

《diseases of the heart课件》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

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