智慧人生

人生随缘 看不惯别人是自寻烦恼 .可以不拥有任何东西，除了对生活的激情。好好生活,你的生命是一次性的。
个人资料

给我悄悄话
更换头像
  • 博客访问：
博文
36
(2005-04-20 16:00:59)

BloodFlowAcrossIntracardiacShunts:AtrialSeptalDefects
Atrialseptaldefect(ASD)flowjetsvisualizeinthesubcostalandtherightparasternalviews,andsometimesfromtheapicalfour-chamberview.ASDsareusuallyassociatedwithlowvelocitybloodflowthatiscontinuousthroughoutthecardiaccycle,butismostprominentduringlatesystoleandearlydiastole.BloodflowthroughanASDtypicallymovesfromlefttoright,butcanmovefromrighttoleft...[阅读全文]
阅读 () ┆ 评论 (1)
35
(2005-04-20 16:00:21)

BloodFlowPatternsintheHeart:BloodFlowAcrossIntracardiacShunts
Bloodflowthroughashuntissmallanddifficulttodetect.Inaddition,theshuntsiteitselfmaynotbevisibleintheimage,ormultipleshuntsitesmaybepresent.Thedirectionandvelocitiesofbloodflow,thetiming,andthedegreeofturbulencevarysignificantlyamongshuntsites.Colorreversalproducedbyfrequencyaliasingmaymakeitimpossibletodetermineshuntflowdirectionbyre...[阅读全文]
阅读 () ┆ 评论 (0)
34
(2005-04-20 15:59:09)

BloodFlowAcrossStenoticSites:TricuspidStenosis
Youcanseeatricuspidstenosis(TS)flowjetfromtheparasternalRVinflow,theapical,andthesubcostalviews.ATSflowjetappearsindiastole,asbloodmovesthroughthetricuspidvalveintotheRV.TSflowjetsexhibitthesamecharacteristicsasdomildtomoderateMSflowjets.TSoccurslessfrequentlythanMS.BloodFlowAcrossStenoticSites:PulmonicStenosis
Tovisualizethepulmonicstenosis(P...[阅读全文]
阅读 () ┆ 评论 (0)
33
(2005-04-20 15:57:41)

BloodFlowAcrossStenoticSites:AorticStenosis
Althoughdifficulttodetect,youcansometimesseeaorticstenosis(AS)flowjetsfromtheparasternal,apical,andsuprasternalviews.TheASflowjetoccursinsystole,asbloodmovesthroughtheaorticvalveintotheaorta.TheabnormallyhighvelocityASbloodflowjetsoftenexhibitaliasingandcontainhighdegreesofturbulence.TheASflowjetisdifficulttovisualizefromanyviewbecauseoftheeccentrici...[阅读全文]
阅读 () ┆ 评论 (1)
32
(2005-04-20 15:57:07)

BloodFlowPatternsintheHeart:BloodFlowAcrossStenoticSites
Bloodflowacrossstenoticsitesisoftenhighvelocity,andgenerallyaliases.Asthevelocityincreases,thelikelihoodofturbulencealsoincreases.Tovisualizebloodflowacrossastenoticsite,useanyviewthatshowsboththeobstructionandthechamberdistaltoit.Toestimatetheseverityofastenoticlesioncalculatethepressuregradientacrosstheobstruction.CFIidentifiesbloodflo...[阅读全文]
阅读 () ┆ 评论 (0)
31
(2005-04-20 15:56:15)

RegurgitantBloodFlow:PulmonicInsufficiency
Youcanbestseepulmonicinsufficiency(PI)fromtheparasternalshort-axis,theparasternalRVoutflow,andthesubcostalviews.PIappearsindiastole,asbloodflowenteringtheRVOTfromthepulmonicvalve.
Thisparasternalshort-axisviewshowsatrivialjetofPIintheRVOTindiastole.Anenhancedvelocitymapisused.Redandorangeindicatelaminarbloodflowmovingtowardthetransducer.
Alarg...[阅读全文]
阅读 () ┆ 评论 (1)
30
(2005-04-20 15:55:21)

RegurgitantBloodFlow:TricuspidRegurgitation
TheparasternalRVinflow,theparasternalshort-axis,theapicalfour-chamber,andthesubcostalviewsarehelpfulindetectingtricuspidregurgitation(TR).TRappearsinsystole,asbloodflowenteringtheRAthroughtheclosedTV.
Thisparasternalshort-axisviewshowstricuspidregurgitationintheRAinsystole.TheTRjetisturbulent,asindicatedbythemosaicofblue,white,andorange.Theredadj...[阅读全文]
阅读 () ┆ 评论 (2)
29
(2005-04-20 15:54:35)

RegurgitantBloodFlow:AorticInsufficiency
Aorticinsufficiency(AI)isvisiblefromtheapicalparasternalviews.AIappearsindiastole,asbloodflowmovesfromtheaortatotheLVOT.
Thisparasternallong-axisviewshowsaorticinsufficiencyintheLVOTindiastoleusinganenhancedvelocitymap.TheAIjetisprimarilycoloredbluebecauseitmovesawayfromthetransducer.Themosaicofblueandyellowindicatesturbulentbloodflow.
Thediasto...[阅读全文]
阅读 () ┆ 评论 (0)
28
(2005-04-20 15:53:00)

BloodFlowPatternsintheHeart:RegurgitantBloodFlow
Regurgitantbloodflowcanbe:LoworhighvelocityLaminarorturbulentYoumayormaynotseealiasinginregurgitantflowjet.Anyviewthatshowsboththevalveandthechamberproximaltoitcanhelpyoudetectregurgitation.AlthoughCFIcanhelpyoudetectvalvularregurgitation,itsaccuracyinestimatingtheseverityofregurgitationisstillanareaofdiscussion.WhilemanysourcesapplythePWDoppler...[阅读全文]
阅读 () ┆ 评论 (0)
27
(2005-04-20 15:51:47)

NormalBloodFlow:NormalBloodFlowThroughthePulmonicValve
Theparasternalshort-axis,theparasternalRVoutflow,andthesubcostalviewsshowbloodflowthroughthepulmonicvalve.NormalRVOT,insystoleandthebifurcationofthemainpulmonaryarteryimageinthisview.Anenhancedvelocitymapmakesthebloodflowmovingawayfromthetransducerprimarilyblue.Thesmoothprogressionfromlightbluetoyellowindicateshighvelocitysignalsthathaveal...[阅读全文]
阅读 () ┆ 评论 (1)
[<<]
[上一页]
[81]
[82]
[83]
[84]
[85]
[下一页]
[>>]
[首页]
[尾页]