USCOM相关参数定义

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1、USCOM᮴߯㸔⌕ࡼ࡯ᄺⲥ⌟ҾⳈ᥹⌟䞣˖HRVpkPmnVtiMDFTFTCET%݀ᓣ䅵ㅫ˖SVSVISVVCOCISVRSVRIDO2DO2ISWCPOSMIIPKRHRHeartRateᖗ⥛˖↣ߚ䩳ⱘᖗ᧣⃵᭄˄bmp˅SVXHR=COHRisthenumberofcardiaccyclesinbeatsperminuteVpkPeakVelocityofFlowዄؐ䗳ᑺ˖᠔⌟⌕䞣⊶ᔶⱘ᳔໻䗳ᑺˈेߎᖗᅸ㸔⌕ⱘ᳔໻䗳ᑺ˄m/s˅Vpkisthepeakvelocityofthemeasuredflowprofileinmetrespersecond简单来说能代表心肌

2、的收缩能力，但是受到前负荷及后负荷的影响。PmnMeanPressureGradientᑇഛय़࡯ẃᑺ˖ᰃᣛᖗ㛣ᬊ㓽ᳳⱘᑇഛय़࡯Ꮒ˄mmHg˅PmnisthemeanpressuredifferenceacrossthevalveduringsystoleinmillimetresofmercuryVtiVelocityTimeIntegral䗳ᑺᯊ䯈⿃ߚ(cm)Ѻ⿄Ўᖗम䎱⾏ˈᰃᣛऩডᇘԧ↣Ͼ਼ᳳ᠔䍄ⱘ䎱⾏ˈҹ६㉇(cm)䅵ˈ㹿ᅮНЎ⌕䞣ऎඳVtiisthedistanceincentimetres(cm)asinglereflectortravelspercycle

3、,andisdefinedastheareaoftheflowMDMinuteDistanceߚ䩳䎱⾏˖ᣛ㸔㒚㚲↣ߚ䩳⿏ࡼⱘ㉇᭄m/minMDisthedistanceabloodcelltravelsinmetresperminute(m/min).Thisisameasureofcardiacoutputwhichisindependentofcrosssectionalarea代表整个循环系统的速度，升高时主要影响因素常见为发热、感染等循环加速情况FTFlowTime⌕ࡼᯊ䯈˖ᖗ㛣ᬊ㓽ᳳᇘ㸔᠔⫼ᯊ䯈˄ms˅FTisthesystolicejectiontimeF

4、TCFlowTimeCorrected᷵ℷ⌕ࡼᯊ䯈˖Փ⫼Bazett݀ᓣ䅵ㅫⱘℷ⌕ࡼᯊ䯈˄ms˅FlowTimecorrectedcalculatedusingBazett’sformula(ms)在心肌收缩力指数基本正常的情况下能反映患者目前前负荷情况FTC低代表前负荷不足，高了反之。ET%EjectionTimePercentageᇘ㸔ᯊ䯈ⱒߚ↨˖ᖗ㛣ᬊ㓽ᇘ㸔᠔ऴᖗࡼ਼ᳳᯊ䯈ⱘⱒߚ↨⥛Normalisedejectiontime(ET%)isthepercentageofcycledurationoccupiedbysystolicejection(AVvalve

5、openingtoclosure,dividedbyAVvalveopeningtoAVvalveopening,x100)SVStrokeVolume↣᧣ᖗ䕧ߎ䞣˖ᣛᖗ㛣᧣ࡼϔ⃵᠔ᥦߎⱘゟᮍ६㉇㸔⎆䞣˄ml˅SVisthevolumeofbloodejectedfromtheheartduringonesystolicstrokeincubiccentimeters.Theannulardiameter(2r)ofthevalveisderivedfromaheightreferencedalgorithm,ordirectlyenteredbytheoperato

6、rfrom2Dechomeasurements.SVIStrokeVolumeIndex↣᧣ᖗ䕧ߎ䞣ᣛ᭄˄ml/m2˅˄BSA---ԧ㸼䴶⿃˅SVIistheStrokeVolumedividedbytheBSASVVStrokeVolumeVariability↣᧣ᖗ䕧ߎ䞣বᓖᑺᣛϔ㒘ᖗ䏇ЁSVব࣪ⱘⱒߚ᭄StrokeVolumeVariability%changeinSVbetweenagroupofbeatsCOCardiacOutput↣ߚᖗ䕧ߎ䞣˖ᣛᖗ㛣↣ߚ䩳᠔ᥦߎⱘ㸔⎆䞣CO=SVxHR(l/min)COisthevolumeofbloodejectedf

7、romtheheartinlitresperminute2CICardiacIndexᖗ㛣ᣛ᭄CI=CO/BSA˄l/min/m˅CardiacIndexisthecardiacoutputdividedbybodysurfacearea(BSA)inlitresperminutepersquaremetreSVRSystemicVascularResistance໪਼㸔ㅵ䰏࡯˖Џ㽕ᣛᇣࡼ㛝੠ᖂࡼ㛝ᇍ㸔⌕ⱘ䰏࡯ˈ԰Ў㸵䞣-5Ꮊᖗᅸৢ䋳㥋ⱘᅶ㾖ᣛᷛSVR=80x˄MAP–CVP˅/CO˄dyne.sec.cm˅SVRisthepressureagain