meq session 011016 case 1 - nigel fong
TRANSCRIPT
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M5MEQs201601/10/2016Case3:MsHuiBoGaohttp://tinyurl.com/jst7stf
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WelcometotheamazingworldofhematologyJ
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Ms Hui isa30yearsoldfemale.Shehasnopastmedicalhistory.ShewasreferredfromherGPwiththepresentationof4dayshistoryoffeverandarash.Shehasnootherbleedingmanifestations.Onexamination,hervitalswasT38.5BP100/62,HR80RR22SpO299%onRA.Shelookscomfortable.Examinationwasrevealingofarashoverthelimbsandtrunkwhichisnon-blanchable.
Question1.1:MsHuiBoGao
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Q1.Whicharethe2mostimportanttestwillyouorderfirst?• Fullbloodcount• LiverPanel• RenalPanel• HIVTest• DengueSerology• PT/APTT• BloodCultures
1.1Question:MsHuiBoGao
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Aclassicimageofpurpura
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Q1.Whicharethe2mostimportanttestwillyouorderfirst?• Fullbloodcount– lookingforthrombocytopenia• LiverPanel• RenalPanel• HIVTest• DengueSerology– denguerashusuallyappearswhenthefeverlyses;thispt isstillfebrilewitharash
• PT/APTT– lookingforcoagulopathy• BloodCultures
Therestarenotwrongbutyouarebeingaskedtoprioritise!
1.1Question:MsHuiBoGao
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Smalllesions(<0.5cm)• Macule– flat,cirumscribed, colored, nonpalpable• Papule– raised,solid andpalpable• Vesicle– raised, palpable,clearfluid-filled• Pustule– raised,palpable,pus filled(leukocytes orkeratin)Largelesions(>0.5cm)• Patch– largemacule(flatnon-palpable coloredarea)• Plaque– superficially raised,circumscribedsolid area• Nodule – distinctlargepapule• Bulla- largevesicle(blisters ifepidermallayercompletely sloughedoff)• Wheal– firmandedematous plaque(edemaofthedermis)Other• Plaque/scaley papule• Eschar• Erosion/ulcer• Purpura/petechia• Plaque/smooth papule
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• Purpura isusedtodescriberedpurplelesionsthatresultfromtheextravasationofbloodintotheskinormucousmembranes
• Non-blanchable
• Purpuramaybepalpableornon-palpable(flat/macular)• Macularpurpura isdividedon2morphologiescharacterizedbysizeandtypicallynon-inflammatory– Petechiae – <3mm– Ecchymosis- >5mm
• Palpablepurpura:usuallyasignofvascularinflammation
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EDbloodsshowsthefollowing:Hb 6.9TW50.2Plt 30N.myelocytes PresentPromyelocytes 90%Renalpanel:U7Na131K3.5Bicarb 20Cr60LiverPanelTBil 4ALP120AST55ALT42PT42APTT82
Youreviewthepatientintheward,vitalsT38.9BP94/70HR80.Sheisstillcomfortableanddoesnothaveanybleedingmanifestations.
Question1.2:MsHuiBoGao
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EDbloodsshowsthefollowing:Hb 6.9TW50.2Plt 30N.myelocytes PresentPromyelocytes 90%Renalpanel:U7Na131K3.5Bicarb 20Cr60LiverPanelTBil 4ALP120AST55ALT42PT42APTT82
Youreviewthepatientintheward,vitalsT38.9BP94/70HR80.Sheisstillcomfortableanddoesnothaveanybleedingmanifestations.
TW20,maybeinfection.TW100,thinkleukaemia
Question1.2:MsHuiBoGao
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Q2.Astheon-callHO,whichofthefollowingtherapieswouldyouinitiate?(Choose3of10)*• Transfuse1pintPCT• Transfuseplatelets• Referraltothehaematologyoncall• TransfertoMedicalICAformonitoring• Arrangeforaphresis• StartIVfluids2LNSover24H• Starthydroxyurea1gTDS• RepeattheFBC• Dobloodculturesandstartempiricalantibiotics• Startdexamethasone
Question1.2:MsHuiBoGao
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Don’tknowwhatisgoingon….Alwaysgobacktobasics• Transfuse1pintPCT• Transfuseplatelets• Referraltothehaematologyoncall• TransfertoMedicalICAformonitoring• Arrangeforaphresis --- youwouldn’tstartthisyourself.Callhaem!• StartIVfluids2LNSover24H• Starthydroxyurea1gTDS --- youwouldn’tstartthisyourself.Callhaem!• RepeattheFBC• Dobloodculturesandstartempiricalantibiotics• Startdexamethasone--- bigno-noinacuteleukaemia cases!Cancause
tumorlysis.
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Nowcontextualized…• Transfuse1pintPCT• Transfuseplatelets• Referraltothehaematologyoncall• TransfertoMedicalICAformonitoring--- patientisstillwell• Arrangeforaphresis• StartIVfluids2LNSover24H• Starthydroxyurea1gTDS• RepeattheFBC--- youdon’tbelievethelabisit?• Dobloodculturesandstartempiricalantibiotics• Startdexamethasone
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Somebasicmanagementprinciples• Transfuse1pintPCT• Transfuseplatelets• Referraltothehaematologyoncall• TransfertoMedicalICAformonitoring• Arrangeforaphresis• StartIVfluids2LNSover24H--- hydrationisrarelywrong• Starthydroxyurea1gTDS• RepeattheFBC• Dobloodculturesandstartempiricalantibiotics--- probablyquitesafe• Startdexamethasone
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YoualsonoticedthattheAPTT/PTisprolonged.YourMOtellsyoutoorderotherinvestigationstoworkupthecause.Q3.Whatinvestigationwillyouordernextforthispatient(Choose2)• 50%correctionstudies• Directcoombstest• D-Dimer• Liverfunctiontest• Fibrinogen• Plateletfunctiontest• Bleedingtime
Question1.3:MsHuiBoGao
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YoualsonoticedthattheAPTT/PTisprolonged.YourMOtellsyoutoorderotherinvestigationstoworkupthecause.Q3.Whatinvestigationwillyouordernextforthispatient(Choose2)• 50%correctionstudies• Directcoombstest• D-Dimer• Liverfunctiontest• Fibrinogen• Plateletfunctiontest• Bleedingtime
Question1.3:MsHuiBoGao
Thisquestion isaskingyou,whatdoyouthinkisthecauseofprolongedaPTT/PT?Theinvestigationyouchooseistoconfirmyoursuspicion.
Inthiscasecoagulopathy isduetoDIVC(happens inacuteleukaemia orvsickpt)…notduetoliverdiseaseorfactorinhibitors orautoimmune dx.
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InvestigationsinDIC:• Prolongedoftheprothrombin time(PT)
– Reflectsreducedactivityofthecomponentsoftheextrinsic andcommonpathways
– IncludefactorsVII,X,V,andprothrombin,whicharethemostfrequentlydecreasedclottingproteinsinDIC
• ProlongedActivatedpartialthromboplastin time(aPTT)– Measurestheintrinsicandcommonpathwaysofcoagulation– IssensitivetodeficienciesoffactorsXII,XI,IXandVIII– LesssensitivethanthePTtodeficienciesofcomponentsofthecommonpathway
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InvestigationsinDIC:• Thrombocytopenia:Consumptive• Plasmafibrinogen:Usuallylow inacutedecompensatedDIC– Cavet:Maybeelevatedasanacutephasereactant
• D-Dimer:high - indicativeoffibrinolysis• PeripheralBloodFilm
– Thrombocytopenia– Largeplatelets– Fragmentedredcells(schistocytes).
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Thehaematology reviewsthebloodfilmtoconfirmthediagnosis.
Question1.4:MsHuiBoGao
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Q4.Whatisthemostlikelydiagnosis?*• Acutemyeloidleukemia• Burkitts Lymphoma• Acutepromyelocytic leukemia• Acutelymphoblasticleukemia• Chronicmyeloidleukemia
Question1.4:MsHuiBoGao
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Q4.Whatisthemostlikelydiagnosis?*• Acutemyeloidleukemia• Burkitts Lymphoma• Acutepromyelocytic leukemia• Acutelymphoblasticleukemia• Chronicmyeloidleukemia
Question1.4:MsHuiBoGao
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Theanswerwasalreadyinthestem!Promyelocytes:VerygranularWeirdlooking bignucleiAuerrods
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Thediagnosisofacutepromyelocytic leukemiawasmade.Thehaematology registrarsproceedstoordertheappropriatetreatment.Q5.Whattreatmentwasordered?(Choose1)*• Alltransretinoicacid• Dexamethasone4gTDS• Hyper-CVAD• IA3+7• Allogenictransplant
Question1.5:MsHuiBoGao
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Thediagnosisofacutepromyelocytic leukemiawasmade.Thehaematology registrarsproceedstoordertheappropriatetreatment.Q5.Whattreatmentwasordered?(Choose1)*• Alltransretinoicacid• Dexamethasone4gTDS• Hyper-CVAD• IA3+7• Allogenictransplant
Question1.5:MsHuiBoGao
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ManagementofAPML• Medicalemergency:duetotheriskofalifethreateningbleed• Treatmentisstartedonclinicalsuspicion• ATRA(Alltrans-retinotic acid)akavitaminA• Supportivemanagementforbleedingcomplications
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ThenextdayyouwerecalledtoseeMs Tanforhemoptysis.Thenursesinformedyouthatshehadcoughedoutblood6timesinthelast1hour,eachtimefillingupaspecimenblood(50ml).Onreviewofthepatient,Ms Tanwastalkinginfullsentences.Shedoesnotcomplainofanybreathlessnessorchestpain.Onexamination,RR24SpO297%onRA.Heartsoundsareheardwithnoadditionmurmursorheartsounds.Lungshavereducedairentryatthebases,noadditionalsoundswereheard.
Question1.6:MsHuiBoGao
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Q6.Whatwillyoudonextinthemanagementofthispatient?• Putpatientonintranasaloxygen• Considerelectiveintubation• Patientisclinicallystable,askthenursetoinformyouiffurtherepisodesoccur
• Arrangeforrespiratoryreviewandbronchoscopy• UrgentthoraximagingwithaCTthorax
Question1.6:MsHuiBoGao
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Q6.Whatwillyoudonextinthemanagementofthispatient?• Putpatientonintranasaloxygen• Considerelectiveintubation• Patientisclinicallystable,askthenursetoinformyouiffurtherepisodesoccur
• Arrangeforrespiratoryreviewandbronchoscopy• UrgentthoraximagingwithaCTthorax
Question1.6:MsHuiBoGao
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Massivehemoptysis• Nocleardefinition:500mlover24Hor150mlover1h• Thinkoftheanatomicaldeadspace- thevolumethatislifethreateningbyvirtueofairwayobstruction(anatomicaldeadspaceisonly100-200mL)
• Medicalemergencyandshouldbeaddressedimmediately.• Initialprioritiesarestabilisationofthepatientandprotectionofthenon-bleedinglung
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• ABCfirst– maintainairwaypatency:Asphyxiationisthemostfrequentcomplicationofmassivehemoptysis
• Assessment:History,PhysicalExamination,investigationsInvestigation:FBC/PT/APTT/CXR
• InitialManagement:– Oxygenation– Lateralposition(ifsiteofbleedisknown- affectedlungindependentposition)
– IVaccess– Correctcontributingcoagulopathy/thrombocytopenia
• Localizethesourceofthebleeding:Bronchoscpoy
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PatientwaselectivelyintubatedandtransferredtoICU.Abronchoscopywasdonewhichshoweddiffusebleeding.Shewassupportedwithbloodproductsincludingplatelets,freshfrozenplasmaandcryoprecipitate.ThebleedingfinallystopsandtheICUteamconsidersextubation.
Question1.7:MsHuiBoGao
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Q7.WhichofthefollowingregardingbloodtransfusionsisINCORRECT• ThetypicaleffectivedoseofFFPis10to15mL/kg• FFPiseffectiveattreatingmildcoagulopathiescharacterizedbyINRoflessthan1.85
• CryoprecipitatecontainsfactorVIII,vonWillebrand factor,factorXIII,fibronectin,andfibrinogen
• Theriskforbacterialinfectionandsepsisisincreasedinpatientsreceivingplatelettransfusionscomparedwithotherbloodproducts
• FFPisanacellular product
Question1.7:MsHuiBoGao
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Q7.WhichofthefollowingregardingbloodtransfusionsisINCORRECT• ThetypicaleffectivedoseofFFPis10to15mL/kg• FFPiseffectiveattreatingmildcoagulopathiescharacterizedbyINRoflessthan1.85
• CryoprecipitatecontainsfactorVIII,vonWillebrand factor,factorXIII,fibronectin,andfibrinogen
• Theriskforbacterialinfectionandsepsisisincreasedinpatientsreceivingplatelettransfusionscomparedwithotherbloodproducts
• FFPisanacellular product
Question1.7:MsHuiBoGao
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Whatcanyoutransfuse• Cellularproducts:RBC,platelets• Plasmaproducts:FFP,Cyroprecipitate,plasmaderivedproducts
Approach• Knowyourindicationfortransfusion• Weightheriskandbenefits
Remember:Bloodproductsisamedicationandisapublicresource(donated)
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Redbloodcells• Indication:improvetheoxygen-carryingcapacityofblood.• Humansdisplaymanycompensatoryresponsestomaintainoxygendelivery,andnosinglehemoglobintriggerexists
• Generalguidelines:Hb >7(Adjustbaseonpatient’sphysiologicalstate)
• Targets:Typically250to300mLwithanexpectedincreaseinthehemoglobinof1g/dL (10g/L)inanonbleedingadult.
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Platelets• Indication:prophylacticandtherapeuticforhemorrhageinpatientswiththrombocytopenia
• Optionsavailable:pooledorsingledonor1unitfromasingledonor=approx 4-5pooleddonors
• Targets:usuallyunittransfusionshouldbringupplateletcountbyatleast20-30k
• Note:Storedatroomtemperature– thewarmerstorageconditionsallowforproliferationofanycontaminatingbacteria
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FreshFrozenPlasma• Indication:Prophylacticortherapeuticinpatientswithmajorcoagulopathy,warfarinreversal,massivetransfusion
• Containsallthebloodclottingfactors• Targets:FFPvolume200-300ml;effectivedosing10-15ml/kg• Note:CorrectionwithFFPisnotalinearphenomenonIUnlikePCT– 1packPCTincreasesHb ~1gTheamountofFFPrequiredtobringINRfrom10to9ismuchlessthanthatrequiredtobringINRfrom3to2.
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•Haematologyisfun•Haematologyisnotscary!!•Haematologyiseasy!!!
Conclusions