scuola h di ygiene course medicina - benvenuto · 2020. 1. 10. · dpcm 29 novembre 2001. s l of e...
TRANSCRIPT
![Page 1: Scuola H di YGIENE COURSE Medicina - Benvenuto · 2020. 1. 10. · DPCM 29 novembre 2001. S L OF E H E E Recall to next ... Gruppo Italiano Screening (Gisci, Gisma, Giscor) Pubblicazione](https://reader033.vdocument.in/reader033/viewer/2022051901/5ff0921f36280b0db04c30ae/html5/thumbnails/1.jpg)
HYGIENE COURSE
Scuoladi
Medicina
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSEScreeningtest
• Systematic exam,conducted withclinical,instrumental tecnique orlaboratory testdesigned todetect cases ofdisease inpre-clinical stageinapopulation
• Secondary prevention• Means:early detection• Goal:reducing mortality byreducingincurable forms
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSETwobytwotable
D+ D-
Positive
Negative
80 40
20 60
TP + FN FP + TN
TP + FP
FN + TN
N
Disease
Screeningtestresults
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSETwobytwotable
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
![Page 5: Scuola H di YGIENE COURSE Medicina - Benvenuto · 2020. 1. 10. · DPCM 29 novembre 2001. S L OF E H E E Recall to next ... Gruppo Italiano Screening (Gisci, Gisma, Giscor) Pubblicazione](https://reader033.vdocument.in/reader033/viewer/2022051901/5ff0921f36280b0db04c30ae/html5/thumbnails/5.jpg)
SCHOOLOFMED
ICIN
E
HYG
IENECO
URSETwobytwotable
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
P P
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSETwobytwotable
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
P P
N N
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSETwobytwotable
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
TP P
N N
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSETwobytwotable
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
TP FP
FN TN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Screeningtestformularule
“Trues”ontopanddividebyeverything
• Sensitivity,Specificity,Positivepredictivevalue,Negativepredictivevalueandaccuracy
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Sensitivity
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
TP FP
FN TN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Sensitivity
Negative Positive
Healthy people
Disease
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Screeningtest:reality
Negative Positive
Healthy people
Disease
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Sensitivity
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
TP FP
FN TN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Screeningtestparameters
• Sensitivity:identifyingcasesofdiseaseFormula=TP/(TP+FN)Sens:80/(80+20)=80%
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Specificity
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
TP FP
FN TN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Screeningtestparameters
• Sensitivity:identifyingcasesofdiseaseFormula=TP/(TP+FN)Sens:80/(80+20)=80%
• Specificity:identifyingdisease–freepeople,healthypeople
Formula=TN/(TN+FP)Spec:60/(60+40)=60%
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Theideal test
healthy
diseased
cut-off
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSEThereal test...
cut-off
TP
TN
FPFN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
PositivePredictiveValue
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
TP FP
FN TN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
PositivePredictiveValue
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
TP FP
FN TN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Screeningtestparameters
• Positivepredictivevalue:likelihoodthatapositivetestresultindicatesrealdisease
Formula=TP/(TP+FP)PPV:80/(80+40)=66.7%
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
NegativePredictiveValue
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
TP FP
FN TN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Screeningtestparameters
• Positivepredictivevalue:likelihoodthatapositivetestresultindicatesrealdisease
Formula=TP/(TP+FP)PPV:80/(80+40)=66.7%
• Negativepredictivevalue:likelihoodthatanegativetestresultindicatesnorealdisease
Formula=TN/(TN+FN)NPV:60/(60+20)=75%
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Screeningtestparameters
• Twosetsofscreeningtestvalues1) Sensitivityandspecificity2) PPVandNPV
• Sensitivityandspecificity:pre-testprobabilities
• PPVandNPV:post-testprobabilities
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Understandingscreeningtests
Sens=80% Spec=60%
PPV:66.7% NPV:75%
Agoodtest?
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Understandingscreeningtests
Sens=80% Spec=60%
PPV:66.7% NPV:75%
Agoodtest?Onlyso-so
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Accuracyorefficiencyofthetest
D+ D-
Positive
Negative
80 40
20 60
TP + FN100
FP + TN100
TP + FP120
FN + TN80
N = 200
Disease
Screeningtestresults
TP FP
FN TN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Accuracyorefficiencyofthetest
• PercentagecorrectOVERALL• Formula:TP+TN/(TP+TN+FP+FN)
TP+TN/N,samplesize• Acc:80+60/200=70%
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSEIncreasing specificity
cut-off
VP
VN
FPFN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSEIncreasing sensitivity
valore di cut-off
VP
VN
FPFN
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSENecessary conditions
forthefeasibility ofscreeningprograms
1. Disease toscreenis animportant publichealthissue
2. Epidemiologyandnatural history should bewell known
3. Exists anindicatorofthedisease inpre-symptomaticphase
4. History ofthedisease canbemodifiedwithearly detection
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Necessary conditionsforthefeasibility ofscreening
5. Effective screeningtest:§ simple,harmless,reliable,validated§ reproducible andaccurate§ consensus onthedefinition ofpositivetest§ agreement onthediagnostic study protocol andtheoptions available forthepositivetestsubjects'
6. Effective treatmentforthescreeneddisease
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
3. Exists anindicatorofthedisease inpre-symptomaticphase
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
3. Exists anindicatorofthedisease inpre-symptomaticphase
Leadtime=interval oftimebetween themomentinwhich thediagnosis is performed forthescreeningeffect andthetimewhen thediagnosis would have been madefortheappearance ofclinical signs ofdisease
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Goalofancancer screeningprogramme
• Reducemortality fromcancer byreducing theincidence ofincurableforms
• It’s secondary prevention (keep it inmind always !!!)
GrazziniG.,etal.MinisterodellaSalute.Roma,2006.
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Organized screeningprograms vs.spontaneous screening
• Freeandactiveoffer(personalinvitation)tothepopulationat-risk
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Organized cancer screeningprograms
• Publichealth interventions includedintheLEA
• Possibility toanticipateacancer diagnosisshouldbeuniversally guaranteed
DPCM29novembre2001
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Recall tonextscreeninground
Invitation to2°level=
Diagnostic level
Invitation fromthescreeningcentre
1° level test=ScreeningTest
3° levele =terapeuticIntervention (surgery and/or
chemiotherapy)
+
Pathway
+
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SCHOOLOFMED
ICIN
E
HYG
IENECO
URSE
Screeningtestis NOTdiagnostic
Testdiscreening
NEGATIVO
Nessunaltroesame
Verinegativi Falsinegativi
NONNEGATIVO
Esamediapprofondimento
Veripositivi Falsipositivi
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• Breast Cancer• Cervical Cancer• Colorectal (Colon)Cancer
Cancer screening
www.ccm-network.itwww.epicentro.iss.it
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URSENecessary conditions
forthefeasibility ofscreeningprograms
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Incidence andMortality worldwide:women
Ferlayetal,GLOBOCAN2008:CancerIncidenceandMortalityWorldwide,IARC2010
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Incidence andMortality worldwide:men
Ferlayetal,GLOBOCAN2008:CancerIncidenceandMortalityWorldwide,IARC2010
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Breast Cancer Screening• Womenaged 50– 69years• Screeningtest:Mammography (bilateral inadoubleprojection)
• Every 2years
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IIlevel
� Clinical breast exam,mammography� Fineneedle aspiration� Corebiopsy
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IIIlevel
� Surgical treatment:§ Quadrantectomy
§ Mastectomy
� and/orchemioteraphy
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Benefits
Mortality reduction:38%
Womennotincluded
inascreeningprogram
Screenedwomen
Euroscreen working group.Lancet2013
vs
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Benefits
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Risks
• Overdiagnosis• Psycological harm(anxietyinadvanceofthetest,distressifabnormalitiesaredetected)
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Breast cancer incidenceItaly,2006- 2009
AIRTUM – AIOM. I numeri del cancro 2013.
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Cervical cancer screening
�Women25– 64years� Screening(Ilevel):Pap smear
� Every 3years� BethesdaClassification,2001
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BethesdaClassification 2001
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IIlevel
Different according toPap smear results:
� HPVtest(all positivetests)� Repeat Pap smear (ASC– US,LSIL,inadeguati)� Colposcopywithorwothout endometrial biopsy(HSIL,ASC– H,AGC,Cr)
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IIIlevel
• TreatmentforCIN2andCIN3:– laservaporization– cryotherapy– radicaldiathermy– conization– ….
• 6months follow upforCIN1
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URSENewguidelines
• Pap testevery 3years:women 24to30years
• HPVtestevery 5years:Women>30years
Ronco G.etal.,TheLancet,February2014
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Colorectal cancer screening
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Colorectal cancer screening
� Menandwomen between 50and70years
� Screeningtest(LevelI):Fecal OccultBloodTest
� Every 2years
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Colorectal cancer screening
• SomeItalian programs (Piedmont andVeneto)usethesigmoidoscopy as ascreeningtest(level I)
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IIlevel
• Colonoscopy• Biopsy• If colonoscopy is not executable orisrejected:Rx colonwithdoublecontrast orTACcolonography
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IIIlevel
• Surgery
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Familiarity forbowel cancer
• managementis not thesame inItaly• Each program implements differentprotocols
• InPuglia:– First-degree relatives ofpatientswithcancer:colonoscopy
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Monitoring ofscreeningprograms
• It’s necessary totrack every action:fromtheidentification ofthetargetpopulationtothepossible treatment
• Dataallow us tocomparetheperformanceoftheprogram withindicators contained intheguidelines
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Performanceindicators
• Thesame forall ofItalian screeningprograms
• Published annually onthewebsitewww.osservatorionazionalescreening.it
• Foreach screeningprogram andeachscreeningis needed tofill outapre-formedsheet:– GISMAform– GISCIform– GISCORform
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URSEInformativeflow
Responsabiledelprogrammadi
screeningterritorialecompilaeinviala
SCHEDARaccoltadelle schede
edelaborazioneGruppoItaliano
Screening(Gisci,Gisma,Giscor) Pubblicazionesulsitoe
presentazioneinoccasionedel
congressoannualeEntroil30settembredell’anno
successivoaquelloinesame
MinisterodellaSaluteTraGennaioe
Febbraiodell’annosuccessivoallaraccoltadeidati
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Toimprove you knowledge…
• http://www.cdc.gov/cancer/dcpc/prevention/screening.htm
• http://www.cancer.org/healthy/findcancerearly/cancerscreeningguidelines/