Identifying early signals - WHO · 11/27/2009 · Physicians Desk Reference(PDR). ... Dar es...
Transcript of Identifying early signals - WHO · 11/27/2009 · Physicians Desk Reference(PDR). ... Dar es...
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David Coulter
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Summary of content
What is a signal?Recognising a signalWhat can be achieved by you?Clinical assessment of individual eventsClinical review of collated eventsPrinciples of signal detectionTa
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Definition 1
A signal refers to ‘reported information on a possible causal relationship between an adverse event and a drug, the relationship being unknown or incompletely documented previously’.
WHO
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Definition 2
In practice it means, a strong suspicion of an adverse reaction that has not been recognised previously
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Recognising a signal
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Signal identification
Record
Collate
Look!!
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Recognition of a signal 1
How do we know when events are not recognised reactions?Martindale*DrugDex*Physicians Desk Reference (PDR). All available on website of Micromedex Healthcare Series www.thomsonhc.com
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Recognition of a signal 2
You don’t need to do data mining (BCPNN), or proportional reporting ratios (PRR), or disproportionality analysis to identify signalsCareful clinical assessment of your own events data is the quickest and most satisfying way.
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Recognition of a signal 3
Routine clinical appraisal facilitates the earliest possible generation of hypotheses Automated signal detectiongood for testing hypothesesidentifying missed signalsstill needs clinical confirmation
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Recognition of a signal 4
Clinical review the quickest methodcarefulinformedsystematicstandardisedclinical reviewIn your centre
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What can be achieved –by you?
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What can be achieved?
Example: IMMP ‐omeprazoleHyponatraemiaDry mouth Taste disturbanceInterstitial nephritisPolydypsia / polyuria Polymyositis
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Omeprazole
Hepatitis Angioedema / urticariaBone marrow depression Carcinoid tumourGastric polypsDiarrhoea
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Omeprazole
HallucinationsAmnesia / confusionHeadache MyalgiaGynaecomastia / galactorrhoea
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Omeprazole
Paraesthesia Pruritus RashExtrapyramidal symptomsBlood dyscrasias
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Clinical assessment of individual events
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COX‐2 inhibitors and disturbance of vision
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Example 1
M 78Shoulder painRofecoxib 50 mg onceWoke next morning with
no vision right eye6/18 left eye
Recovered next day
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Example 1
M 81Osteoarthritis kneeCelecoxib 100mg dailyCentral loss of visionOnset after each morning dose, recovering after a few hoursNo recurrence after withdrawal
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Example 1
These 2 case reports can be called the INDEX CASESContain good information
close time relationshippositive dechallengeone had rechallenge
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Example 1
Now we look for information that may strengthen the signal:Other case reportsWHO database (Vigibase)LiteratureMechanism
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Example 1Other reports of eye problems‐blurred vision
Patient Dose Onset
Rof M 58 ? 1 week
Cel F 53 200mg 4 months
Cel F 59 200mg 1 week
Cel F71 200 ?
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Example 1WHO reports
CelecoxibBlindness 12Temporary blindness 4Vision abnormal 181
RofecoxibBlindness 22Temporary blindness 5Vision abnormal 167
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Example 1Literature search
One case report with celecoxibOrange spots in both visual fields. (Lund & Neiman, 2001)
No reports with rofecoxibVisual field defects have been reported rarely with the traditional NSAIDs
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Example 1Mechanism
Interference with retinal blood flow by inhibition of prostaglandins and related substances.
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Example 1Conclusion
Two good index casesSeveral supporting casesSupporting cases in WHO databaseSimilar reports for related drugsA plausible mechanismOnly one similar report in the literatureWe have a signal!
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Clinical review of collated events
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COX‐2 inhibitors and prothrombotic disorders
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Demo
Cluster of events
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Profile of Incidents - Celecoxib and Rofecoxib n=131 n=71
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Prothrombotic events
Summary of findingsNo difference in rates of IHD / stroke between rofecoxib & celecoxibHigher rate of prothrombotic events than comparatorsShorter time to onset of death than comparatorsDifferences in death rates due to prothrombotis eventsHigher rate of cardiac dysrythmias with celecoxib
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Principles of signal detection
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Remember
Treatment dates ‐starting date & endingDate of onset of eventWas the patient on the drug when the event began?Calculate onset timeEffect of dechallenge / rechallenge
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Signal assessment
Other questionsCould the problems be caused by a disease?
The disease being treatedA co‐morbid condition
Could the problems be caused by another drug?Are the events caused by related drugs?Is it relevant or important?
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Look for non‐random features
GenderAgeDuration to onset
Survival / life table analysis
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Non‐random features
Differences in meansPatients with reaction v patients in cohortt‐test
Differences in ratesRR with CI
Survival or life table analysisClustering around a certain durationDifferences between medicines
Multiple logistic regression
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Collate reports clinically
By Clinical Category (CC)Then in clinically related groups
Anatomical functional changeClinical sub‐group
Primary event termSecondary event term
Motto:
Sort & see & pursue27 Nov 2009Dar es Salaam 40
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Identifying early signals
Report your signals to:your advisory committee &/or regulatory authoritylocal health practitionersthe Uppsala Monitoring Centrelocal ADR bulletinmedical journal
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Signal identification
Record
Collate
Look!!
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Thank You
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