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![Page 1: Where will retinal screening go? Graham Leese Ninewells Hospital Dundee Lead Clinician for DRS in Tayside.](https://reader036.fdocuments.net/reader036/viewer/2022070412/56649eca5503460f94bd87ff/html5/thumbnails/1.jpg)
Where will retinal screening go?
Graham Leese
Ninewells Hospital Dundee
Lead Clinician for DRS in Tayside
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Exciting times
• Screening Intervals
• OCT in screening
• Anti-VEGF treatment
• Automated grading
• Reaching the unreachable
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Why do we screen annually?
Always Been so
Easy to organise
Fits in with Annual visits to Doctor
PRACTICAL REASONS
Not EVIDENCE BASED REASONS
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Retinal Photography Screening
IT call/recall systems
Chance to change Annual Routine
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Wisconsin: Incidence at 4 year from Diagnosis
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
Young Older
Prolif
Macul
Treatable
Wisconsin II, III, IV (1984)
%
N=<996 N=<1370
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“Reclaim Democracy”
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Prevalence of Proliferative Retinopathy (%)
0
5
10
15
20
25
30
35
40
0-4y 5-9y 10-14y 15-19y 20-24y 25+
Kristinsson et al 1997Diabetes Duration
Pale blue: Type-1 diabetes
Dark blue: Type-2 diabetes
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1994: National Retinal Screening Scheme
Slit Lamp every 2 years if no baseline retinopathy
10yr review in 2007 of 296 patients:
23 pre-proliferative, 4 proliferative
4 Macular oedema- all in eye clinic before treatment req’d
Olafsdottir et al BJO 2007
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Progression of Retinopathy:T2 Diabetes: Newly Diagnosed: No baseline retinopathy
0
1
2
3
4
3yr 6yr 9yr
Kohner et al UKPDS 52Diab Med 2001
UKPDS: n=2316
% needing laser
0.2%
1.1%
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Progression of RetinopathyAny Type-2 diabetes: No baseline retinopathy
0
1
2
3
4
1yr 2yr 3yr 4yr
Younis et al Lancet 2003
Liverpool Eye Study: n=9890, 20570 screening events
% with ST eye disease
0.5%*
1.4%
0.3% ST-retinopathy
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Screening Interval: Type-1 Diabetes
Incidence of ST eye disease (%) from baseline “no retinopathy”
0
1
2
3
4
5
6
7
8
9
1 2 3 4 5 6
Younis et al 2003, Diab Med
0.6%*
1.6%
N=501: 2742 screening events
0.3% ST retinopathy
2.6%
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Progression at 3 yearsType-2 Diabetes: No baseline retinopathy
0
5
10
15
20
25
30
Mild/Mod Sev/Prolif Mac Edema
Agardh et al Diab Care 2011
% progressed
N=1322
0.2%*
*Only ONE eye required laser
Nb: HbA1c = 46 mmol/mol / 6.4%
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Incidence of RetinopathyNo baseline Retinopathy: T2 diabetes
0
2
4
6
8
10
12
14
1 year 4 year
Any
Refer
Ins & 10yr subgrp
Annual Incidence per 100 patients
N=57,199 (87% follow-up)
0.2 0.35
Thomas et al BMJ 2012
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Incidence of RetinopathyNo baseline Retinopathy: T2 diabetes
Outcome at 5 YEARS
0
1
2
3
4
5
6
7
No Basal Ret Basal BR
PreProlif
Prolif
Macul
Incidence per 100 patients
N=16,444
Jones et al Diab Care 2012
0.68
Norfolk
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Progression in Type 1 diabetes from no baseline retinopathy:
DRS Scotland
0
0.5
1
1.5
2
2.5
3
1y 2y
Overall
Mac
Prolif
N=7869
%
0.50.7
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Progression in Type 2 diabetes from no baseline retinopathy:
DRS Scotland
0
0.5
1
1.5
2
2.5
3
1y 2y
Overall
Mac
Prolif
N=101,539
%
0.13 0.22
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Cost-effectiveness of retinal screening: 1 vs 3 years
AGE 45 yr 65yr
HbA1c 11%
(97mmol/mol)
7%
(53 mmol/mol)
Days of sight saved (1 vs 3yr)
21 3
Cost per QALY
(1 vs 2 yr)
£27,000 £141,000
Vijan et al JAMA 2000
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Use of Optical Coherence Tomography (OCT)
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Macular Disease
• 80% of referrals are for maculopathy
• 80%+ of these do not require treatment (at time of referral)
• At least 65% of referrals unnecessary
• Eye Clinics overloaded
• ISMO trial – looking at the use of OCT in screening
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M2 result
Retinal Screening
Eye Clinic
Retinal Screening
M2 Result
OCT screening
Eye Clinic
100%
20%
Incorporation of OCT step within screening programme
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Double Benefit
a) Fewer referrals
b) Can discharge more from Eye Clinic
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Intra-vitreal VEGF therapy
Ranibizumab (Lucentis): Licenced
Bevacizumab (Avastin): Cheap
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Diabetic Macular Oedema
• Proven benefit in clinical trials
• NICE reviewing use of Lucentis (31/10/12)- 400μm central thickness- company discount - ? For 6/18 vision
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• New Treatment option
• 5 maculopathy referrals for 1 proliferative
• More important to look for maculopathy? - more treatable
• Less important to look for maculopathy? - becomes a symptomatic condition
BACKGROUND
QUESTIONS
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AUTOMATED GRADING
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Automated Grading
EQA results
Q3 2012
Centres Autograder
Sensitivity 88.6-95.5% 95.5%
Specificity 87.0-97.8% 34.8%
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What are we trying identify?
What are we expected to identify?
Non-diabetic pathology?
Who does what?
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ANNUAL ANNUAL
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……….and its getting better all the time!
AUTOGRADING
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Sensitivity / Coverage
• Screening Intervals
• OCT in screening
• Anti-VEGF treatment
• Automated grading
• Reaching the unreachable
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Number of people with Diabetes in Tayside
0
5000
10000
15000
20000
25000
1997 2002 2007 2012
2.9%1.8% 4.0% 4.8%
Numbers doubling every 9-10 years
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0
50
100
150
200
250
300
2001 2002 2003 2004 2005 2006
Number of patients receiving laser
Number of patients with diabetes (x100)
NUMBER OF PATIENTS RECEIVING LASER IN TAYSIDE
Vallance et al Diab Care 2008
62% reduction
60% increase
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0
0.5
1
1.5
2
2.5
2001 2002 2003 2004 2005 2006
PERCENTAGE OF PATIENTS RECEIVING LASER
% of patients receiving laser
% of patients receiving incident laser
Vallance et al Diab Care 2008
2.5 fold reduction for both
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Prevalence of Blindness in Scotland due to Diabetes
0
10
20
30
40
50
60
70
80
2004 2005 2006 2008 2009 2010 2011
Scottish Diabetes Survey Figures
Rate per 10,000
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Prevalence of Blindness in Scotland due to Diabetes
0
10
20
30
40
50
60
70
80
1999 2004 2005 2006 2008 2009 2010 2011
Scottish Diabetes Survey Figures
Rate per 10,000
Fife
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Visual Outcomes
• One episode of missing eye screening:3.1x increased risk of laser
• From 1990-1995 16/17 Diabetes related blindness was due to poor attendance
• From 1990-1999 the majority of blindness due to diabetes related to poor attendance
Cormack et al BJO 2001
Rhatigan et al Eye 1999
Leese et al Diab Care 2008
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RISK FACTORS FOR NON-ATTENDANCE
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Geography & Screening Uptake
• Tayside, Scotland• Community retinal
photography from 1990
• Digital screening from 2000
• Comprehensive annual screening from ~ 2002
• 4.2% diabetes
• 2004-2006• 15,150 patients,
32,621 screening episodes
• Age 63 years• 7.3yrs of diabetes• 54% male• 12% DNA rate
Leese et al Diab Care 2008
BACKGROUND STUDY
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Clinical Risk Factors Associated with Non-attendance
• Young age
• Long diabetes duration
• High HbA1c
• High BP
• Smoker
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Geography and Non Attendance
• GIS: looking at distance and time
• Average distance to screening 3.3 miles
• Average time 11.7 min (0 - 87.2min)
• Distance or Time NOT associated with attendance
• Appointments to mobile Unit: 2.9 (2.5- 3.4) x more likely not attend eye screening than Static Unit (p<0.01).
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Deprivation as a risk of Non-Attendance
0
0.5
1
1.5
2
2.5
1 2 3 4 5
SIMD Deprivation Category
Relative Risk *
** p<0.01
Leese et al 2008
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Lothian DRS Survey 2011Interview of 20 DNAs
Unaware of Importance 5
Transport problems 4
Other health problems 4
Work 3
Previous negative experience 3
Lack of mobility 2
Caring for others 2
Bereavement 1
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Barriers to accessing Eye Care Services: RNIB 2011 Focus Group
• Limited awareness of eye health
• Symptom led demand for eye examinations
• Worry and confusion about costs (what is free and what is not?)
• Services fragmented
• Poor interaction with clinicians
Bradford, Cwm Taf, Glasgow, Hackney, West Belfast
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WHAT MIGHT HELP IMPROVE ATTENDANCE?
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Telephone Reminders
• Gastroenterology clinic. Call 1wk prior25.3% to 5.7% DNA rate
• Rheumatology clinic72% wanted reminder 1-4d before52% phone call most popular,Unless <28yr: text was most popular
• Four RCTs with 3547 participantsAdditional phone calls reduce DNAText as good as phone call
Gauthier et al J Clin Rheu 2012
Scott et al JRSocMed 2009
Car et al Cochrane Rev 2012
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Reducing DNA in General Practice
-35
-30
-25
-20
-15
-10
-5
0
5
Code Verbal Written Verbal,Written,Poster
Change inrate of DNA
Patients given code to record, made to make verbal or written reminders. Poster with frequency of attendees (not DNAs).
Martin et al JRSoc Med 2012
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Patient suggestions to improve• Evening appointments
• Link with other appointments
• Telephone reminders
• Text reminders
• Short time scales
Patient comments•Confusion with Optician role
•Busy people
•Local provision valued Lothian DRS survey 2011
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Solutions to accessing DRS in Glasgow: RNIB 2011 Focus Group• Screening liked
• Confusion about roles of Optometry/GPs/DRS/Eye Clinics
• Use local centres e.g. Community Hall
• Want general support for Diabetes Care (ie integrate care)
• Solutions should build on existing services
• Help with language barriers
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Are we looking in the right direction for solutions?......
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Summary: Who is High Risk of Non Attendance?
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Summary: What might help?
• Telephone and Text reminders
• Integrate with other diabetes appointments
• Patient to give verbal or written confirmation
• Evening appointments
• Opportunistic (IP/ OP/ Transition)
• Local Provision (Mobile unit/Community Hall)
• Help with Language barriers
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Optical Coherence Tomography (OCT)
IMPACT OF REDUCE UNNECESSARY REFERALS
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Impact of Increased Screening Intervals on Attendance
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THANK YOU FOR LISTENING
Tayside, Scotland