demographics and poag: time to consider …...demographics and poag: time to consider alternative...
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Demographics and POAG: Time to Consider Alternative Care ModelsDavid S. Friedman, MD, MPH, PhDDirector, Dana Center for Preventive OphthalmologyWilmer Eye Institute, Alfred Sommer Professor of OphthalmologyJohns Hopkins University School of MedicineProfessor, Department of International HealthJohns Hopkins Bloomberg School of Public HealthBaltimore, MD
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The Times They Are a Changin’
• Populations are aging
• Number of ophthalmologists is not adequate
• Cost of care is high and much of what we do during the care process is ineffective
• Technology is improving
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Developed countries are aging and there will be fewer working age individuals.
Who will see all of the glaucoma patients?
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German Population by Age – 2025
100+95-9990-9485-8980-8475-7970-7465-6960-6455-5950-5445-4940-4435-3930-3425-2920-2415-1910-14
5-90-4
AgeGroup
0 0.8 1.6 2.4 3.2 40.8 01.62.43.24
Male Female
Population (Millions) Population (Millions)
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United States Population by Age – 2025
100+95-9990-9485-8980-8475-7970-7465-6960-6455-5950-5445-4940-4435-3930-3425-2920-2415-1910-14
5-90-4
AgeGroup
0 3 6 9 12 153 0691215
Male Female
Population (Millions) Population (Millions)
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No New Ophthalmologists!!!
The number of ophthalmologists in the United States will increase by about 2% and
full time equivalents (FTE) will decrease over the next decade
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About 10% of Whites and over 15% of African-derived populations
over 75 years of age
Nearly 100 million globally with glaucoma in 2020
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Many More Need Monitoring
Patients Large numbers with angle closure
without glaucoma
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Quigley HA, et al. Ophthalmol. 2013;120(11):2249-2257.
Half of glaucoma care costs are for glaucoma visits
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Current management is inefficientand often ineffective
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2001
2007
Is This Ideal?
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Lots of Wasted Time and Effort
•Patient seen every 4 to 6 months
• IOP stable, field stable, nerve imaging stable
•5 years later confirmed field loss
How much of the time spent with the patient was time well spent???
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Visual Acuity
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Intraocular Pressure
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Anterior Chamber Angle
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Anterior Chamber Angle
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Fundus Photography
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Fundus Photography
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NFL Imaging
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Visual Field Testing
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Visual Field Testing
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What about counseling?
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Adherence in Clinic Patients
0.0 0.5 1.0
10
30
50
Adherence Rate(Electronic Monitoring, %)
Nu
mb
er
of
Pat
ien
ts
Okeke CO, et al. Ophthalmol. 2009;116(2):191-199.
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13 of 50 patients admitted to non-adherence in research interview
Physicians detected only 3 of them
Friedman DS, et al. Ophthalmol. 2009;116(12):2277-2285.
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Median weighted kappa for 5 clinicians = 0.32
Clinician ADefinitely
StableProbably
StableProbably
ProgressingDefinitely
Progressing
Definitely Stable 5 4 1 0
Probably Stable 4 1 2 1
Probably Progressing 0 3 1 3
Definitely Progressing 0 1 0 1
Clinician B
Viswanathan AC, et al. Br J Ophthalmol. 2003;87:726-730.
Determining Worsening???
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Technology can improve performance
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Photoscreening for DR
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Local Testing at Remote Locations
• Better integration of data
• More resources allocated to interpretation
• Physician with better data and more time to interact with those who need time
• Rapid upgrade to better technology over time
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A New Model of Care
• Testing using ancillary personnel for most visits
• Longer physician appointments when major clinical change is recommended
Health delivery systems can be improved in order to provide high quality care
more efficiently and effectively
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The Office of Tomorrow
• Data collected remotely
• Physician with multiple screens reviews
• Ancillary staff interact with the patient
• Longer visits with the doctor for change of care or change of status
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The Future Is Here
• Populations are aging and growing
• Resources are finite
• Physician supply is not growing, technology is improving
• All that remains is to figure out the logistics
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Recent Discoveries in the Pathophysiology of Glaucoma:Novel TreatmentsW. Daniel Stamer, PhDJoseph A. C. Wadsworth Professor of OphthalmologyProfessor of Biomedical EngineeringDuke UniversityDurham, NC
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Which Currently Available Glaucoma Medications Secondarily Target the Conventional Outflow Pathway?
• Prostaglandins (direct, but secondary to changes in uveoscleral outflow pathway)
• Pilocarpine (indirect, via ciliary muscle contraction)
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IOP= (F - U)/C + EVPSimplified Goldman Equation
C = 1/R
IOP, intraocular pressure;
F, rate of aqueous formation;
U, uveoscleral outflow;
C, facility of aqueous outflow;
EVP, episcleral venous pressure
Aqueous Humor Dynamics: IOP Regulation
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The AGIS Investigators. Am J Ophthalmol. 2000,Oct;130(4):429-440.
20.2 mmHg
16.9 mmHg
14.7 mmHg
12.3 mmHg
Vis
ion
Lo
ss(M
ean
Ch
ange
in V
isu
al F
ield
Def
ect
Sco
re)
Follow-up Time (Months)
The lower the pressure…
The better the outcome
Lowering Eye Pressure Is Neuroprotective
-2
0
2
-3
1
-1
0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96
3
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IOP = (F - U)/C + EVPSimplified Goldman Equation
Increase conventional outflowNone currently available in US
Decrease inflowß-adrenergic blockers
Carbonic anhydrase inhibitorsa2-adrenergic receptor agonists
Increase uveoscleral outflowProstaglandin F2a receptor agonists
How Do We Medically Lower Eye Pressure?
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Li T, et al. Ophthalmol. 2016;123(1):129-140.
Analysis of 114 Randomized Controlled TrialsEfficacy
Comparative Effectiveness of First-Line Medications for Primary Open-Angle Glaucoma: A Systematic Review and Network Meta-analysis
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
Rank 15
Rank 14
Rank 13
Rank 12
Rank 11
Rank 10
Rank 9
Rank 8
Rank 7
Rank 6
Rank 5
Rank 4
Rank 3
Rank 2
Rank 1
0 0 0 0 0 0 0 0 0 00.042
0.002 0.001 0.0010.353
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0 .05 .10 .15 .20 .25 .30 .35 .40 .45
80
70
60
50
40
30
20
10
0
Facility of Outflow, cu mm/min/mmHg
Higher Resistance to Conventional Outflow Causes Ocular Hypertension in Glaucoma
Grant WM. Trans Am Acad Ophthalmol Otolaryngol. 1951;55:774-781.
Lower ResistanceHigher
Resistance
Pre
ssu
re, m
mH
g
Untreated Glaucoma
Normal
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Why Do We Need a Conventional Outflow Drug?
• Majority of outflow (70%-90%) via conventional route, offering greater eye-pressure-lowering ability than PGAs
• Avoid interventional treatments (e.g. surgery, laser)
• Additive with current eye-pressure-lowering drugs: Current medical treatments do not lower eye pressure enough in most
• Restore function to conventional pathway
– Diseased tissue
– Better perfusion of tissues/cells
– Possible stimulation of cell division and repopulation/remodeling of tissue
– Dampen eye pressure fluctuations
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Conventional Outflow Drugs/Current Status
• Rho kinase inhibitors
– Netarsudil (Awaiting FDA approval in US)
– Netarsudil/latanoprost (Phase III)
– Ripasudil (Approved in Japan)
• Nitric oxide donors
– Latanoprostene bunod (Recently approved in US)
– Nipradilol (Approved in Japan)
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Latanoprostene Bunod: Mechanism of Action
corneal esterases
Increase uveoscleral outflow
Kawase K, et al. Adv Ther. 2016;33(9):1612-1627.
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Nitric Oxide Lowers IOP by Increasing Outflow Facility
Wizemann AJ, et al. Am J Ophthalmol. 1980;90(1):106-109. Chang JY, et al. Am J Physiol Cell Physiol. 2015;15:309(4)C205-C214.
Infusion
IOP,
%
100%
90%
80%
70%
60%
50%
40%
30%
20%
10%
0%
97 μg/min Nitroglycerin
Open-Angle Glaucoma(n = 5)
Narrow-Angle Glaucoma(n = 9)
0 30 60 90 120
Minutes
1.0
0.8
0.6
0.4
0.2
0.0
1.0
1.4SNAP (n = 6)
NAP (n = 5)
Y = 0.051x – 0.309R2 = 0.956
0 10 20 30
IOP, mmHg
Flo
w R
ate
, μ
L/m
in
*
*
**
**
Y = 0.031x – 0.198R2 = 0.965
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Rho Kinase Inhibitors: Mechanism of Action
Ren, et al. Invest Ophthalmol Vis Sci. 2016;57(14):6197-6209.
Relaxation
Human Eyes
-10%
80%
70%
60%
50%
40%
30%
20%
10%
0%
Pe
rce
nt
Ch
ange
in O
utf
low
Fac
ility
**
30 min 2 h 3 h
GPBS AR-13324m
MLC, myosin light chain.
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Netarsudil vs Latanoprost vs Netarsudil/Latanoprost(N = 292)
0.02% AR-13324 Netarsudil (n = 78)
0.01% PG324 Netarsudil/Latanoprost (n = 73)
Lewis RA, et al. Br J Ophthalmol. 2016;100(3):339-344.
Start Tx
mm
Hg
±SE
M
15
28
27
26
25
24
23
22
21
16
20
17
18
19
Pre-Study
8 AM
Qual 18 AM 10 AM 4 PM
Baseline
0.005% Latanoprost (n = 73)
0.02% PG324 Netarsudil/Latanoprost (n = 72)
8 AM 10 AM 4 PM
Day 88 AM 10 AM 4 PM
Day 158 AM 10 AM 4 PM
Day 298 AM
Day 30
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Mean Diurnal IOP Reduction
Lewis RA, et al. Br J Ophthalmol. 2016;100(3):339-344.
25.426.0
25.1 25.1
18.6 18.8
16.616.0
18.8 18.7
17.0
15.9
19.118.4
17.316.5
13141516171819202122232425262728
BaselineDay 8Day 15Day 29
IOP,
mm
Hg
±SE
M
0.02% AR-13324 Netarsudil(n = 78)
0.01% PG324 Netarsudil/Latanoprost
(n = 73)
0.005% Latanoprost (n = 73)
0.02% PG324 Netarsudil/Latanoprost
(n = 72)
+2 mmHg
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MERCURY 1, 12-Month Netarsudil/Latanoprostvs Individual Components (n = 718)
Source: http://investors.aeriepharma.com/events-and-presentations.
Netarsudil (n = 238)
Latanoprost (n = 236)
Netarsudil/Latanoprost (n = 244)
Start Tx
Pre-Study
8 AM
Qual1
8 AM 10 AM 4 PM
Baseline
mm
Hg
±SE
M
15
26
25
24
23
22
21
16
20
17
18
19
148 AM 10 AM 4 PM
Week 2
8 AM 10 AM 4 PM
Week 6
8 AM 10 AM 4 PM
Month 3
8 AM 10 AM 4 PM
Month 6
8 AM 10 AM 4 PM
Month 9
8 AM 10 AM 4 PM
Month 12
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22%
34%
48%
69%
80%
20%
36%
55%
70%
83%
39%
55%
76%
85%
92%
0%
20%
40%
60%
80%
100%
Source: http://investors.aeriepharma.com/events-and-presentations.
At Month 12: Percentage of Patients with IOP Reduced to 18 mmHg or Lower
Pat
ien
ts, %
*P<.05, **P<.01.
≤14 mmHg
IOP on Treatment
≤15 mmHg ≤16 mmHg ≤17 mmHg ≤18 mmHg
***
**
*
Netarsudil (n = 85)
Netarsudil/Latanoprost (n = 87)
Latanoprost (n = 106)
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Grade Image Description
0 None/Normal
1 Mild
2 Moderate
3 Severe
Adverse Events(≥5.0% in any group)
Netarsudil/Latanoprost
N = 238
Netarsudiln = 243
LatanoprostN = 237
Eye Related
Conjunctival Hyperemia 150 (63.0%) 125 (51.4%) 52 (21.9%)
Conjunctival Hemorrhage 31 (13.0%) 44 (18.1%) 3 (1.3%)
Cornea Verticillata 42 (17.6%) 33 (13.6%) 0
Eye Pruritus 27 (11.3%) 22 (9.1%) 3 (1.3%)
Punctate Keratitis 12 (5.0%) 18 (7.4%) 10 (4.2%)
Lacrimation Increased 17 (7.1%) 20 (8.2%) 1 (0.4%)
Visual Acuity Reduced 13 (5.5%) 13 (5.3%) 6 (2.5%)
Vision Blurred 11 (4.6%) 15 (6.2%) 3 (1.3%)
Blepharitis 14 (5.9%) 8 (3.3%) 5 (2.1%)
Administration Site Conditions
Instillation Site Pain 55 (23.1%) 60 (24.7%) 18 (7.6%)
12 Month Phase III Safety Profile of Netarsudil vs Latanoprost vs Netarsudil/Latanoprost
Source: http://investors.aeriepharma.com/events-and-presentations.
*70% scored as mild by biomicroscopy
*
*Reported as adverse events.
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Latanoprostene Bunod (LBN), Phase III Apollo Study
N=387
Weinreb RN, et al. Ophthalmol. 2016;123(5):965-973.
18.6
18.0 18.1
18.6
17.8 17.8
18.7
17.9 17.8
19.8
19.419.2
19.6
19.1 19.1
19.7
19.2 19.2
16
17
18
19
20
LBN 0.024% Timolol 0.5%
8 AM 12 PM 4 PM
Week 28 AM 12 PM 4 PM
Week 68 AM 12 PM 4 PM
Month 3
*
**
*
* *
*
* *
Me
an IO
P, m
mH
g
*P≤0.002 versus timolol at the same assessment point.
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-7.81-8.3
-9 -8.93
-7.77
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
*P=.005 vs latanoprost. †P =.009 vs latanoprost.
Weinreb RN, et al. Br J Ophthalmol. 2015;99:738-745.
+1.3
3-Month Latanoprostene Bunod, Voyager Phase III Trial (N = 396)
Re
du
ctio
n in
Me
an
Diu
rnal
IOP,
mm
Hg
†*Latanoprost
0.005%
Treatment Group
LBN0.040%
LBN0.024%
LBN0.012%
LBN0.006%
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Safety: 12-Month Latanoprostene Bunod Treatment in Japanese Subjects: The Jupiter Study
Kawase K, et al. Adv Ther. 2016;33(9):1612-1627.
Adverse EventsStudy Eye
(N = 130) n (%)Treated Fellow Eye
(N = 126) n (%)≥1 Ocular AE 76 (58.5) 78 (61.9)
≥1 Treatment-Related Ocular AE 62 (47.7) 61 (48.4)
Eye Disorders
Conjunctival Hyperemia* 23 (17.7) 21 (16.7)
Growth of Eyelashes 21 (16.2) 21 (16.7)
Eye Irritation 15 (11.5) 15 (11.9)
Eye Pain 13 (10.0) 13 (10.3)
Iris Hyperpigmentation 5 (3.8) 5 (4.0)
Blepharal Pigmentation 4 (3.1) 4 (3.2)
Blepharitis 3 (2.3) 3 (2.4)
Eye Pruritus 3 (2.3) 3 (2.4)
Asthenopia 3 (2.3) 2 (1.6)
Conjunctival Hemorrhage 2 (1.5) 3 (2.4)
Incidence of Ocular Treatment-Emergent Adverse Events Occurring in at Least 1% of Subjects in the Study Eye or the Treated Fellow Eye (Safety Population)
*Reported as adverse events.
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Disease Modification: Addressing the Major Contributors to Elevated IOP and Vision Loss
Progressive Degeneration of the Trabecular Meshwork Drives Elevated IOP and Vision Loss in Glaucoma
Fibrosis, StiffnessContraction
Healthy TM
Less Nutrients, Antioxidants
Cellular StressReduced Aqueous
Perfusion Area
Elevated IOP Vision Loss
Cellular Stress
• Aging
• Oxidation
Wang SK, et al. Clin Ophthalmol. 2014;9;8:883-890. He Y, et al. Clin Ophtalmol. 2008;58(11):3366-3376. Li G, et al. Eur J Pharmacol. 2016; Sept 15;787:2031.
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Outflow Drugs Have the Potential to Improve Health of TM in Patients With Glaucoma
Wang SK, et al. Clin Ophthalmol. 2014;9;8:883-890. He Y, et al. Clin Ophtalmol. 2008;58(11):3366-3376. Li G, et al. Eur J Pharmacol. 2016; Sept 15;787:2031.
Healthy TM
More Nutrients, Antioxidants
Less Cellular Stress
ReducedFibrosis, Stiffness
Contraction
Increased Aqueous Perfusion Area
Reduced IOP
+ drugs that decrease contractility
Preserve Vision
Cellular Stress
• Aging
• Oxidation
Reducing Fibrosis, Increasing Trabecular Outflow Could Stop Degeneration of Outflow Tissues in POAG
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Summary: Take Home Messages
• Conventional outflow dysfunction causes ocular hypertension
• Effectively lowering IOP preserves vision
• No medication currently available primarily targets the conventional outflow pathway
• One drug that relaxes the trabecular meshwork and increases conventional outflow may soon be available, and another was recently approved for patients
– Safe
– Efficacious (additive with current medications)
– Therapeutic potential Increase functionality of trabecular meshwork (i.e. ability to dampen IOP fluctuations)
Increase blood flow to optic nerve head (evidence of vascular dysfunction in some forms of glaucoma)
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Mechanisms of Pressure Relief in Glaucoma: Pharmacologic & Surgical Advances for Refractory POAG or Non-AdherenceSteven J. Gedde, MDJohn G. Clarkson Chair in OphthalmologyProfessor of OphthalmologyBascom Palmer Eye InstituteUniversity of Miami Health SystemMiami, FL
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Treatment Algorithm
*Up to 2-3 different drugs. Do not add a drug to a non-effective one; consider switching.
POAG, primary open-angle-glaucoma; XFG, exfoliative/pseudoexfoliative glaucoma; PDG, pigment dispersion glaucoma.
©European Glaucoma Society 2014.
Goniotomy or Trabeculotomy
Medical treatment is recommended during the
waiting time prior to surgery
No treatment
Consider:• Medical therapy options
on the basis of IOP values• Risk factors profileDiscuss with the patient
Congenital Glaucoma
Juvenile Glaucoma
POAG / XFG / PDGOcular
Hypertension
Surgery
Laser Trabeculoplasty
Medical Therapy*
If the above procedures not successful or feasible, consider repeat filtration surgery with anti-metabolites or long-tube drainage implant/cyclodestructive procedure
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• Traditional glaucoma surgery
– Trabeculectomy
– Aqueous shunts
– EX-PRESS® implant
• Nonpenetrating glaucoma surgery
– Deep sclerectomy
– Viscocanalostomy
– Canaloplasty
• Endoscopic cyclophotocoagulation(ECP)
• Minimally invasive glaucoma surgery (MIGS)
– Ab interno trabeculectomy (Trabectome®)
– Trabecular microbypass stent (iStent®)
– Gonioscopy-assisted transluminal trabeculotomy (GATT)
– Kahook Dual Blade
– CyPass® Micro-Stent
– XEN® Gel Stent
– Trab™360
Incisional Glaucoma Surgery
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Trabeculectomy
• Scleral fistula allows drainage of aqueous humor into subconjunctival space creating a filtering bleb
• Only titratable glaucoma procedure
• Success enhanced with use of antifibrotic agents (MMC, 5-FU)
• Growing concern about bleb-related complications (leaks, infection, dysesthesia)
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Surgical Trends
0
2000
4000
6000
8000
10000
12000
14000
0
10000
20000
30000
40000
50000
60000
70000
80000
1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009 2010 2011 2012
Trabeculectomy
Tube Shunt
Arora KS, et al. Ophthalmol. 2015;122:1615-1624.
Nu
mb
er
of
Pro
ced
ure
s
Year
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Aqueous Shunts
• Silicone tube shunts aqueous humor to end plate located in equatorial region of globe
• Design
– Valved: Ahmed, Krupin
– Nonvalved: Baerveldt, Molteno
• Traditionally used in eyes at high risk for filtration failure, but indications are expanding
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ABC/AVB Studies
Christakis PG, et al. Am J Ophthalmol. 2017;176:118-126.
Follow-up (Months)
Cu
mu
lati
ve P
rop
ort
ion
Fai
ling
1.0
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.8
0.9
0 6 12 18 24 30 36 42 48 54 60
P=.03
AhmedBaerveldt
Follow-up (Months)
Me
an IO
P, m
mH
g
40
30
25
20
15
10
5
35
0 6 12 18 24 36 48 60
Ahmed (n)
Baerveldt (n)
267 222 221 189 193 174 147 133
247 212 205 179 178 161 137 133
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TVT Study
P=.002
46.9%
29.8%
Gedde SJ, et al. Am J Ophthalmol. 2012;153:789-803.
0.4
0.2
0.0
0.6C
um
ula
tive
Pro
po
rtio
n F
ailin
g
0 12 24 36 48 60
Follow-up (Months)
Trabeculectomy Group
Tube Group
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PTVT Study
P=.013
17.3%
7.9%
0.2
0.1
0.0
0.3C
um
ula
tive
Pro
po
rtio
n F
ailin
g
0 3 6 9 12
Follow-up (Months)
Trabeculectomy Group
Tube Group
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EX-PRESS® Implant
• Nonvalved, stainless steel tube
• No sclerostomy or iridectomy required
• High rate of hypotony and extrusion prompted placement under a scleral flap
• Similar long-term safety and efficacy compared with trabeculectomy
Courtesy of Marlene Moster.
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XVT Study
Netland PA, et al. Am J Ophthalmol. 2014;157:433-440.
Pe
rce
nt
Succ
ess
Time (Months)
100
80
60
40
20
00 8 2412 184 20
P=.563
NE =NT =
59 59 5761 60 57
Trabeculectomy EX-PRESS®
0.0
0.4
0.6
0.8
0.2
0 6 12 18 24
Vis
ion
, lo
gMA
RTime (Months)
20
10
0
30
0 6 12 18 24
Me
an IO
P, m
mH
g
*
Time (Months)
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Nonpenetrating Glaucoma Surgery
• Excision of corneoscleral tissue under scleral flap leaves thin window of trabecular meshwork (TM) and Descemet’s membrane to provide resistance to aqueous outflow
• Reduces risk of hypotony
• Technically difficult
• Types:
– Deep sclerectomy
– Viscocanalostomy
– Canaloplasty
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Nonpenetrating Glaucoma Surgery
Chiselita D. Eye (Lond). 2001;15:197-201.
Follow-up (Months)
Cu
mu
lati
ve P
rop
ort
ion
of
Succ
ess 1.0
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
0.8
0.9
Follow-up (Months)
Intr
aocu
lar
Pre
ssu
re
Preoperative 1 2 3 12 180 2 4 6 8 10 12 14 16 20 2218
Trabeculectomy
Nonpenetratingdeep sclerectomy
30
26
22
20
18
14
12
28
24
16
6
Nonpenetratingdeep sclerectomy
Trabeculectomy
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Endoscopic Cyclophotocoagulation (ECP)
• Treatment of ciliary processes under direct visualization with endoscopic camera and laser
• Frequently combined with phaco
• Provides moderate long-term IOP reduction
• CME is most common cause of vision loss
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Minimally Invasive Glaucoma Surgery (MIGS)
• Newer group of glaucoma procedures characterized by:
– Ab interno approach
– Minimal trauma to tissue
– Modest efficacy
– Excellent safety profile
– Rapid postoperative recovery
• Frequently performed in combination with phaco
• Growing in popularity
Saheb H, et al. Curr Opin Ophthalmol. 2012;23:96-104.
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Ab Interno Trabeculectomy (Trabectome®)
• Electrocautery removes a strip of TM and Schlemm’s canal
• Meta-analysis
– 31% reduction in IOP
– 66% success rate at 2 years
• Prior laser trabeculoplasty and trabeculectomy does not appear to influence results
Kaplowitz K, et al. Br J Ophthalmol. 2016;100:594-600.Courtesy of Brian Francis.
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Ab Interno Trabeculectomy (Trabectome®)
Jea SY, et al. Ophthalmol. 2012;119:36-42.
P<.001
76.1%
22.4%
0.4
0.2
0.0
1.0C
um
ula
tive
Pro
bab
ility
of
Succ
ess
Follow-up (Months)
0.8
0.6
0 6 24 36 42 5448 603012 18
Trabeculectomy Group
Study Group
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Trabecular Micro-Bypass Stent (iStent®)
• Snorkel-shaped device made of heparin-coated titanium is inserted into Schlemm’s canal
• FDA-approved for use with CE in patients with mild-moderate glaucoma
• RCTs show greater reduction in IOP and medical therapy than phaco alone
• Multiple stents may provide greater IOP reduction than single stent
Postoperative (6 month)
Courtesy of Ike Ahmed.
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Samuelson TW, et al. Ophthalmol. 2011;118:459-467.
IOP ≤21 mmHg Without Meds
IOP Reduced ≥20% Without Meds
Trabecular Micro-Bypass Stent (iStent®)
% o
f P
atie
nts
100%
80%
60%
40%
20%
0%
Stent + Cataract Cataract Only
P=.003
Month1 3 6 12 LOCF
P<.001
% o
f P
atie
nts
100%
80%
60%
40%
20%
0%
Month1 3 6 12 LOCF
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CyPass® Micro-Stent
• Flexible 6.35 mm fenestrated micro-stent with internal lumen of 300 micron
• Inserted with a guidewire
• Shunts aqueous humor from the AC to the suprachoroidal space
• Pressure gradient drives flow through device
Courtesy of Ike Ahmed.
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**
CyPass® Micro-Stent
Vold S, et al. Ophthalmol. 2016;123:2103-2112.
IOP
↓ ≥
20
% v
s B
ase
line
(% o
f G
rou
p)
100
80
60
40
20
0
Time (Months)
2412
IOP
Re
du
ctio
n,
mm
Hg
***
Control Stent
66%
82%
60%
77%
Time (Months)
2412
*** ***
-6.2
-7.9
-5.4
-7.4
0
-1
-3
-6
-5
-9
-2
-4
-7
-8
**P<.01, ***P<.001.
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XEN® Gel Stent
• 6 mm tubular collagen implant placed translimbally
• 27-gauge needle inserter
• Drains aqueous into subconjunctival space
• High needling rate (32%-47%)
Courtesy of Joseph Panarelli.
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XEN® Gel Stent
Schlenker MB, et al. Ophthalmol. 2017;124(11):1579-1588.
Pro
po
rtio
n S
ucc
ess
ful
1.0
0.6
0.4
0.2
0.0
0.8
Months0 5 10 15 20 25 30
1.0
0.6
0.4
0.2
0.0
0.8
Months0 5 10 15 20 25 30
1.0
0.6
0.4
0.2
0.0
0.8
Months0 5 10 15 20 25 30
Qualified Success at IOP 6-14 Qualified Success at IOP 6-17 Qualified Success at IOP 6-21
Microstent
Trab
185 168 122 85 41 20 10
169 153 135 100 60 40 23
Trabeculectomy Microstent
185 168 123 86 41 20 10
169 153 137 101 62 41 24
185 168 125 87 42 20 10
169 154 137 102 62 41 26
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Gonioscopy-Assisted Transluminal Trabeculotomy (GATT)
• Microcatheter or suture used to perform 360° trabeculotomy
• Hyphema is most common complication
Courtesy of Davinder Grover.
GATT, gonioscopy-assisted transluminal trabeculotomy.
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Kahook Dual Blade
• Removal of TM using dual blade
• Single use ophthalmic blade
• Blade composition
– Pointed tip easily pierces TM
– Ramp elevates and stretches TM
– Dual blade excises strip of TM
– Foot plate prevents damage to collateral tissue
Courtesy of Malik Kahook.
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TRAB™360
• Cannula used to incise TM and introduce flexible trabeculotome 180°
• Filament is retracted back into device and procedure is repeated in other direction
• 360° goniotomy performed
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Investigational
• Translimbal implant
– InnFocus MicroShunt®
• Schlemm’s canal implants
– Hydrus™ Microstent
– iStent inject®
• Suprachoroidal shunts
– Gold Micro Shunt
– iStent Supra®
Courtesy of Len Pinchuk
Courtesy of Reay Brown.
Courtesy of Ike Ahmed.
Courtesy of Steven Vold.
Courtesy of Ike Ahmed.
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In Summary
•Surgical options for managing glaucoma are rapidly expanding
•Traditional glaucoma surgery (tubes and trabs) provide excellent IOP reduction, but surgical complications are common (generally transient and self-limited)
•MIGS are newer procedures that offer an improved safety profile, but reduced efficacy
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In the Pipeline: New Approaches to Drug Delivery for GlaucomaDavid S. Friedman, MD, MPH, PhDDirector, Dana Center for Preventive OphthalmologyWilmer Eye Institute, Alfred Sommer Professor of OphthalmologyJohns Hopkins University School of MedicineProfessor, Department of International HealthJohns Hopkins Bloomberg School of Public HealthBaltimore, MD
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Modest Advances in Medical Therapy: Largely Stagnant Over Last 20 Years
• Combination therapies
• Preservative free
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Adherence in Clinic Patients Monitored Electronically
Okeke CO, et al. Ophthalmol. 2009;116(2):191-199.
0.0 0.5 1.0
10
30
50
Adherence Rate(Percent of Drops Taken)
Nu
mb
er
of
Pat
ien
ts
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Drops Are Not Ideal
• Half of new scripts are not filled after 6 months, low adherence
• Administrative errors
• Local and systemic side effects
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Ideal Glaucoma Medical Treatment
• Patient-proof
• Few symptoms
• Can achieve the IOPs we need
• Cost effective
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Drug Delivery Through a Scleral Ring
• Ability to incorporate drugs into polymer
• Phase 2 trials completed
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Consistent Performance in Clinical Trials: Four Phase 1 (N = 73) and Four Phase 2 (N = 251)
• Uneventful safety profile• Regulatory pathway: NDA in 2019
• Topical, comfortable (90%), well-retained (90% at 6 months)
• One ring provides clinically significant IOP reduction for 6 months
• 85% of patient recommend insert• 80% of doctors prefer insert to drops
• Validated platform for fixed combination glaucoma, allergy, dry eye, other pipeline
Patient Acceptance
Durable Efficacy
Safety and Benefits
Market Value
Future
Goldberg I, et al. Poster presented at: World Glaucoma Congress; 2015 (Hong Kong).
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Mean Diurnal IOP with Bimatoprost Insert: Phase I Efficacy Results (N = 27)
• Mean IOP reduction: 4.7 to 6.5 mmHg from washout
Goldberg I, et al. Poster presented at: World Glaucoma Congress; 2015 (Hong Kong).
16.3
23.9
17.418.2
18.8 18.7 19.218.8
14
16
18
20
22
24
26
Screening Wash-out Week 2 Week 6 Week 12 Week 16 Month 5 Month 6
Diurnal Average
mm
Hg
(S.E
.)
5.1mmHg
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Scleral Ring Pros and Cons
• Comfort???
• Cosmesis???
• Medication can be placed by the patient (no physician involvement needed)
• Possible compliance issues
• Local side effects???
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Drug Delivery Into Suprachoroidal Space
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Ongoing Research
• Currently focused on macular edema and neovascular age-related macular degeneration
• One Phase I/II study completed
• Phase II and III studies on macular edema ongoing
• Injections every 12 weeks
• Planned research on delivery of glaucoma medicines using this technology
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Suprachoroidal Delivery Pros and Cons
• Likely to eliminate many local side effects
• Low drug requirement
• Harm to retina and choroid unknown???
• Dosing frequency may exceed visit frequency
• Patient acceptance of “injection” unknown
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Intracameral Injection of Printed Particles
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Intracameral Injection of Printed Particles: Early Development
• Current product includes printed travoprost
• Ongoing Phase II study
• Novel design: enrolling patients scheduled for phaco within 60 days
• Evidence of efficacy >6 months in dogs
Months
IOP,
mm
Hg
0
25
1 2 3 4 5 6 7 8
Baseline
Placebo
ENV51520
15
10
30% change from baseline
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Intracameral Delivery Pros and Cons
• Likely to eliminate many local side effects
• Evidence of long duration of action
• Possibility of infection, harm to cornea, other?
• Difficulty removing implant if side effects occur
• Patient acceptance of “injection” unknown
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Bioerodible Subconjunctival Implant
Two views and their delivery system
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Bioerodible Subconjunctival Implant
• Ongoing Phase I/II study
• Retinal products: duration of action as long as three years
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Bioerodible Subconjunctival Implant: Pros and Cons
• Potentially long duration of action
• Avoids intraocular injection
• Possibility of removing implant if side effects occur
• May still have normal drug side effects
• Patient acceptance of “injection” unknown
• Possible adverse effect on later glaucoma surgeries
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Bioerodible Tear Duct Plug
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Bioerodible Tear Duct Plug
• Phase III trial completed for dexamethasone implant after cataract extraction
• Completed Phase I study comparing travoprost plug vs timolol
• IOP lowering noted for 3 months with minimal side effects
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Bioerodible Tear Duct Plug: Pros and Cons
• Easy to insert
• Likely to be accepted by patients
• No possibility of removing implant if side effects occur
• May still have normal drug side effects, could fall out
• Dosing frequency may be > visit frequency
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Biodegradable Nanoparticles
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Subconjunctival Dorzolamide Particles LoweredIOP for 30 Days in Normotensive Rabbits
0 10 70
-4
0
4
Days Post-Treatment
IOP
Re
du
ctio
n, m
mH
g
20 30 40 50 60-6
2
2
* ** * * *
*
** *
* *
*
*Outliers more than 1.5x the interquartile range from the median.
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Welsbie DS, et al. Proc Natl Acad Sci USA. 2013;110(10):4045-4050.
Particles Potentially Useful for Delivering Neuroprotective Agents as Well
25
75
125
0
100
50
0 10 20 30 40 50 60 70 80 90
Dru
g R
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ase
, μg
Time (Days)
Tozasertib
150
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Medical Therapy Likely to Be a Rapidly Evolving Field
• Multiple new drug delivery platforms emerging
• Doctor and patient acceptance as well as business models will influence uptake
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