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Glaucoma, An Issue of Veterinary Clinics of North America: Small Animal Practice 45-6, E-Book

Glaucoma, An Issue of Veterinary Clinics of North America: Small Animal Practice 45-6, E-Book

Stefano Pizzirani

(2016)

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Book Details

Abstract

Dr. Stefano Pizzirani has assembled an expert panel of authors on the topic of small animal Glaucoma. Articles include: Functional anatomy of the outflow facilities,Epidemiology of idiopathic canine glaucoma,Pathophysiology and classification of idiopathic canine glaucoma,Genetics of idiopathic canine glaucoma,Clinical signs,Medical treatment of idiopathic canine glaucoma,Ocular pathology in canine glaucoma,Feline Glaucoma, and more!

Table of Contents

Section Title Page Action Price
Front Cover Cover
Glaucoma i
Copyright\r ii
Contributors iii
Editor iii
Authors iii
Contents v
Preface: Glaucoma\r v
Functional Anatomy of the Outflow Facilities\r v
Definition, Classification, and Pathophysiology of Canine Glaucoma\r v
Genetics of Canine Primary Glaucomas\r v
Clinical Signs and Diagnosis of the Canine Primary Glaucomas\r vi
Microscopic Lesions in Canine Eyes with Primary Glaucoma\r vi
Medical Treatment of Primary Canine Glaucoma\r vi
Surgical Treatment of Canine Glaucoma: Filtering and End-Stage Glaucoma Procedures\r vi
Surgical Treatment of Canine Glaucoma: Cyclodestructive Techniques\r vii
Feline Glaucoma\r vii
Canine Secondary Glaucomas\r vii
VETERINARY CLINICS OF\rNORTH AMERICA: SMALL\rANIMAL PRACTICE viii
FORTHCOMING ISSUES viii
January 2016 viii
March 2016 viii
May 2016 viii
RECENT ISSUES viii
September 2015 viii
July 2015 viii
May 2015 viii
VETERINARY CLINICS OF\rNORTH AMERICA: SMALL\rANIMAL PRACTICE\r viii
Preface: Glaucoma\r ix
Functional Anatomy of the Outflow Facilities 1101
Key points 1101
AQUEOUS PRODUCTION 1102
PATHWAYS OF AQUEOUS OUTFLOW 1104
TRABECULAR OUTFLOW 1104
ANGULAR AQUEOUS PLEXUS 1115
POSTERIOR, UVEOSCLERAL, OR UNCONVENTIONAL OUTFLOW 1117
SUMMARY 1119
REFERENCES 1120
Definition, Classification, and Pathophysiology of Canine Glaucoma 1127
Key points 1127
DEFINITION 1127
Age 1128
Gender 1130
Familial History 1130
Breed and Goniodysgenesis 1131
CLASSIFICATION OF GLAUCOMAS 1131
Congenital Glaucoma 1132
Primary Glaucoma 1133
Primary angle-closure glaucoma 1134
Primary open-angle glaucoma 1137
PATHOGENESIS AND PATHOPHYSIOLOGY OF PRIMARY GLAUCOMA 1137
Primary Angle-closure Glaucoma 1138
Primary Open-angle Glaucoma 1140
THEORIES AND MECHANISMS 1140
Mechanical Theory 1142
Vascular Theory 1142
Pathophysiologic Mechanisms 1143
Mitochondrial dysfunction 1143
Oxidative stress 1144
Activation of glial cells 1144
Glutamate 1145
Immune-mediated and autoimmune mechanisms 1145
SUMMARY 1148
ACKNOWLEDGMENTS 1148
REFERENCES 1148
Genetics of Canine Primary Glaucomas 1159
Key points 1159
INTRODUCTION 1159
TECHNIQUES USED TO STUDY GENETIC DISORDERS 1161
GENETICS OF HUMAN GLAUCOMA AND ITS RELEVANCE TO CANINE GLAUCOMA STUDIES 1165
GENETICS OF EXTRACELLULAR MATRIX ABNORMALITIES ASSOCIATED WITH PRIMARY GLAUCOMA 1165
GENETICS OF CANINE PRIMARY ANGLE-CLOSURE GLAUCOMA 1166
GENETICS OF PECTINATE LIGAMENT DYSPLASIA AND CILIARY CLEFT OPENING 1167
GENETICS OF PRIMARY OPEN-ANGLE GLAUCOMA 1168
GENETICS OF PRIMARY LENS LUXATION 1170
STRATEGIES TO TARGET PRIMARY GLAUCOMA IN CANINE POPULATIONS 1171
SUMMARY 1172
ACKNOWLEDGMENTS 1172
REFERENCES 1172
Clinical Signs and Diagnosis of the Canine Primary Glaucomas 1183
Key points 1183
DEFINITION OF PRIMARY GLAUCOMA 1183
PRIMARY OPEN ANGLE GLAUCOMA 1184
PRIMARY ANGLE CLOSURE GLAUCOMA 1185
Reverse Pupillary Block 1185
CLINICAL FORMS OF PRIMARY ANGLE CLOSURE GLAUCOMA 1189
Latent 1189
Intermittent 1190
Acute Congestive 1190
Post Congestive 1191
Chronic Primary Angle Closure Glaucoma 1191
CLINICAL SIGNS OF PRIMARY ANGLE CLOSURE GLAUCOMA 1191
EARLY TO MIDSTAGE CLINICAL SIGNS 1192
Pain 1192
Systemic Malaise 1192
Alterations in Vision 1192
Episcleral Injection 1192
Corneal Edema 1192
Mild Aqueous Flare and Cell 1193
Pupil Alterations 1193
Lens Changes 1193
Vitreous Alterations 1194
Retina 1194
Optic Disc Changes 1194
Changes in the Lateral Geniculate Nucleus and Visual Cortex 1195
CHRONIC CLINICAL SIGNS 1195
Haab Striae 1195
Buphthalmos 1195
Reduced Episcleral Injection 1196
Phthisis Bulbi 1196
DIAGNOSIS OF PRIMARY ANGLE CLOSURE GLAUCOMA 1196
TECHNIQUES THAT EVALUATE INTRAOCULAR PRESSURE 1196
Tonometry 1196
Indentation tonometry 1196
Applanation tonometry 1196
Rebound tonometry 1197
Tonometer factors 1197
Tonometrist-controlled factors 1198
Animal factors 1199
The Effect of Corneal Thickness on Intraocular Pressure Measurements 1199
TECHNIQUES THAT EVALUATE THE IRIDOCORNEAL ANGLE 1199
Gonioscopy 1199
Ultrasonography 1202
Anterior-Segment Optical Coherence Tomography 1203
TECHNIQUES THAT EVALUATE THE VISUAL CAPABILITIES OF THE EYE 1203
Visual Field 1203
Electrophysiologic Testing 1204
Multifocal electroretinogram/visual evoked potential 1204
TECHNIQUES THAT EVALUATE THE OPTIC DISC 1205
Optic Disc Photography 1205
Advanced Optic Disc Imaging 1205
Confocal Scanning Laser Ophthalmoscopy (Heidelberg Retina Tomograph) 1205
Optical Coherence Tomography 1206
Time-Domain Optical Coherence Tomography 1206
Spectral-Domain Optical Coherence Tomography 1206
TECHNIQUES THAT EVALUATE THE RETINAL NERVE FIBER LAYER 1207
Retinal Nerve Fiber Layer Photography 1207
Ophthalmoscopy 1209
Red-Free Photography 1209
Confocal Scanning Laser Ophthalmoscopy and Optical Coherence Tomography 1209
Scanning Laser Polarimetry 1209
REFERENCES 1209
Microscopic Lesions in Canine Eyes with Primary Glaucoma 1213
Key points 1213
INTRODUCTION 1213
GLAUCOMA-INDUCED CHANGES IN THE CANINE ANTERIOR SEGMENT 1214
Goniodysgenesis: Background and Nomenclature 1214
Histopathologic Diagnosis and Challenges 1217
Concurrent Lesions or Insights on Pathogenesis? 1219
Goniodysgenesis: Static or Progressive? 1223
GLAUCOMA-INDUCED CHANGES IN THE CANINE POSTERIOR SEGMENT 1223
General Microscopic Features of Primary Glaucoma in the Posterior Segment 1224
Microscopic Lesions of Early Primary Glaucoma: Atrophy of the Inner Retina 1224
Microscopic Lesions of Chronic Primary Glaucoma: Panretinal Atrophy, Optic Nerve Cupping, and Choroidal and Scleral Thinning 1225
Changes in the Choroid and Tapetum with Primary Glaucoma 1226
Photic Retinopathy or the So-Called Tapetal Sparing 1226
Changes in the Lens with Primary Glaucoma 1228
Changes in the Vitreous with Primary Glaucoma 1228
Changes in the Sclera with Primary Glaucoma 1229
SUMMARY 1229
REFERENCES 1230
Medical Treatment of Primary Canine Glaucoma 1235
Key points 1235
INTRODUCTION 1235
TOPICAL OCULAR HYPOTENSIVE DRUGS 1236
CHOLINERGIC AGONISTS (MIOTICS) 1237
Mechanism of Action 1237
Pilocarpine 1237
Surgical Treatment of Canine Glaucoma 1261
Key points 1261
INTRODUCTION 1261
FILTERING PROCEDURES 1262
GENERAL CONSIDERATIONS IN CURRENT GONIOIMPLANT DESIGN 1263
SUBCONJUNCTIVAL IMPLANTS 1264
Preparation 1264
Technique 1265
Postoperative Management 1268
Success Rate 1269
Combined Procedures 1269
FRONTAL SINUS SHUNTS 1269
SUPRACHOROIDAL SHUNTS 1270
INTRASCLERAL SHUNTS 1270
COMPLICATIONS 1271
END-STAGE GLAUCOMA PROCEDURES 1274
Chemical Ablation of the Ciliary Body 1275
SUMMARY 1276
ACKNOWLEDGMENTS 1276
REFERENCES 1277
Surgical Treatment of Canine Glaucoma 1283
Key points 1283
INTRODUCTION 1283
CYCLOPHOTOCOAGULATION 1284
DIODE TRANSSCLERAL CYCLOPHOTOCOAGULATION 1286
SURGICAL PROCEDURE 1286
POSTOPERATIVE MANAGEMENT 1288
SUCCESS RATE 1288
COMPLICATIONS 1289
ENDOSCOPIC CYCLOPHOTOCOAGULATION 1290
SURGICAL PROCEDURE 1290
SURGICAL APPROACH TO THE CILIARY PROCESSES 1292
Limbal Approach 1292
Pars Plana Approach (Pseudophakic, Aphakic) 1293
ENDOSCOPIC CYCLOPHOTOCOAGULATION TREATMENT AND TECHNIQUES 1294
POSTOPERATIVE MANAGEMENT 1299
SUCCESS RATE 1299
COMPLICATIONS 1301
SUMMARY 1301
SUPPLEMENTARY DATA 1302
REFERENCES 1302
Feline Glaucoma 1307
Key points 1307
AQUEOUS HUMOR DYNAMICS IN CATS 1307
EPIDEMIOLOGY AND CAUSES OF GLAUCOMA IN CATS 1307
PRIMARY GLAUCOMA IN CATS 1310
Feline Open Angle Glaucoma 1310
Feline Congenital Glaucoma 1310
SECONDARY GLAUCOMA IN CATS 1312
Glaucoma Secondary to Neoplasia 1312
Glaucoma Secondary to Uveitis 1312
Trauma 1313
Intraocular Hemorrhage 1314
Lens-Associated Secondary Glaucoma in Cats 1314
Feline Aqueous Humor Misdirection Syndrome 1314
CLINICAL SIGNS AND DIAGNOSIS OF FELINE GLAUCOMA 1316
Measuring Intraocular Pressure in Cats 1319
Fluctuations in Intraocular Pressure Should Be Expected, Even in Normal Cats 1319
The Age of the Patient Can Influence Intraocular Pressure 1319
Prior Drug Administration May Alter Intraocular Pressure 1319
Tonometers Provide Only an Estimate of Intraocular Pressure and Have Important Limitations 1319
Gonioscopy 1321
Ancillary Diagnostic Tests 1321
CLINICAL MANAGEMENT OF GLAUCOMA IN CATS 1322
MEDICAL THERAPY FOR FELINE GLAUCOMA 1323
INTRAOCULAR PRESSURE–LOWERING DRUGS 1323
Carbonic Anhydrase Inhibitors 1325
DRUGS WITH VARIABLE RESPONSE 1325
β-Blockers 1325
Prostaglandin Analogues 1325
Cholinergics 1326
Adrenergic Agonists 1326
Topical Corticosteroids in Feline Glaucoma 1327
SURGICAL MANAGEMENT OF GLAUCOMA IN CATS 1327
Cyclodestructive Procedures 1327
Anterior Chamber Shunt Procedures 1328
Pharmacologic Ablation of the Ciliary Body Epithelium 1328
ENUCLEATION AND EVISCERATION FOR FELINE GLAUCOMA 1328
REFERENCES 1329
Canine Secondary Glaucomas 1335
Key points 1335
UVEITIS 1338
Key Findings 1338
Pathogenesis 1338
Additional Diagnostics 1339
Treatment 1340
Prognosis 1341
CATARACTS AND CATARACT SURGERY 1341
Key Findings 1341
Pathogenesis 1341
Additional Diagnostics 1344
Treatment 1344
Prognosis 1344
LENS INSTABILITY AND LENS LUXATION 1344
Key Findings 1345
Pathogenesis 1345
Additional Diagnostics 1346
Treatment 1346
Prognosis 1347
NEOPLASIA 1347
Key Findings 1348
Pathogenesis 1348
Additional Diagnostics 1348
Treatment 1349
Prognosis 1349
HYPHEMA 1350
Key Findings 1350
Pathogenesis 1350
Additional Diagnostics 1350
Treatment 1351
Prognosis 1351
RETINAL DETACHMENTS 1351
Key Findings 1352
Pathogenesis 1352
Additional Diagnostics 1353
Treatment 1353
Prognosis 1353
PENETRATING AND BLUNT TRAUMA 1353
Angle Recession Glaucoma 1354
Penetrating Trauma with Lens Damage 1354
SPECIFIC IMMUNE-MEDIATED AND/OR PIGMENT-MEDIATED DISEASES 1354
Melanocytic Glaucoma/Pigmentary Glaucoma/Ocular Melanosis 1354
Golden Retriever Uveitis-related/Cyst-related Glaucomas 1355
Uveodermatologic Syndrome/Vogt-Koyanagi-Harada–like Syndrome 1356
REFERENCES 1357
Index 1365