Glaucoma: Angle Closure Glaucoma Flashcards
- Primary Angle Closure Glaucoma
a. % of all Diagnosed Cases of Glaucoma?
b. Why is the IOP Elevated? - Acute Attack of ACG can lead to Blindness when?
a. NFL damage w/in how many hours? - POAG: Aq. has access to what?
a. But Drainage is impaired due to what?
b. Loss of Ganglion Cells/Vision is what?
- a. 10%
b. Cuz PERIPHERAL IRIS PREVENTS Aqueous from reaching the TM! (Meshwork is presumed to function normally) - w/in Hours or Days
a. W/in 48 hrs - to the TM
a. due to other Mechanisms
b. Chronic, Slow and Gradual Loss of Ganglion Cells/Vision
Epidemiology/Risk Factors
- Race: More common in what patient populations?
- Family History?
- Gender?
- Age?
- What else?
- Mongoloid Populations (Eskimos, Eastern Asians…Asians)
- Positive is a RISK FACTOR
- WOMEN
- Increases (lens thickness, increasing Anterior Lens Curvature, Slight anterior displacement of the lens, pupillary miosis)
- REFRACTIVE ERROR: More Frequently in HYPEROPIC EYES (generally smaller gloved: Gonio should be done on Patients w/Refractive Error of more than +2.50)
Classification of Angle Closure Glaucomas
- ACG w/PUPIL Block
a. What is Restricted?
b. Block can lead to what?
2 ACG w/o PUPIL BLOCK
a. PLATEAU IRIS: What is it?
b. Secondary Forms are what?
- a. Normal flow of Aq. from the Post Chamber to the AC is restricted
b. to increased pressure in the Post. Chamber which pushes the Peripheral Iris Forward (IRIS BOMBE) until it blocks the TM - a. a configuration of the IRIS: Central ANTERIOR CHAMBER DEPTH is NORMAL, IRIS PLANE is FLAT, and ANTERIOR CHAMBER Angle is Extremely Narrow
b. Defines as mechanisms which cause either a pulling or pushing of the iris against the TM!!
Angle Closure Glaucoma w/Pupillary Block
- Primary: (4)
- Secondary (5)
- a. Acute, Chronic, Subacute, and Suspect
2. Ectopia Lentis; Nanophthalmos; Phacomorphic; Posterior Synechiae to the lens or vitreous or IOL, and Spherophakia
Angle Closure Glaucoma w/o Pupillary Block
- Primary (Plateau Iris) (2)
- Secondary (Anterior “pulling” mechanism) (4)
- a. Plateau Iris Configuration
b. Plateau Iris Syndrome - a. Epithelial Downgrowth
b. ICE Syndrome
c. Inflammatory Induced (PAS)
d. Neovascular Glaucoma
Angle Closure Glaucoma w/o Pupillary Block (2)
- Secondary (Posterior “PUSHING” Mechanism) (Malignant Glaucomas & Related Causes) (8)
- Choroidal Detachment
- CB Detachment
- Intraocular Tumors
- Lens Induced
- Post Scleral-buckle for RD procedure
- Post Intravitreal Air Injection
- Post Pan-Retinal Photocoagulation Procedure for Diabetic Retinopathy
- Retinopathy of Prematurity
Angle Closure Glaucoma
- Role of the CHOROID
a. Why does it likely contribute to developing ACG?
b. 20% Expansion =? - What causes Choroidal Expansion?
- Due to Choroidal Expansion (increased VOLUME)
b. takes up to 96 ul (normal AC = 100ul) - Changes in Choroidal Vessel Permeability
Angle Closure Glaucoma
- Factors Affecting ACG (Many)
- Carotid Cavernous Sinus Fistula
- Choroidal Detachment
- Choroidal Tumors
- Drug Induced Choroidal Effusions (Sulfa Based)
- Extensive PRP
- Hypotony
- Scleritis
- Suprachoroidal Hemorrhage
- Acute Central Retinal Vein Occlusion
Medications Causing ACG
- Only one HIGHLIGHTED?
- TOPAMAX (topiramte)
Primary ACG w/Pupillary Block: Mechanisms
- You get Apposition of what?
- Absent EGRESS of what?
- What does this Cause?
- This LEADS to what occurring?
- And finally: what happens?
a. Can create formation of what? - IOP?
a. What could happen due to increased IOP?
b. What happens w/in 24 hrs?
- Irido-Lenticular Apposition
- Absent Egress of Aq. into the AC
- Pressure increase in the Posterior Chamber
- Leads to IRIS BOMBE (forward bowing of Iris due to Posterior pressure)
- Angle Closure
a. PAS formation if contact remains too long - Rises to >40mmHg!
a. Maybe a CRAO or CRVO due to elevated IOP
b. RNFL Damage as tissue can’t adapt to sudden pressure increase
ACG: Differential Diagnosis
- 7
- Angle Mass
- Early Neo Glaucoma
- Glaucomatocyclitic Crisis
- ICE
- Malignant Glaucoma
- Plateau Iris Syndrome
- POAG w/unusually High IOP
Glaucomatocyclitic Crisis
- AKA?
a. What is it?
b. It’s Associated with what?
c. Gonioscopy shows Open/Closed Angle - Tx?
- Bottom Line: These Patients look like what?
- Posner-Schlossman Syndrome
a. Recurrent episodes: Mild, Idiopathic, UNILATERAL, Non-Granulomatous Anterior UVEITIS
b. MARKED ELEVATION in IOP (usually in 20-50 y/o)
- STEROIDS for UVEITIS (usually reduces the IOP)
a. If IOP stays elevated, then do a short course of Anti-Glaucoma Meds - They look like ACG patients. Do a thorough Gonio and SLE
Common Signs, Symptoms and Complications
- Acute Primary ACG
a. Classic Signs?
b. It is almost ALWAYS UNI/BI?
c. Development of Pain and Symptoms is RAPID/SLOW?
d. Pain is related to what?
- EMERGENCY!!
a. Redness, Pain (mild to severe), BLURRED VISION, Haloes, Tearing, Photophobia, Nausea and vomiting, Headache, IOP (HIGH 40-90 mmHg), Mid Dilated Pupil!
b. UNILATERAL!
c. RAPID!
d. rapid rise in Pressure more than the actual IOP itself
Common Signs, Symptoms and Complications
- Subacute Primary ACG
a. What kind of Angle Closure occurs?
b. How does it resolve?
c. Symptoms? (based on what 2 things)
d. Subacute Attacks tend to Increase/Decrease over time and may progress to one of 2 things?
2. What should we do with these patients?
3. When is the Patient at MOST RISK? (what sign do we look FOR?!)
- a. INCOMPLETE Angle Closure
b. Spontaneously
c. Vary widely: Depends on IOP and Pt’s Pain Threshold
d. Chronic Primary ACG or have an ACUTE Angle Closure Attack
2. Monitor for Signs of Previous Angle Closure
3. Mid-Dilated Pupil
Signs of Prior Angle Closure Attacks
- Synechiae: What 2 types?
- Glaukomflecken: What is it?
- What about the Iris?
- Pigment ANTERIOR to what Line?
- Glaucomatous Findings (what 2?)
- PAS and Posterior
- Anterior Subcapsular Lens
- Iris ATROPHY
- to Schwalbe’s Line
- Optic Nerve and Visual Field Changes
Common Signs, Symptoms and Complications
- Chronic Primary ACG
a. Permanent Closure of PARTS of the ANTERIOR CHAMBER ANGLE by what?
b. Closure of the Entire Angle may progress VERY SLOWLY and the patient may not experience symptoms until when?
- a. by PAS
b. until LATE in the DISEASE!
Primary ACG: Symptoms Summary
- Acute: (2)
- Sub-Acute (2)
- Chronic: (2)
- a. SYMPTOMATIC
b. Measurable INCREASE in IOP - a. No Symptoms to Mild Symptoms
b. IOP probably normal in office. - a. Typically Asymptomatic
b. IOP usually Elevated
Primary ACG Exam Components
- Pupils: If IOP is >40 mmHg, the Iris Sphincter will be what?
- What 5 things should be done?
- FIXED
- a. SLE
b. Applanation IOP
c. Van Herick Angle Estimation
d. AC Depth Evaluation
e. Gonio: Indentation