125. Emergency Ophthalmic Surgery Questions Flashcards
What is the preferred suture material for closing the muscle and fibrous layers in full-thickness eyelid lacerations? a) 3-0 Nylon b) 5-0 or 6-0 Polyglactin 910 c) 4-0 Polydioxanone d) 7-0 Polypropylene
b) 5-0 or 6-0 Polyglactin 910
The primary goal in treating eyelid lacerations is to: a) Remove necrotic tissue b) Prevent scar formation c) Achieve anatomic reapposition d) Promote granulation tissue
c) Achieve anatomic reapposition
The figure of eight suture technique is preferred for: a) Corneal laceration repair b) Nasolacrimal duct laceration c) Eyelid margin closure d) Third eyelid lacerations
c) Eyelid margin closure
Damage to the nasolacrimal puncta in medial canthal lacerations may lead to: a) Chronic epiphora b) Corneal ulceration c) Conjunctivitis d) Keratoconjunctivitis sicca
a) Chronic epiphora
The most common autograft used in corneal reconstruction in veterinary ophthalmology is: a) Lamellar keratoplasty b) Bulbar conjunctival graft c) Corneal allograft d) Biosynthetic graft
b) Bulbar conjunctival graft
The primary indication for performing a conjunctival pedicle graft is: a) Lens luxation b) Superficial corneal ulcer c) Deepening corneal ulcer d) Retinal detachment
c) Deepening corneal ulcer
When performing a rotational conjunctival pedicle graft, the incision begins: a) 2 mm proximal to the limbus b) 1 mm temporal to the limbus c) At the nasal limbus d) At the center of the ulcer
b) 1 mm temporal to the limbus
Which suture pattern is preferred for securing a corneal allograft? a) Cruciate b) Simple continuous c) Horizontal mattress d) Simple interrupted
d) Simple interrupted
The most common site of scleral rupture in dogs following blunt trauma is: a) The limbus b) The posterior pole c) The equator d) The optic nerve head
b) The posterior pole
Corneal foreign bodies are typically: a) Metallic fragments b) Organic plant material c) Synthetic fibers d) Bone splinters
b) Organic plant material
An anterior lens luxation is considered an emergency because it can lead to: a) Cataract formation b) Severe anterior uveitis c) Conjunctivitis d) Corneal dystrophy
b) Severe anterior uveitis
The optimal treatment for a proptosed eye with minimal extraocular muscle damage is: a) Enucleation b) Temporary tarsorrhaphy c) Orbital exenteration d) Topical corticosteroids
b) Temporary tarsorrhaphy
In cases of traumatic proptosis, which muscle is most commonly torn? a) Lateral rectus b) Medial rectus c) Dorsal oblique d) Ventral oblique
b) Medial rectus
During a temporary keratostomy, which gauge needle is typically used? a) 18 gauge b) 21 gauge c) 25 gauge d) 30 gauge
d) 30 gauge
Which of the following techniques is most commonly used for emergency extraction of a luxated lens? a) Cryoextraction b) Phacoemulsification c) Intracapsular cataract extraction d) Lens loop extraction
a) Cryoextraction
The preferred orientation for the conjunctival pedicle arm in relation to blinking action is: a) Horizontal b) Vertical c) Oblique d) Circular
b) Vertical
For corneal reconstruction, extracellular matrix grafts are typically derived from: a) Bovine skin b) Porcine small intestinal submucosa c) Equine pericardium d) Canine cartilage
b) Porcine small intestinal submucosa
The most important predictor of successful corneal allograft adherence is: a) The use of antibiotics b) Removal of the epithelium c) Size of the graft d) Suturing technique
b) Removal of the epithelium
What is the most common long-term complication following temporary tarsorrhaphy? a) Corneal ulceration b) Glaucoma c) Orbital cellulitis d) Retinal detachment
a) Corneal ulceration
A conjunctival graft should ideally be left in place for: a) 2-3 weeks b) 4-5 weeks c) 6-8 weeks d) 9-10 weeks
c) 6-8 weeks
Eyelid lacerations in dogs and cats generally heal poorly due to poor vascular supply. (True/False)
False
Conjunctival pedicle grafts maintain their own blood supply, which aids in corneal ulcer healing. (True/False)
True
In cases of traumatic proptosis, enucleation is always required. (True/False)
False
Anterior lens luxation is an emergency due to the risk of severe anterior uveitis. (True/False)
True
A figure of eight suture pattern is commonly used for securing a conjunctival graft. (True/False)
False
Damage to the nasolacrimal duct in medial canthal injuries can lead to chronic epiphora. (True/False)
True
Bulbar conjunctival grafts are only suitable for superficial corneal ulcers. (True/False)
False
A corneoconjunctival transposition can be used for axial lesions larger than 6 mm in diameter. (True/False)
False
Phacoemulsification is a technique used to remove a luxated lens. (True/False)
True
Corneal allografts can be stored in frozen conditions for months with no loss of endothelial cell viability. (True/False)
False
Iris tissue herniating through a corneal laceration should always be sutured back into the eye. (True/False)
False
Latanoprost is used to constrict the pupil and maintain the position of a luxated lens. (True/False)
True
Blunt trauma is more likely to cause posterior scleral ruptures in dogs than in cats. (True/False)
False
Conjunctival grafts should remain in place for 6 to 8 weeks to ensure proper incorporation. (True/False)
True
Temporary keratostomy involves inserting a 30 gauge needle to relieve intraocular pressure. (True/False)
True
Silicone stents used for nasolacrimal duct repair should remain in place for 6 to 8 weeks. (True/False)
False
Intraocular pressure must reach approximately 7000 mm Hg for scleral rupture to occur. (True/False)
True
A horizontal mattress suture pattern is preferred for closing corneal lacerations. (True/False)
False
Corneal endothelial damage is more likely with frozen allografts compared to fresh ones. (True/False)
True
Topical corticosteroids are contraindicated in cases of corneal ulceration. (True/False)
True
The optimal suture size for repairing conjunctival lacerations in small animals is: a) 3-0 b) 4-0 c) 5-0 d) 6-0
d) 6-0
What type of foreign bodies most commonly cause corneal perforation in dogs? a) Glass fragments b) Plant material c) Metallic splinters d) Plastic debris
b) Plant material
The most effective treatment for rapidly deepening corneal ulcers is: a) Topical antibiotics b) Conjunctival graft c) Corneal debridement d) Systemic corticosteroids
b) Conjunctival graft
The term ‘Gundersons graft’ refers to: a) A scleral graft b) A free skin graft c) A bulbar conjunctival graft d) A lamellar corneal graft
c) A bulbar conjunctival graft
In corneal reconstruction, which layer is primarily targeted to enhance tectonic stability? a) Epithelium b) Endothelium c) Stroma d) Descemet’s membrane
c) Stroma
What is the preferred suture pattern for closing deep corneal lacerations? a) Cruciate b) Horizontal mattress c) Simple continuous d) Simple interrupted
d) Simple interrupted
If iris tissue is herniated through a corneal laceration and contaminated, it should be: a) Sutured back in place b) Reduced into the eye c) Resected d) Left untreated
c) Resected
In a conjunctival pedicle graft, what is the purpose of dissecting Tenon’s capsule from the graft? a) Improve blood supply b) Reduce tension c) Increase graft thickness d) Facilitate suturing
b) Reduce tension
Which technique is used to remove a retro-third eyelid foreign body? a) Cryoextraction b) Lateral canthotomy c) Topical anesthetic and forceps d) Intravitreal injection
c) Topical anesthetic and forceps
Which of the following is NOT a typical indication for corneoconjunctival transposition? a) Superficial corneal ulcers b) Deep corneal ulcers c) Perforated corneas d) Axial lesions <5mm
a) Superficial corneal ulcers
What is the most significant complication associated with full-thickness corneal grafts? a) Persistent ulceration b) Corneal edema c) Conjunctivitis d) Lens damage
b) Corneal edema
Corneal endothelial cell death is commonly associated with: a) Fresh corneal grafts b) Freezing corneal tissue c) Lamellar keratoplasty d) Topical antibiotic therapy
b) Freezing corneal tissue
Which medication is commonly used to constrict the pupil and keep a posteriorly luxated lens in place? a) Timolol b) Latanoprost c) Atropine d) Pilocarpine
b) Latanoprost
Which procedure is typically performed for a luxated lens that cannot be surgically removed immediately? a) Lens repositioning b) Phacoemulsification c) Anterior chamber washout d) Enucleation
a) Lens repositioning
In traumatic proptosis, the most critical step in successful reduction is: a) Application of topical corticosteroids b) Identification and stabilization of eyelid margins c) Orbital decompression d) Use of systemic antibiotics
b) Identification and stabilization of eyelid margins
What technique is used to manage a large scleral rupture with macerated edges? a) Cryotherapy b) Phacoemulsification c) Scleral patch graft d) Air tamponade
c) Scleral patch graft
Which instrument is commonly used for blunt dissection of Tenons capsule during a pedicle graft? a) Scalpel b) Strabismus scissors c) Beaver blade d) Needle driver
b) Strabismus scissors
The ideal time frame for keeping a silicone stent in place when repairing nasolacrimal canaliculi is: a) 1-2 weeks b) 3-4 weeks c) 2-4 months d) 6 months
c) 2-4 months
After lens extraction, which procedure helps reduce the risk of retinal detachment? a) Intravitreal injection b) Anterior vitrectomy c) Posterior capsulotomy d) Scleral reinforcement
b) Anterior vitrectomy
Which of the following is an absolute contraindication for attempting to reduce a proptosed globe? a) Severe hyphema b) Lateral strabismus c) Complete loss of extraocular muscles d) Intact conjunctiva
c) Complete loss of extraocular muscles
