Download - Endophthalmitis ppt by dr mazhar
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DR MAZHAR ALI PANHWERCIVIL HOSPITAL KARACHI
Endophthalmitis Etiology, classification and clinical approach
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DEFINITION
Intraocular inflammation involving ocular cavities(vitreous cavity and /or anterior chamber) & their adjacent structures which is either infectious or non – infectious .
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CLASSIFICATION
Endophthalmitis can be classified according to the
• Infectivity – Infective / non infective ( sterile)
• Mode of entry – exogenous / endogenous
• Type of etiological agent
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Classification
Infectious Sterile (Infectivity)
Exogenous Endogenous ( Mode of entry)
Post –trauma Post-operative Blebitis(PEI-IOFB)
Fulminant Acute Chronic
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Cont.
Etiological agent
5
Bacterial Fungal viral Parasitic
Endophthalmitis
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Gram positive bacteria 75%-85%
Gram negative bacteria 10%-15%
Fungi3%
Staphylococcus epidemidis (43%)
Pseudomonas (8%) Aspergillus
Streptococcus spp (20%)
Proteus (5%) Fusarium
Staphylococcus aureus (15%)
Haemophilus influenzae (1%)
Cephalosporium spp.
Propionibacterium acnes
Klebsiella( 0-1%)
Bacillus cereus (1%) Coliform spp (0-1%)
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Exogenous Endophthalmitis
Vitreous and aqueous – primary site of involvement
Retina and uvea –secondary involvement
Basically 3 types 1) post operative 2) post traumatic 3) Blebitis
Source of infection is from exteriorMaily bacterial
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1)Post-op Endophthalmitis
Surgery Bascom Palmer Eye Institute (1984-1994)
Katten et al(1984-1989)
ECCE with and without PCIOL
0.08% 0.072%
Secondary PCIOL 0.37% 0.3%
PPV 0.05% 0.05%
PK 0.18% 0.11%
Glaucoma filtration surgery
0.12% 0.06%
Incidence: 0.05%MC among all types: 49-76%
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Source of infection
Airborne respiratory origin, air condition in O.T Solution and medications irrigating solutions, drops and ointment skin antiseptic, viscoelastic and silicon oilTissue periocular skin ,lid margin and lashes conjuctival sac, Lacrimal sac nasal mucosa, corneal graftObjects and materials surgical instruments, gloves, masks, IOL
Clinical Importance- all causes are preventable
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Risk Factors
Preoperative risk factors blepharitis , active conjunctivitis Lacrimal drainage system infection or
obstruction , contaminated eye drops.
Operative risk factors wound abnormalities, PC rent ,vitreous
loss ,prolonged surgery & contaminated irrigation solutions
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Types Of Presentations
Fulminant Acute Chronic
(<4 days) (4-7days) (>4 weeks) -gram –ve -staph.epidermidis -staph.aureus -coag.-ve cocci -streptococci delayed delayed entry onset bleb P.acne related fungi
S.epidermids
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2)Post traumatic
Incidence-2-7%(unsterile conditions & contaminated objects)Contributes to 17-40% of all casesPenetrating ocular trauma is main culpritCausative organisms fulminant: acute: chronic: B. cereus S.epidermidis(MC) fungi: Streptococcus Gram.-ve fusarium
Bacillus cerus isolated in 50% of culture positive cases causes fulminante Endophthalmitis
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Difficult to diagnose early.
Rapid worsening of symptoms and inflammation should be suspected as Endophthalmitis until proved otherwise.
Ring corneal infiltrate & ring abscess is typical of Bacillus. also assoc.with proptosis,chemosis & severe orbital pain in 24hrs
Commoner in rural setting due to retained IOFB.
Removal of IOFB with in 24 hr.reduces risk.
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3)Bleb related endophthalmitis
4-18% of all casesAfter glaucoma filtration surgeryMay occur at any time (months- years )after surgeryMost of the time through intact bleb via conjuctival floraPoor prognosis as org. are more virulentCausative organism streptococci(MC)-faecalis,viridans,pneumoniae H.influenzae staph. are rareClinical signs infected white bleb Vitritis Hypopyon
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Risk factors: use of antimitotic agents,inferior blebs,conjunctivitis,contact lens,periocular infections
Should be differentiated from BLEBITISBlebitis - low virulence organism - mild intraocular inflammation - no Vitritis
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Endogenous(Metastatic) Endophthalmitis
2-15% of all casesHematogenous spread of organism from distant source Retina and choroid primarily involved due to high
vascularity.Fungi> bacteria Candida(MC)>AspergillusPredisposing factors - Diabetes - immunosuppresion(AIDS,malignancies medications) - recent major abdominal surgery - prolong indwelling catheter ( intravenous , TPN) - intravenous drug abuser - distant infection ( endocarditis, meningitis, septicemia
etc)no structural defect in globe
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Clinical Approach
Symptoms: Decreased or blurred vision ( sudden / severe – acute) ( slowly / mild—chronic)Pain Photophobia Redness of eyes Swollen eyelids Discharge White lesion in black part of the eyeFloatersFever
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Signs
Initial visual acuity ( prognostic significance)Ocular motility ( sign of orbital inflammation)Eyelid swollen , blepharospasm Conjunctiva hyperemia, chemosis, bleb examination if presentCornea edematous, opacification , DM folds keratic precipitate, infiltrates, occult penetrationAnterior chamber cells, flare , fibrinous exudates and HypopyonIris – muddy,boggy,resistant to dilatation,post.synechiae
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Pupil-absent or sluggish reaction to lightLens - Membrane , exudates around IOLVitreous - Vitritis , exudates , yellowish appearance Fundus examination Absent red reflex and no fundal view Papilitis White lesion in retina and chorioid Retinal hemorrhage and periphlebitisIOP- usually low,may be high in early casesSigns of penetrating injury and Intraocular foreign
bodyWound dehiscence
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Fungal Endophthalmitis
Caused by – Candida albicans, Aspergillus, Fusarium etc.
Causes - delayed post-operative endophthalmitis - endogenous endophthalmitis in
immunocompromised patients
Minimal pain, mild external ocular involvement
Progressive iridocyclitis, Vitritis ( string of pearl )
Yellow white choroidal lesion single or multiple
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Diagnosis
A) Clinically B) Laboratory AC Tap (0.1ml) Vitreous tap (0.2 ml) Standard Media
Gram’s stain Blood agar ( most aerobic bacteria)
Giemsa stain Chocolate (aerobic , Neisssseria ,
Haemophilus ) Culture Thioglycolate broth ( aerobic ,anaerobic
bacteria) SDA ( fungi) Specialized Media Lowenstein –Jensen ( mycobacterium ,
nocardia) Non- nutrient agar E.coli enriched PCR
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1) Ultrasound-vitreous membrane and opacities anatomical status of the retina extent of inflammation choroidal detachment IOFB presence and localization retained lens material
2) CT Scan – not much useful to detect IOFB3) ERG grossly abnormal - poor prognosis slightly subnormal - slight better
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For endogenous endoph.:Complete blood count ( signs of infection)ESR ( malignancy ,chronic infections, rheumatic
diseases)Cultures ( for detection of source of infection) blood culture urine culture throat swab CSF stool indwelling catheter’s tipChest X-rayOther like HIV
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Treatment
GOALS
1) Retention of useful vision.
2) Minimize the infection with antimicrobial agents.
3) Limit the inflammation.
4) Symptomatic relief.
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For bacterial endoph.
Prompt therapy is critical Modalities
MEDICAL 1) Antibiotics Intravitreal, periocular, topical , systemic 2) Anti-inflammatory (steroids) topical ,periocular , systemic ( not for chronic Endophthalmitis) 3) Supportive – Cycloplegic,AGM
SURGICAL vitrectomy
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Medical treatment
Intravitreal injection - preferred route in all types of endophthalmitis. - direct administration in vitreous - by passes Blood Ocular Barrier. Intravitreal injection
Vancomycin ( 1.0 mg in 0.1 ml ) Amikacin ( 400ug in 0.1 ml) Or Ceftazidime (2.25mg/0.1ml)
Subconjunctival injections Vancomycin (25mg in 0.5ml) Amikacin (25mg in 0.5ml)
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Systemic : 1) penetrating ocular injury from contaminated objects.
2) Endogenous bacterial endophthalmitis. For Post-Op Endophthalmitis: - no role due to MIC in vitreous -Quinolones ( ciprofloxacin) can be tried
Rapid bacterial proliferation make even the Quinolones concentration inadequate to prevent the growth of organisms.
Ideal duration - at least 2-4 week
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Drugs DosesVancomycin 1 gm iv.12 hrly
(10-30 mg/kg)Ceftazidime 2 gm iv. Bd
Amikacin 250 mg iv. Tid(15mg/kg)
Gentamycin 80 mg iv tid (3-5mg/kg)
Ciprofloxacin 750 mg po.bd
Ofloxacin 200 mg 12 hrly
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Role Of Steroids
Indications recent onset after rule out of fungus.Contraindication Late onset endophthalmitis fungal endophthalmitisMechanism- reduce inflammation clinically and
histopathologicaly
limit ocular damage
Routes - Intravitreal(dexa400mgm in 0.1ml),systemic, sub-conjuctival(1 mg in 0.25ml), topical
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Treatment in Fungal Endoph.
Indication of Intravitreal antifungal 1) pre-existing fungal keratitis endophthalmitis 2) fungal endogenous endophthalmitis ( culture +)
Commonly used medications intra-vitreal Amphotericin B- 5microgm/0.1ml oral fluconazole / ketoconazole ( better vitreal penetration)
Voriconazole Intravitreal -50 microgm/0.1ml oral- 200 mg bd intravenous- 6 mg/kg bd 2 doses
Steroids in any form C/I
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Systemic antifungals
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Vitrectomy
Advantages ( DIAGNOSTIC / THERAPEUTIC) 1) more material for culture esp. fungus.
2) removal of inflammatory mediators /organisms /toxins.
3) removal of source of infection.
4) better dispersion of antibiotics in the vitreous.5) clears the media and better posterior segment visualization
6) removes vitreous membrane which may be a source of late traction and subsequent detachment.
guided by Endophthalmitis vitrectomy study (EVS)
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Complications
Retinal necrosis Retinal detachment
Retinal necrosis Vitreous tap Vitrectomy
Increased intraocular pressure Retinal vascular occlusion Optic neuropathy Panophthalmitis Hypotony
Ciliary body shut down Leaking wound Retinal detachment Cyclodialysis cleft Medication
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Prevention
1 ) PRE-OPERATIVE a) preexisting conditions e.g.blepharitis, conjunctivitis ,
dacryocyctitis,, infected contra- lateral socket
b) povidone iodine ( BETADINE) drops
c) meticulous draping
d) topical antibiotic 2) INTRA-OPERATIVE irrigation of A/C with vancomycin3) POST –OPERTAIVE anterior sub-tenon antibiotic / sub conj. antibiotic
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Bleb related 1) early diagnosis and treatment of conjunctivitis. 2) wearing of contact lens should be discouraged. 3) treatment of associated periocular infections.Traumatic 1) safety goggles. 2) timely and appropriate management of ocular
trauma.Endogenous 1) adequate and timely management of systemic
illness. 2) intravenous drug abuse reduction. 3) control of all predisposing factors.
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THANK YOU
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Endophthalmitis Vitrectomy Study(EVS)
Multicenter randomized trial carried out at 24 centres in U.S. (1990-1994)
Purpose : To determine The role of IV antibiotics in the management of
POERole of initial vitrectomy in management.Patients : N = 420 patients having clinical evidence
of POE within 6 weeks of cataract surgeryInterventionRandom assignment to immediate vitrectomy (VIT)
or vitreous biopsy (TAP). They were also randomly assigned to treatment with IV or no IV.
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Study medications : After initial VIT or TAP, all patients received I/V injection of amikacin (0.4 mg) + vanco(1 mg)
Vanco(25 mg in 0.5 ml), Ceftazidime (100 mg in 0.5 ml),
Dexamethasone (6 mg in 0.25 ml) administered subconjunctivally.
IV treatment: ceftazidime (2 g every 8 hrs) + amikacin (6mg/kg every 12 hrs) for 5-10 days
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Main outcome measuresEvaluation of visual acuity and clarity of ocular
media at 3, 9, 12 monthsNo difference in outcome between PPV followed by
I/V group compared to vitreous tap and I/V if vision better than light perception
No difference in final visual acuity or media clarity whether or not EVS systemic antibiotic( Amikacin , Ceftazidime) were employed
Vision with light perception or worse ,much better results in immediate PPV
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Limitations of EVS 1) only for acute post -operative
endophthalmitis after cataract surgery
2) doesn’t mention the outcome of vitrectomy in other forms of endophthalmitis like;
- post –traumatic -chronic post operative etc -endogenous endophthalmitis